Partitioning a Hardware RAID

OK, I have already searched the net to no avail, im hoping someone here will be able to help me.
I currently have an external 300gb HD with 2 partitions, one is a bootable backup and the other is storage. I have recently realized that if this drive were to fail I would lose a ton of important data. I therefore have decided to create a raid setup. I am considering purchasing a Buffalo DriveStation Duo with 2 500GB drives in it. I would set this up in a RAID 1 array so I will have 500gb of usable space with a constant mirror image backup. My question is, can I partion the RAID into 2 partitions (as I have now with my 300 gb drive) one for a bootable backup and one for storage and still maintain the mirroring. In essence I want to have 1 drive with 2 partitions on it, and have the drive still be mirrored to the second drive.
First-Is this possible?
Second-Will I still be able to boot from the boot partition?
Three-If so, can having more than one partition on a raid create problems, such as increased disk failure, slower speeds, etc?
Thanks in advance to anyone that can help me with this!

I'd say you want separate partitions for atleast /, /usr,/opt, and /var. Probably one for /home, too. I'd definately isolate the filessytem where all of the work will occur onto it's own partition to reduce fragmentation on the others.

Similar Messages

HT204053 hi i want to use find my mac but i got this massage (some configurations, such as software or hardware RAID,do not support a recovery partition and can't be used with find my mac)

hi i want to use find my mac but i got this massage (some configurations, such as software or hardware RAID,do not support a recovery partition and can't be used with find my mac)

hi i want to use find my mac but i got this massage (some configurations, such as software or hardware RAID,do not support a recovery partition and can't be used with find my mac)

Some configurations such as a software or hardware RAID do not support a recovery partition and can't be used with Find My Mac.

I'm getting the following error message when attempting to invoke "Find My Mac"
Some configurations such as a software or hardware RAID do not support a recovery partition and can't be used with Find My Mac.

You have no recovery partition. This is a normal condition if your boot volume is a software RAID, or if you modified the partition table after running Boot Camp Assistant to create a Windows partition. Otherwise, you need to reinstall OS X in order to add a recovery partition.
If you don't have a current backup, you need to back up before you do anything else.
You have several options for reinstalling.
1. If you have access to a local, unencrypted Time Machine backup volume, and if that volume has a backup of a Mac (not necessarily this one) that was running the same major version of OS X and did have a Recovery partition, then you can boot from the Time Machine volume into Recovery by holding down the option key at the startup chime. Encrypted Time Machine volumes are not bootable, nor are network backups.
2. If your Mac shipped with OS X 10.7 or later preinstalled, or if it's one of the computers that can be upgraded to use OS X Internet Recovery, you may be able to netboot from an Apple server by holding down the key combination option-R at the startup chime. Release the keys when you see a spinning globe.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
3. Use Recovery Disk Assistant (RDA) on another Mac running the same major version of OS X as yours to create a bootable USB device. Boot your Mac from the device by holding down the option key at startup.Warning: All existing data on the USB device will be erased when you use RDA.
Once you've booted into Recovery, the OS X Utilities screen will appear. Follow the prompts to reinstall OS X. You don't need to erase the boot volume, and you won't need your backup unless something goes wrong. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
If none of the above choices is open to you, then you'll have to start over from an OS X 10.6.8 installation. There's no need to overwrite your existing boot volume; you can use an external drive. Install 10.6 from the DVD you originally used to upgrade, or that came with the machine. Run Software Update and install all available updates. Log into the App Store with the Apple ID you used to buy 10.7 or later, and download the installer. When you run it, be sure to choose the right drive to install on.

Xserve G5 won't boot off Hardware RAID partition

I'm running an Xserve G5, 2.0 GHz single processor, OS X Server 10.4.5 with an Apple Hardware RAID card with 3 500GB drive modules in a RAID 5. The RAID is partitioned into two partitions, one for the system and one for data. After installing a video card, the Xserve will not boot off of the system partition on the RAID. It will boot just fine off a clone of that exact partition on a firewire drive, which is how I have it functioning at the moment. I have tried erasing the system partition on the RAID and re-installing the Server software but whenever I try to boot it it gives me the flashing folder Icon. I have tried resetting the NVRAM as well as restoring the functional backup of the system to no avail.
Any ideas? (I have run disk utility, DiskWarrior, repaired permissions etc.) I also checked the status of the RAID and it is in optimal condition. The data partition seems to be just fine and the system partition seems normal when booted from the external drive.
Xserve, Dual 2.7 G5, G4 Powerbook, many others Mac OS X (10.4.5)

Harry, I just saw your post. I went through the same pain last fall, and it WAS resolved through Apple Support, but you aren't going to like the solution. Simply as background, during the pre-deployment testing of our Xserve, we were having problems with the Apple BTO SCSI card (really, an LSI Logic 22320) and swapped it out with an ATTO UL4D. Something in the card removal/replacement caused our Apple Hardware RAID card to go into the same mode as yours, where it would work fine as a RAID 5 (two LUNs, 50 GB and 417 GB, over 3x250 GB ADMs) but would not boot. Apple Support and I concluded that something had become corrupted in the firmware or boot code on the Apple Hardware RAID card, but they did not have a file to use to flash it, so they swapped out the card under our support contract, and that fixed it. I still believe that, if I had had a file to flash the card with using the megaraid command, that the original card would have been fixed. FYI the new card has Firmware Version: A131, BIOS Version G117, the old card had Firmware Version: A130, BIOS Version G117. Completely unrelated to this, I've had a RADAR bug report (RADAR #4350243) open since last November that the Apple Hardware RAID card fails to fully flush its write caches on graceful power down. I've got a test case that is 100% reproducible, causes mystery garbage blocks from space. I'd suggest that you turn the write caches off on all LUNs on your Apple Hardware RAID card as a workaround until this is fixed. LSI Logic (the Apple Hardware RAID card is a rebranded LSI Logic card) found and fixed this bug on a later firmware rev from Apple's version. No update is available yet from Apple.
Xserve G5 Mac OS X (10.4.6)
Xserve G5 Mac OS X (10.4.6)

Problem with Installation on DELL Poweredge with Hardware RAID 1

Hello Arch LInux community,
I am a newbee with good linux knowledge of working on linux but not much of systems administration. I am very much interested to install Arch Linux on my new desktop which is a Dell poweredge having hardware RAID 1(PERC .... controller). It has windows 7 OS on its first partition.
I saw on the controller's BIOS menu that there are 2 1tb hard drives with something like --:--:00 and --:--:01 labels. And they were partitioned into two logical volumes which are visible once I boot into Arch linux live CD as, /dev/sda (about 250GB, and has windows OS on it) and /dev/sdb (about 700GB).
Firstly, I am confused with the hard disk labels: even though they are logical partitions (i.e: combined by RAID 1, they are seen as /dev/sda and /dev/sdb). In the arch linux Beginner's wiki, there is some description on configuring for RAID, which included mdadm or mdadm_udev module specification. I did include these modules, and followed the installatin instructions carefully. I was trying to install on /dev/sdb, with the following partitioning:
Sector map of partitions on /dev/sdb : 1542848512 : 735.7 GiB
Disk identifier (GUID) : 967BF308-6E5E-43AD-AB2E-94EB975C3603
First usable sector = 34 Last usable sector = 1542848478
Total free space is 2023 sectors
Number    Start End    Size    Code Name
   34 2047       FREE
1    2048 2099199    1024.0 MiB EF00    EFI System
2    2099200 2103295    2.0 MiB EF02 BIOS boot partition
3    2103296 2615295    250.0 MiB 8300 Linux filesystem
4    2615296 212330495    100.0 GiB 8300 Linux filesystem
5    212330496 317188095 50.0 GiB 8300 Linux filesystem
6    317188096 1541924863 584.0 GiB 8300    Linux filesystem
   1541924864 1542848478       FREE
The instruction on the Beginner's wiki is somewhat difficult to understand for beginners. Especially I wasn't sure whether to make EFI System partition and BIOS boot partition or just EFI system partition. So I made both as per the instructions.
Is using UEFI compulsory, on UEFI based systems?
A little bit more sub-headings or division of instructions, in the Beginner's wiki, based on the usage scenarios can be very beneficial for newbees like me.
I am finally getting the following error when I select the Arch Linux from the GRUB menu. Why it can't find the device? I shall wait for your initial responses, and will give more specifics of my installation to find out any wrong step that I may have made.
[ 0.748399] megasas: INIT adapter done
ERROR: device 'UUID=40e603e9-7285-4ec8-8a06-a579358a52a0' not found. Skipping fsck
ERROR: Unable to find root device 'UUID=40e603e9-7285-4ec8-8a06-a579358a52a0' .
You are being dropped to a recovery shell
Type 'exit' to try and continue booting
Sh: can't access tty; job control turned off
[rootfs /]#

Well, you can see your RAID partitions and you're getting GRUB to load, and you are even being dropped to the recovery shell which means that the /boot partition is being found and is accessible. All vary, vary good things.
I would boot into the Arch live CD/USB again. Then check the UUID of the / Root partition. To do this I just check the log listing of /dev/disk/by-uuid
ls -l /dev/disk/by-uuid
Hopefully the UUID for the /root partition in the /boot/grub/grub.cfg is incorrect, and all you need to do is change it from 'UUID=40e603e9-7285-4ec8-8a06-a579358a52a0' to the correct UUID.
If the UUID is correct... then maybe the correct driver module is not complied into the initramfs. You could try adding that mdadm to the MODULES= list in /etc/mkinitcpio.conf then rebuild the initramfs again.
mkinitcpio -p linux
Hum..., the whole /dev/sda and /dev/sdb.... hum, You know... Maybe you need to change the line in /boot/grub/grub.cfg
set root='hd1,msdos1'
The hd1 is the equivalent to /dev/sda and the msdos1 is the equivalent of the First Partition i.e. /dev/sda1.. (note this is my disk yours may correctly have different numbers and not be a msdos partition)... owe wait... hum, you know I am fairly sure that like is really the root disk where the /boot partition is and has no relation to the / Root partition... Someone clear that up please.... It is hard for me to recall and I have my / Root parition encrypted, so It is hard for me to make heads or tails of that one right now, but that could be the problem too i.e. try changing hd1 to hd2 or hd0 or something.
Owe, and it may be faster if you just make temporary corrections to the GRUB menu by hitting the "e" key on the menu entry you want to change then hit.. I think F10 to boot the modified entry. That way you don't need to keep booting into the Live CD/USB
Last edited by hunterthomson (2012-09-20 05:52:33)

Solaris 10 X86 - Hardware RAID - SMC/SVM question...

I have gotten back into Sun Solaris System Administration after a five year hiatus... My skills are a little rusty and some of the tools have changed, so here is are my questions...
I have installed Solaris 10 release 1/06 on a Dell 1850 with an attached PowrVault 220v connected to a Perc 4 Di controller. The RAID is configured via BIOS interface to my liking, Solaris is installed and see's all my partitions which I created during install.
For testing purposes, the servers internal disk is used for the OS, the PowerVault is split into 2 RAID's - one is a mirror, one is a stripe...
The question is; do I manage the RAID using Sun Management Console and the tools OR do I use SMC?
When I launch SMC and go into Enhanced Storage... I do not see any RAID's... If I select "Disks" I do see them, but when I select them, it wants to run "FDISK" on them... now this is OK since they are blank but I want to ensure I am not doing sometinhg I should not be concerned with...
If the PERC controller is controlling the RAID, what do I need SMC for?

You can use SMC for other purposes but it won't help your with RAID.
Sol 10 1/06 has raidctl which handles LSI1030 and LSI1064 RAID�enabled controllers (from raidctl(1M)).
Some of the PERCs (most?) are LSI but I don't know if they are chipsets used by your PoweEdge (I doubt it).
Generally you can break it down like this for x86:
If you are using hardware RAID with Solaris 10 x86 you have to use pre-Solaris (i.e. on the RAID controller) managment or hope that the manufacturer of the device has a Solaris managment agent/interface (good luck).
The only exception to this that I know of is the RAID that comes with V20z, V40z, X4100, X4200.
Otherwise you will want to go with SVM or VxVM and manage RAID within Solaris (software RAID).
SMC etc are only going to show you stuff if SVM is involved and VxVM has its own interface, otherwise the disks are controlled by PERC and just hanging out as far as Solaris is concerned.
Hope this helps.

Partition recommendations under RAID 5 in Intel Xserve

So I am preparing for a new OS X server installation on an Xserve Intel with (3) 2 TB volumes to be setup in RAID 5. Our budget would not allow the addition of an SSD drive. I would like to have two volumes under RAID 5: (1) our boot volume with OS and (1) our data and sharepoints. It would be nice to keep the OS separate from my sharepoints in case I need to do a reformat and reinstall.
Our current server setup has a RAID 1 mirrored boot volume on a G5 with an XServe RAID 5 array (all one volume unpartitioned). I also have a second FireWire hard drive connected that I use to maintain a bootable clone of our boot volume.
On our new Xserve Intel with RAID 5, is there a way to have (2) partitions under RAID 5: (1) a 150 GB boot volume and (1) an approx 3.85 TB volume that will contain all of our sharepoints. Since our server is still in transit, I do not have a machine on hand I can experiment with.
Would you create two partitions on each hard drive then join each to their respective RAID 5 array so you have two volumes—one for the OS and one for the sharepoints?
Or, with RAID 5, would it be better to keep the array as one single volume and keep the OS and sharepoints all on the same volume without any partitions? My preference would be to keep it as stable a setup as possible? Obviously, if we were to keep the OS and sharepoints as one volume, I could image the OS installation once it is stable (and without the sharepoints) and keep the image on hand just in case I needed to revert to it in case of a problem.
What would you recommend?
Thanks!

Yes, you can partition the drives as you want. The only practical way to do this is to use hardware RAID to create the RAID 5 volume with all three disks, then use Disk Utility to split this array into two partitions.
You're not going to gain much benefit from this, though. The main advantages of using different volumes for OS vs. data is for performance reasons, but you lose that here since a) you're using RAID 5 and b) all your data is on the same physical disks anyway.
About the only thing you gain is a guard against the data volume growing to the point it consumes all space on the drives and hoses your OS (because the OS is on a different volume) or vice versa, but that's a small benefit IMHO.
As for disk failure, you're no better off with partitioning than you would be with a single partition for both data and OS - either way a single disk failure will be handled by the hardware RAID card until the disk is replaced, and all your data (both OS and Data) is equally protected/at risk either way.
So my recommendation would be to use RAID 5 across all disks and be done with. No further partitioning is necessary. It is, however, your server, and you can run it however you prefer
As for the stability issue - don't bother with a disk image - it'll be outdated before you blink and will be a PITA to keep up to date.
The easier option is to create a directory for all your sharepoints and just manage your backups such that this directory is excluded from your OS backups, and included in your data backups.

Best protocol for dual booting on a hardware RAID 0 array?

Hi folks. I would like to dual boot Windows 7 and Arch. I'll append the specs. I have a Terrabyte to split evenly between the two drives - each is 500G. Unless someone can come up with a reason and convince me otherwise, I want to do away with the RAID array. There's no redundancy anyhow and the speed I would lose breaking the array is negligible, therefore irrelevant.
My issue is that I have a RAID 0 hardware array with Intel Rapid Storage Technology as the controller. The computer did NOT come with a Windows disk, but rather a recovery partition. It is my understanding that if I break the array, I will lose the recovery partition and will not be able to reinstall Windows - which I need. IF....the recovery partition can be unphased by breaking the array and I can use it to reinstall Windows, I would prefer that since I may need to recover Windows in the future. It's not a deal breaker if I can't keep the recovery partition, since I have the Windows key.
Is this the ideal protocol?:
1. Backup - I plan on using Alienware Respawn or Clonezilla to backup to a CD and will also backup to an external drive.
2. Break array, but do not alter BIOS to AHCI - leave as RAID.
3. Restore Windows on one drive.
4. Install Arch on second drive.
5. Configure GRUB.
6. Smoke stogie or alternatively weep because I turned my computer into a brick.
At which stage does the partitioning come in? Before or after breaking the array? Is there a better method, than the one I listed. I have spent days scouring Google and the forums and while it's easy to find info on breaking a hardware RAID, there isn't much on doing this with the recovery partition and Alienware Respawn aspects involved. Any help would be appreciated. Please don't kill me or shred my diameter.
==================================================================================
Specs:
Processor: Intel(R) Core(TM) i7 CPU Q 740 @ 1.73GHz 1.73 Ghz: 8 Intel(R) Core (TM) i7 CPU q740 @ 1.73GHz
Installed Memory: 8.00 GB RAM
64 Bit Operating System
Alienware M17X10
Windows 7 Home Premium
Performance Options: DEP turned on. Virtual Memory: 8180 MB
Architecture: AMD64 Intel64 Family 6 Model 30 Stepping 5, GenuineIntel
Computer: ACPI x64-based PC
Display Adapters: 2 ATI Mobility Radeon HD 5800 Series
DVD/CD-ROOM: HL-DT-ST DVDRWBD CA10N
IDE ATA/ATAPI controllers: Ricoh PCIe Memory Stick Host Controller, Ricoh PCIe SD/MMC Host Controller, and Ricoh PCIe xD-Picture Card Controller
IEEE 1394 Bus host controllers: Ricoh 1394 OHCI Compliant Host Controller
Imaging devices: Integrated Webcam
Mice; 3 HID-Compliant Mouse and Synaptics PS/2 Port Toch Pad
Monitor: Generic PnP Monitor
Sound, video and game controllers: AMD High Definition Audio Device and High Definition Audio Device
Storage Controllers: Intel(R) Mobile Express Chipset SATA RAID Controller

I think the big thing will be backing up. I don't know anything about the two programs you would use, but I know that if I dd copy the disks, I would have to change the size of the partitions to match the size of the new partitions. IE: I have Arch installed on a RAID0 of 32GB each, and if I wanted to break my RAID and install on just one disk, I would have to shrink the size of my dd'ed copy to match the smaller drive.
Otherwise, it looks like you have the right idea, or at least the right direction.

Partitoning a Hardware Raid

OK, I have already searched the net to no avail, im hoping someone here will be able to help me.
I currently have an external 300gb HD with 2 partitions, one is a bootable backup and the other is storage. I have recently realized that if this drive were to fail I would lose a ton of important data. I therefore have decided to create a raid setup. I am considering purchasing a Buffalo DriveStation Duo with 2 500GB drives in it. I would set this up in a RAID 1 array so I will have 500gb of usable space with a constant mirror image backup. My question is, can I partion the RAID into 2 partitions (as I have now with my 300 gb drive) one for a bootable backup and one for storage and still maintain the mirroring. In essence I want to have 1 drive with 2 partitions on it, and have the drive still be mirrored to the second drive.
First-Is this possible?
Second-Will I still be able to boot from the boot partition?
Three-If so, can having more than one partition on a raid create problems, such as increased disk failure, slower speeds, etc?
Thanks in advance to anyone that can help me with this!

Well, the reason that I wanted to do this raid array is because I store allot of files on my external drive that are not on my internal drive, therefore if my external drive were to fail my files would be gone for good. I also keep a bootable backup that I constantly recreate on a seperate partition of the external drive. I thought if I create the RAID then I would avoid loss of data in the event of a disk failure.
As far as using my current drive, I was going to upgrade the amount of storage that I had and set up the raid system at the same time, If I buy 2 500gb drives I will have 500gb of usable space instead of 300gb.
I am however unfamilier with OS X RAID software, is this the same as a "software raid" as I have heard that a software raid is much slower than a hardware raid because it uses you computers processer to mirror data rather than using a raid card in the enclosure.
As for cost, I can buy this drive station duo (does raid 0 and 1, has firewire 800, 400, and usb, and an internal hardware raid) with 2 preinstalled 500gb sata drives for $300. I thought that this was a pretty good price for what I am getting but I am very uneducated in all of this and could be very wrong.
If, like you said earlier, I can partiton the drives and then create a raid (with the harware raid and not need a "dual raid card" or whatever) I would do that. Are you saying that I would only be able to have the 2 raids required if I use the OS X software.
I guess my questions boil down to this
1. Is the OS X raid software considered a "software raid" and is it slower than a hardware raid? If so, by how much?
2. If its not any slower, What materials would you recomend to build this considereing I want 500gb of usable space rather than the old 300gb?
Also, if its not slower where is this software in the OS, Disk Utility? And how would I use it?
3. If this software way is slower then I would still want to use the hardware method that I have been pursuing, can I still make the partitions in advance and then make 2 raids or will this not work with the hardware method?

No RAID support, even hardware raid on the enclosure level

According to a report from XLR8Yourmac.com, a customer bought an Airport Extreme (n) basestation but was unable to have their RAID enclosure recognized. Instead, only one drive shows up instead of two, and is unreadable. Applecare told him that even hardware RAID needs to be supported at the driver level for the unit, and they didn't think the Extreme had enough horsepower to do it. I question this, since you can attach RAID enclosures to computers so old, they are less powerful computers than the n basestation.
This is very bad news for me, as I have two 1TB RAIDs (OWC Mercury Elite Pro 800/400/USB2 SATA RAID enclosures) that I was going to attach to the new extreme, but now, I'm not buying one at all...

OK, thank you. That's exactly my status. And since this machine is very slow and has only around 1GB of memory (minus memory for the GPU!), a swap partition seems pretty important - and be it only for hibernating.
For the records: I recently thought about trying out a swap file on a dedicated non-journaled partition (ext2 f.ex.) mounted with nodiscard. I don't know how much performance I would lose or if hibernating really works flawlessly. But since I'm now using a different harddrive for the netbook and it's running, I don't want to setup everything again at the moment. If anybody tries the swap file variant, it would be nice to report back in this thread :-)

PCI ATA 66 Hardware RAID, follow up.

http://discussions.apple.com/thread.jspa?threadID=1015242&tstart=0
Just to recap, the problem that I was having in this archived post booting OS X from my 120GB+120GB hardware PCI ATA66 RAID0 drive, was in fact due to the <8GB partition limitation. XPostFacto doesn't enforce this on the PCI card, and it worked for a while with no helper, until after the 10.4.10 software update, which must have written some files past the 8GB portion of the drive. I can now still boot from my hardware RAID, I just have to use a helper in XPostFacto, like if you were booting a FW drive.

Just to clarify, I was talking about the ACARD ATA66RAID hardware RAID card, it works in OS9 or OSX, when you set the dip switch on the card to RAID 0 striping, the OS sees it as large SCSI drive, and you can optionally install the OS 9 drivers with Disk Utility in OS X, or initialize it in OS 9 with Drive Setup. First you have to initialize each drive individually in normal mode before setting the striping switch. Booting OS 9 has a volume size limitation, though, (<190GB or 200GB, not sure exactly) and my 120GB+120GB volume exceeds that.
I am using two individually cabled Master drives, I think you can also stripe two Slaves with this card, so then you could set up a software mirrored RAID with the two striped RAIDS, there's just not any more room in the G3 Desktop for any more drives though.
Probably not too many folks use those cards, the ACARD 6860M, they were a lot more expensive when they first came out, but you might find a good deal on one now. You can probably get better i/o peformance and larger max drive size from ATA-100, ATA-133 or SATA PCI cards, not sure of the latest price comparison on those.
From memory, the built-in ATA gets around 16MB/sec, the PCI66 can get around 40MB/sec and so can external FW, the ATA66RAID can get up to 60MB/sec. There's lots of variation in those numbers depending on usage. Not sure what numbers you get with ATA 100/133/SATA...those are also more $$$.

Can I add partitions on a RAID 0 setup?

Hi everyone,
I just recently bought a used macbook pro, (15-Inch, Early 2008) that the previous owner put a RAID 0 setup on. I want to try out the OSX Yosemite Beta, but i want to try it on a separate partition so I can keep my Mavericks environment intact. I don't know i it is possible, but I would like some help on how to make a partition with the RAID setup on it. (I do have an external hard drive too, is there a way to run Yosemite off of the external instead of messing with the internal on my MBP?) Thanks in advance for your help!!!
Tommy

Camelot wrote:
This doesn't sound like an XServe RAID question - the XServe RAID is a (now-discontinued) 14-drive RAID enclosure designed for server applications.
I apologize for not knowing where. I know how forum members get upset when people use the wrong forum. It was unintentional.
For a start there's a question of the enclosure... Is the enclosure a 'dumb' enclosure that just connects the drives to your host system, or does it have a built-in RAID controller.
It is not a dumb enclosure - it does have jumpers for setting it up under different strategies.
That is going to be critical in answering your question. If the enclosure has a built-in RAID controller then you will want to use that to manage the RAID 1 mirror setup and you'll likely need to use software provided by the enclosure vendor to set that up.
Where I am at is that DU does NOT allow this system to be used and recognized by TC. I had to set the enclosure under RAID 1 and that is the only way the TC would allow it to be recognized by my network
Once that's done your host system will be presented with a 1TB volume (the RAID/mirror is hidden from the OS) and you can partition that like any other drive.
If the enclosure is dumb it's a little more complex since you'll need to configure the mirror via Disk Utility and then partition the resulting volume (note also that throughput will be lower in this mode since the OS has to write twice as much data over the link to the enclosure - with a hardware RAID in the enclosure the OS only has to write one copy of the data and the enclosure takes care of writing it to both disks).
So, what's the enclosure you're using?
I am using the Hornettek unit.
Thanks for your help. It took me a long time to get to where I am with this unit. TC evidently will not allow it to be recognized if I used DU to configure it.

Using a Mac Pro w / Apple Internal Hardware RAID Card?

Anyone using a Mac Pro with a Apple Hardware RAID Card 2010?
( I have a 12 Core )
Is it worth the $600-700 ?
How much faster than the software RAID 0?
I see Hamm's RAID tips chart .. but it doesn't include such options .. plus it is based on a PC system.
Any tips would be great ..
I find many areas where the application is slow / unresponsive .. and I'm not sure where the bottleneck is ... Maybe the hardware RAID will solve it?
I'm really am impressed with CS5 .. it would be even better with some adjustments .. but I am absolutely disappointed with sluggish performance on my top-of-the-line Mac Pro 12 Core.
This is not what I expected for a $8,000 machine.
Some users says that the port of CS5 for the Mac has taken a back seat to the Windows version at Adobe.
I can't imagine that Adobe would not put 100% effort into Mac products.
Go Team!!!

I have a 2009 Mac Pro 3.33GHz Quad core w/ Apple RAID card, 16GB RAM from OWC, and Apple's Radeon HD 5870 GPU.
I have RAID 0 set across 3x1TB drives internally, and the standard 640GB drive for OSX and all program files. I set all video assets, renders, previews and such on the 3TB RAID.
This seems to work wonderfully. I built this system specifically to edit a feature film shot on P2 DVCProHD, and I've been impressed with how it handles it. This was all built prior to CS5, which took me by surprise. Had I known nVidia would become such a problem for Apple, I would have built a PC, but that's another story.
I just started a new project in CS5 on the same system, this time using H.264 video from my Nikon D7000, and so far, it seems to play just as nicely, despite not having hardware acceleration via CUDA technology. Yellow bars on top, even. I haven't had any problems with clips taking a long time to populate on the timeline or any of that, so perhaps the RAID card helps there.
All this aside, I've already decided to upgrade my RAID for another reason. Right now, my backup is performed via an eSATA-connected external drive through a PCI eSATA card. After every edit session, I dump everything on the RAID onto the external drive, and it goes much faster than the old FW800 transfer used to. I'm about to replace my Apple RAID card with an Areca card and set up a 4-bay RAID 3 via an SAS connection. This will allow for excellent data throughput while offering more security than my current RAID 0 / manual backup system, and free up the internal drives for backups, exports and render files.
I believe in hardware RAID, but I'm not as knowledgeable as Harm and others are about it. I had my Mac built to order with the Apple RAID card, so I have no experience using Premiere with a software RAID. Due to my smooth experience using it, I think it was worth it, but plenty of people say the Apple RAID card is rubbish, and to go with Areca or Atto cards. I didn't know about them until after I built my system, and even though it will cost a couple thousand to upgrade my RAID from this point, I expect to have an even better system than I already have.
I hope this helps, and feel free to ask any questions I didn't address.

My hardware RAID 1 only showing up in disk utility and not finder.

Last week I finally was able to take my early 2011 iMac in to have my Seagate 1TB hard drive replaced for the recall.
Late 2010 model iMac
OS X 10.6.8
OWC Mercury Elite Pro 4TB x 4TB Hardware RAID
When I took it in the RAID 1 was working just fine. When I finally got the iMac back and booted everything up the RAID 1 was getting the dialog box that read "The disk you inserted was not readable by this computer."
I have tried going into disk utility to see if I can verify the disk and then saw it is coming up as two different volumes... Along with those two different volumes, I can not go to click verify as it is greyed out.
I contacted OWC and they said they have never heard of this and had two solutions, to try a software like diskwarrior, or if that didnt work I can take the drives out and try another external dock to see if it is the RAID hardware.
If anyone has any ideas as to what could help with this situation that would be great as I was under the impression (and told by a number of other people) that having a RAID 1 as my backup was good and should not need anything else. I just want to be able to get all the data off then I will rebuild it or send it into OWC.
Thanks!!!!

So a fault in the Hardware Raid controller could make it not read properly? I am planning on having a good backup set up after this!
As for the screenshot, the original was not set up with the SoftRaid. When I got the computer back I installed that to see if that may pick it up and make it at least readable to save the data on it. The two in question are the highlighted 4TB drives, which befor also read as one drive as it was set up in the OWC enclosure as a hardware raid.

Systemd-fsck complains that my hardware raid is in use and fail init

Hi all,
I have a hardware raid of two sdd drives. It seems to be properly recongnized everywhere and I can mount it manually and use it without any problem. The issue is that when I add it to the /etc/fstab My system do not start anymore cleanly.
I get the following error( part of the journalctl messages) :
Jan 12 17:16:21 biophys02.phys.tut.fi systemd[1]: Found device /dev/md126p1.
Jan 12 17:16:21 biophys02.phys.tut.fi systemd[1]: Starting File System Check on /dev/md126p1...
Jan 12 17:16:21 biophys02.phys.tut.fi systemd-fsck[523]: /dev/md126p1 is in use. <--------------------- THIS ERROR
Jan 12 17:16:21 biophys02.phys.tut.fi systemd-fsck[523]: e2fsck: Cannot continue, aborting.<----------- THIS ERROR
Jan 12 17:16:21 biophys02.phys.tut.fi systemd-fsck[523]: fsck failed with error code 8.
Jan 12 17:16:21 biophys02.phys.tut.fi systemd-fsck[523]: Ignoring error.
Jan 12 17:16:22 biophys02.phys.tut.fi systemd[1]: Started File System Check on /dev/md126p1.
Jan 12 17:16:22 biophys02.phys.tut.fi systemd[1]: Mounting /home1...
Jan 12 17:16:22 biophys02.phys.tut.fi mount[530]: mount: /dev/md126p1 is already mounted or /home1 busy
Jan 12 17:16:22 biophys02.phys.tut.fi systemd[1]: home1.mount mount process exited, code=exited status=32
Jan 12 17:16:22 biophys02.phys.tut.fi systemd[1]: Failed to mount /home1.
Jan 12 17:16:22 biophys02.phys.tut.fi systemd[1]: Dependency failed for Local File Systems.
Does anybody undersand what is going on. Who is mounting the /dev/md126p1 previous the systemd-fsck. This is my /etc/fstab:
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sda1
UUID=4d9f4374-fe4e-4606-8ee9-53bc410b74b9 / ext4 rw,relatime,data=ordered 0 1
#home raid 0
/dev/md126p1 /home1 ext4 rw,relatime,data=ordered 0 1
The issue is that after the error I'm droped to the emergency mode console and just pressing cantrol+D to continues boots the system and the mount point seems okay. This is the output of 'system show home1.mount':
Id=home1.mount
Names=home1.mount
Requires=systemd-journald.socket [email protected] -.mount
Wants=local-fs-pre.target
BindsTo=dev-md126p1.device
RequiredBy=local-fs.target
WantedBy=dev-md126p1.device
Conflicts=umount.target
Before=umount.target local-fs.target
After=local-fs-pre.target systemd-journald.socket dev-md126p1.device [email protected] -.mount
Description=/home1
LoadState=loaded
ActiveState=active
SubState=mounted
FragmentPath=/run/systemd/generator/home1.mount
SourcePath=/etc/fstab
InactiveExitTimestamp=Sat, 2013-01-12 17:18:27 EET
InactiveExitTimestampMonotonic=130570087
ActiveEnterTimestamp=Sat, 2013-01-12 17:18:27 EET
ActiveEnterTimestampMonotonic=130631572
ActiveExitTimestampMonotonic=0
InactiveEnterTimestamp=Sat, 2013-01-12 17:16:22 EET
InactiveEnterTimestampMonotonic=4976341
CanStart=yes
CanStop=yes
CanReload=yes
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=no
OnFailureIsolate=no
IgnoreOnIsolate=yes
IgnoreOnSnapshot=no
DefaultControlGroup=name=systemd:/system/home1.mount
ControlGroup=cpu:/system/home1.mount name=systemd:/system/home1.mount
NeedDaemonReload=no
JobTimeoutUSec=0
ConditionTimestamp=Sat, 2013-01-12 17:18:27 EET
ConditionTimestampMonotonic=130543582
ConditionResult=yes
Where=/home1
What=/dev/md126p1
Options=rw,relatime,rw,stripe=64,data=ordered
Type=ext4
TimeoutUSec=1min 30s
ExecMount={ path=/bin/mount ; argv[]=/bin/mount /dev/md126p1 /home1 -t ext4 -o rw,relatime,data=ordered ; ignore_errors=no ; start_time=[Sat, 2013-01-12 17:18:27 EET] ; stop_time=[Sat, 2013-
ControlPID=0
DirectoryMode=0755
Result=success
UMask=0022
LimitCPU=18446744073709551615
LimitFSIZE=18446744073709551615
LimitDATA=18446744073709551615
LimitSTACK=18446744073709551615
LimitCORE=18446744073709551615
LimitRSS=18446744073709551615
LimitNOFILE=4096
LimitAS=18446744073709551615
LimitNPROC=1031306
LimitMEMLOCK=65536
LimitLOCKS=18446744073709551615
LimitSIGPENDING=1031306
LimitMSGQUEUE=819200
LimitNICE=0
LimitRTPRIO=0
LimitRTTIME=18446744073709551615
OOMScoreAdjust=0
Nice=0
IOScheduling=0
CPUSchedulingPolicy=0
CPUSchedulingPriority=0
TimerSlackNSec=50000
CPUSchedulingResetOnFork=no
NonBlocking=no
StandardInput=null
StandardOutput=journal
StandardError=inherit
TTYReset=no
TTYVHangup=no
TTYVTDisallocate=no
SyslogPriority=30
SyslogLevelPrefix=yes
SecureBits=0
CapabilityBoundingSet=18446744073709551615
MountFlags=0
PrivateTmp=no
PrivateNetwork=no
SameProcessGroup=yes
ControlGroupModify=no
ControlGroupPersistent=no
IgnoreSIGPIPE=yes
NoNewPrivileges=no
KillMode=control-group
KillSignal=15
SendSIGKILL=yes
Last edited by hseara (2013-01-13 19:31:00)

Hi Hatter, I'm a little confused about your statement not to use raid right now. I'm new to the Mac, awaiting the imminent delivery of my first Mac Pro Quad core with 1tb RAID10 setup. As far as I know, it's software raid, not the raid card (pricey!). My past understanding about raid10 on any system is that it offers you the best combination for speed and safety (backups) since the drives are a striped and mirrored, one drive dies, quick replacement and you're up and running a ton quicker than if you had gone RAID5 (20 mins writes per 5G data?)Or were you suggesting not to do raid with the raid card..?
I do plan to use an external drive for archival backups of settings, setups etc, because as we all know, if the best fool proof plans can be kicked in the knees by Murhpy.
My rig is destined to be my video editing machine so the combo of Quad core, 4G+ memory and Raid10 should make this quite the machine.. but I'm curious why you wouldn't suggest raid..
And if you could explain this one: I see in the forums a lot of people are running Bootcamp Parralels(sp) which I assume is what you use to run mulitple OS on your Mac systems so that you can run MacOS and Windblows on the same machine.. but why is everyone leaning towards Vista when thems of us on Windblows are trying to avoid it like the plague? I've already dumped Vista from two PCs and installed XP for a quicker less bloated PC. Is vista the only MSOS that will co-exist with Mac systems? Just curious..
Thanks in advance.. Good Holidays

Partitioning a Hardware RAID

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