Internal RAID with 2 different drive makes

Currently, I have a 750GB Scorpio Black drive and I have about 20% free space. Originally, I had originally planned on swapping out the optical and putting another SB 750GB in there and creating a RAID 0. However, now that Seagate has released a 750GB Momentus Hybrid, I was wondering if I could get one of those and use it in conjuction with the Scorpio? I know I might lose a minimal amount of space as one drive might be read as slightly smaller, no big deal. How would the controller in the Seagate function in respects to what it put to the SSD portion? A RAID 0 with 2 Seagates would be optimal, I know, but I'd like to conserve a little on the funds.

RAID 0 is ludicrous for a boot drive other than a Mac Pro, then a SSD is much better and safer choice.
Apple won't let one install OS X on a RAID 0, other means has to be employed to get OS X onto the boot RAID o set.
RAID 0 splits the data path amongst all the drives in the set, any glitch with any drive and all your data is gone, *poof*.
So you have to maintain a cloned backup on a external drive nearly everyday, which is easy in a MacPro as there are four drive bays.
If you want speed and reliability in a boot drive, go with a SSD (barely keep any users files there) and use the other drive in the optical bay for large storage capacity, especially with a laptop as it's moved around a lot and thus the drive gets damaged more than a desktop.
You should know one can't boot from a OS X install disk once the optical drive is replaced, external optical booting is not possible.
So your going to need to learn how to clone your boot drive to blank extenral drive using the donationware Carbon Copy Cloner and hold the option key down while booting to use it, thus clone onto the new SSD or whatever.
I ran a boot RAID o 2x 10,000 RPM drives in a PowerMac G5 for many years, the performance was awesome, but only if I was doing large moves of data or many things that accessed the boot drive constantly. Most small time stuff there was really no difference with a regualar 5,400 RPM drive.
However back then the cloning was manual, no automatic ability like there is now.
A fresh install of 10.6 on a SSD will brighten your day.

Similar Messages

RAID with two USB drives?

I just bought two USB drives (2 x WD 3 TB MyBook Essential) and tried to set them up as mirrored RAID on my Mac Mini (Mid 2010 model, OS X 10.7) using Disk Utility. It lets me do all the configuration (pick disks, etc.) but when I hit create, I get the following error:
POSIX reports: The operation couldn't be completed. Operation not permitted.
Is there any way to solve this / explanation why this happens?

Here is an app that should do what you are looking for.
http://qgf.in/BBRBMh
that will take you to a shareware page at apple.com. The software lets you compare two different drives and select which way you want the changes to go.
It is shareware so you should be able to try it out before you buy it. Make sure it does what you want.
Another option is Chronosync http://qgf.in/PLfpeu . It is a little pricey, but it works well.
Message was edited by: D0GG

Disk utility Q: setting up RAID with 2 firewire drives

Hi,
I tried setting up a redundant RAID with two LaCie 250gb firewire drives in Apple's Disk Utility. All was OK until I restarted. The RAID didn't show up, and both disks came up as unreadable. I was unable to reformat, erase, repair, or partition either of the LaCie drives. I tried new cables and both the front and rear Firewire ports. No matter what I did, I got an input/output error.
I was able to erase and reformat one of the drives on my powerbook running 4.6. The other drive appears to be DOA, as it clicks and blinks and does little else.
So what gives? I'm going to exchange the dead drive, but I don't want to have the same problem with setting up a RAID if the same nonsense is going to happen again. Any thoughts?

FW RAID on G5s is PITA and very poor performance. You would also need a PCI FW800 controller to get a boost or anything like normal. If you want any type of RAID, invest in Serial ATA drive/case/controller.
SeriTek if you want it to be bootable. SeriTek or Sonnet for direct connect. Sonnet if you think you might need more than 4 drives and use Port Multiplier.
There is only one FW channel that has to be shared if you don't invest in one or more FW800 controllers.
My bet is the drive could be fine but needs to be zeroed and could have damaged boot blocks at this point.
I am not a fan of mirrors. Backups, yes, lots. Stripped for scratch and even a dedicated boot OS/apps, yes. I've run with Disk Utility and SoftRAID (3.5) for 4 yrs now but mostly SCSI and one FW800 RAID which only gets about 75-80MB/sec. Even a single drive gets near 60MB/sec and a mirror would cut that in half.

Software RAID-1 with two different drives

Hi,
I got a 2 TB Seagate Barracuda, which I am looking to mirror in a RAID-1 set-up. Now, since the space is filling rather fast, I suspect I'll have to keep adding disks to this machine in the future. So, I have a interest in changing to some low power (since its always on) drives.
So, I'm thinking of making the second disk a 2 TB Seagate NAS drive (and then use NAS drives from this point on), which is a fair bit slower than the main drive. Personally, I wouldn't expect this to be a problem at all, but I thought it would be best to check with others first though
Have anybody here tried running a RAID-1 where one disk is considerably slower than the other? Will this give any issues (other than the speed being limited by the slower disk)?

WonderWoofy wrote:
The speed will certainly be limited by the slowest device, as you mentioned, but what I am confused about is what you expect to achieve by continually adding drives to a RAID-1? At some point, do you plan on changing the RAID level? Because RAID-1 is mirroring. If you add another drive, you will not get more space, you will just get another copy of your data... and another... and another.
I'm not sure that btrfs would be any easier in this case, as the mdadm tools are pretty robust and certainly allow for adding and removing drives. But if you use btrfs it might actually be beneficial if you are set on keeping a RAID-1 type setup. This is because btrfs' raid levels are not quite like traditional raid. If you put your btrfs array in a RAID-1 setup with two disks, it is no different. But when you add another disk, it will continue to keep just two copies. So if you have a total of four disks, then it will still be only two copies of any given data, meaning that you will end up with twice the space of the two disk RAID-1.
Maybe you are thinking of a different RAID level altogether? If speed is not the issue but you care about redundancy and fault tolerance, then you might want to look into RAID-5 or RAID-6, though these require quite a few disks.
Ello',
I'm continuously going to be adding drivers to the machine, not to the same raid-1 array. My plan is once space gets tight, I'll add another disk and bump it up to raid-5

TimeMachine or RAID with internal iMac HDD?

I am thinking of getting an external SSD for use as my boot disk and then connecting it via Thunderbolt. Presently I have a 72rpm HDD and it's showing it's age, but it's 1TB and so will the external SSD, the move is purely for speed, on top of this I have an external 1TB HDD which I interface via tryst ol' USB2 and use that for TimeMachine back-up.
My question is whether to cut the chord with the external USB 2 HDD and use the internal HDD as a TimeMachine instead when running from SSD?
Either than or keep the external HDD as a TimeMachine back-up and use a RAID configuration so that if anything were to happen I could pickup from where I left off, but not sure about the performance hit, or if I could even do that (i.e. RAID from external Thunderbolt SSD to internal iMac HDD)?
There is another option and that would be that the Thunderbolt connected enclosure will have two bays and so I could fit in an affordable HDD for one of these suggestions. The benefit being that I would be able to forfeit one of the mains plugs (1TB is never going to be Bus driven!) and use it for the Thunderbolt enclosure.
I suppose my main concerns would be how to et up RAID with the different storage systems and if it would work, as well as the performance hit, I'm not sure what suffers when connecting SSD to HDD and having a real time backup system, if it's even worth it? I am making the SSD move for speed after all.

I forgot to mention that I may also consider encrypting my backup or RAID drive, any thoughts on that too?

Rman restore to windows server with different drive layout

I'm restoring to a server with a different drive layout. I'm using the set newname for the datafiles and it's working fine. However. My redo logs show that they are on the f: drive and the f: drive doesn't exist on the new server (recovery). so when I'm all done I get an error saying that it cant find the redo02.log. Any ideas?
TIA
Dave

no problem, thanks for the reply.
Here's what I tried in the init.ora
LOG_FILE_NAME_CONVERT=('F:\ORADATA\ORCQA08','D:\ORADATA\ORCQA08')
I didn't even create the spfile I figured I could do that later.
The datafiles alll go to the correct drive, here's my restore statement:
run
allocate channel disk_channel1 type disk;
allocate channel disk_channel2 type disk;
SET NEWNAME for datafile 1 to 'd:\ORADATA\ORCQA08\SYSTEM01.DBF';
SET NEWNAME for datafile 2 to 'd:\ORADATA\ORCQA08\SYSAUX01.DBF';
SET NEWNAME for datafile 3 to 'e:\ORADATA\ORCQA08\UNDOTBS01.DBF';
SET NEWNAME for datafile 4 to 'd:\ORADATA\ORCQA08\USERS01.DBF';
SET NEWNAME for datafile 5 to 'e:\ORADATA\ORCQA08\PLATDATA.DBF';
SET NEWNAME for datafile 6 to 'd:\ORADATA\ORCQA08\PLATHISTDATA.DBF';
SET NEWNAME for datafile 7 to 'd:\ORADATA\ORCQA08\TS_MV.DBF';
SET NEWNAME for datafile 8 to 'e:\ORADATA\ORCQA08\PLATNDX.DBF';
SET NEWNAME for datafile 9 to 'd:\ORADATA\ORCQA08\POADATA.DBF';
SET NEWNAME for datafile 10 to 'd:\ORADATA\ORCQA08\POABDATA.DBF';
SET NEWNAME for datafile 11 to 'd:\ORADATA\ORCQA08\POANDX.DBF';
SET NEWNAME for datafile 12 to 'd:\ORADATA\ORCQA08\TS_REPORT_DATA.DBF';
restore database;
release channel disk_channel1;
release channel disk_channel2;
i then do a switch database to copy and this registers the datafiles under the correct drive BUT when I try to open the database this is what i get:
ORA-00280: change 15613734 for thread 1 is in sequence #861
ORA-00278: log file
'D:\oracle\flash_recovery_area\ORCQA08\ARCHIVELOG\2012_08_03\ARC0000000860_07815
80447.0001' no longer needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
cancel
Media recovery cancelled.
SQL> alter database open resetlogs;
alter database open resetlogs
ERROR at line 1:
ORA-00344: unable to re-create online log 'F:\ORADATA\ORCQA08\REDO01.LOG'
ORA-27040: file create error, unable to create file
OSD-04002: unable to open file
O/S-Error: (OS 3) The system cannot find the path specified.
You can see that it's still looking on the f: drive for the redo log. Is my syntax correct?? - - LOG_FILE_NAME_CONVERT=('F:\ORADATA\ORCQA08','D:\ORADATA\ORCQA08')
I can get rid of the other redo logs by dropping them and recreating under the proper drive but 01 is the active log.
any other ideas?
Dave

How to buy and install mac os x 10.6 in a late 2007 mac book with no dvd drive?

i want to buy snow leopard for mac book with no dvd drive, but the only choice in app store is dvd copy, no digital copy!

You'd have to have someone with a DVD drive make a Disk Image of the DVD, have them Restore that .dmg to a Flash drive that's big enough, the boot the MB using alt key to choose to boot from the USB Flash drive.

Dual boot setup with two hard drives

Hi all, I've searched through the forums but haven't been able to find an answer to what I figure is a couple pretty easy questions.
My wife has an older G4(circa 2000) with OS 9.2.x on it now. What I would like to do is put a new, larger HD in the box and install Tiger on it. I've found write-ups talking about installing Tiger and OS 9.x.x on different drives or on the same drive in different partitions. My problem is I still am not sure how you switch between Tiger/OS9 with two different drives. Is Tiger able to recognize the OS9 on a different drive and allow you to easily switch back and forth like it does when they are installed on the same drive?
My second question is hopefully even easier. Can I head on over to my local computer supply store and pick up any old ATA HD like I would for a *Nix/Windows box or am I forced to get one directly from apple like I had to with a bad power supply?
Thanks in advance for the help all.

OK, here's mine for comparison:
ibook:~ michaelc$ bless --info /Volumes/*
finderinfo[0]: 3040 => Blessed System Folder is /Volumes/OS9.2/System Folder
finderinfo[1]: 0 => No Startup App folder (ignored anyway)
finderinfo[2]: 0 => Open-folder linked list empty
finderinfo[3]: 3040 => OS 9 blessed folder is /Volumes/OS9.2/System Folder
finderinfo[4]: 0 => Unused field unset
finderinfo[5]: 0 => No OS 9 + X blessed X folder
64-bit VSDB volume id: 0x233F23EAA912CD05So it would appear this might be the problem, since you don't have a "OS 9 blessed folder".
Now, I have never had to do this, but have seen it work for others. The bless command has a lot of options, many of which we don't want here. But let's give this a try. Remember, copy and paste this command into a text editor (TextEdit will do). Then edit the command to put your volume name in it (in place of <yourvolumename>, without the angle brackets), and copy and paste again into Terminal.
You will need to be logged in to an 'admin' account:
sudo bless -folder9 /Volumes/<yourvolumename>/System\ Folder/Press return and you will be prompted for your password. This is not echoed for security reasons: just type it and press return.
Then, if you get no complaints, I would issue a
rebootcommand. Your OS 9 System Folder should now be available to you in your Classic preferences screen.
Let us know how this goes!

Fan Speeds, and Mirror Raid with New Internal Hard Drive

Regards,
I recently installed and formatted a new hard drive in my PowerMac dual 2.3 ghz computer and I have a few questions.
1. Now that there are two hard drives do I need to do anything to ensure that the fan on my computer can keep them cool? I think the fans I have in the hard drive bay is enough, but I do not know if they will automatically set themselves to run properly. I can monitor the fan speeds and temp from iStat pro, but do not remember what level the temperature was before installing the new one.
2. Given that my new drive is a SeaDisc hard drive and the older one is a Western Digital, will this cause any problems in creating a mirrored RAID. I believe that both are 7200rpm drives, and my second hard drive is a little larger (I will just have unused space after making the RAID). I am concerned with the fact that these two drives are from two different manufactures. Will this cause problems or drastically slow down the reading and writing of data? Has anyone else experienced problems in making a mirrored RAID from two hard drives that are not exact matches, and even come from different manufacturers?
Any advice will help.
Thanks
earpshmael

Hi earpshmael;
Generally when creating RAID arrays the more similar the drive the less problems you tend to have.
The real question is exactly why do you want or need RAID?
I think so many people seem to think that RAID will solve all of their problem. I hate to tell you the bad news but it will not.
Generally there are to varieties of RAID available using the software RAID built into OS X which are 0 and 1. RAID 0 or stripling is generally for moving large file rapidly for applications like HD video. It usually doesn't help the OS. RAID 1 or mirroring is for protection from drive failure. It is not a valid backup solution.
Allan

Internal RAID 0 with 3 or 2 Drives

Hello, iv been snooping around the forums looking for info on various internal RAID set ups...
I do a lot of editing with FCP but a do a lot of complicated After Effects stuff too.
I am considering the following...
set up 1
3x 1TB drives, RAID 0
vs.
set up 2
2x 1TB drives, in a RAID 0
with the other bay used as a render drive.
my question is, with a three drive RAID 0 would my read and write times be faster or slower than a 2 drive Media drive and one drive dedicated to writing for rendering...
any shared experience would greatly be appreciated, or suggestions...
thanks
also i was considering the WD caviar Black drives, any good or bad expeirence with those?

Thanks for the links. i am considering this option...
sdd in the lower drive bay.
and some kind of raid with the other 4 bays... id like to do a raid 5 internally. is that possible without a controller, or how would i go about doing that?
i also had one other question...
i was thinking about getting this external LaCie 1 Tb rugged drive for my itunes, iphoto, you know things that do not have to do with current work, maybe finished projects(not project files but final renders), other private stuff.
my question is, would a 5400 rpm drive be fast enough for such tasks. like playing an uncompressed quicktime... the drive is only like 120 euros with esata and usb 2, but its only 5400 rpm. i like the OWC drives from the links you gave me, but i live in Berlin germany, and it would kind of be a hassel to ship all these drives... but i am going to the USA in like 3 months so i could wait if i need to...
any suggestions?

2 different drives on my RAID connectors?

I think I've seen this asked before, but can't remember the answer or find the thread, so I have to ask again:
I have an MSI 845 Ultra MS6398 with RAID connecters IDE3 and IDE4. I have hooked a 40gig Maxtor hard drive on IDE3 in a 1+0 array and it works fine. What I'd like to do is add an 80gig hard drive on IDE4 with completely different data on it. Is this possible, or advisable? If so, how do you make it happen?
Earl

Thanks. Toward the bottom of his write-up he says:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
To add more hard drives to either IDE-3 or IDE-4, you may repeat the steps from No. 5, ONE DRIVE AT A TIME, it's crucial to make sure the RAID BIOS detects each drive, set each drive as single disc array and NOT to mix with other existing arrays.
If any comments, problems and suggestions, feel free to post follow-up here.
with best regards,
Maesus
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX X
that "set each drive as single disc array and NOT to mix with other existing arrays"
is not crystal clear, but hopefully I can just follow my nose.
Earl

Backup up with TM at 2 locations, 2 different drives - FYI

In case anyone is curious about backing up a laptop to 2 different drives with TM when at 2 locations ...
The Scenario: I work at home a lot, as well as at the office - using my MBP laptop in both locations. At times I also travel. Up to now I've used Tri-Backup and Super Duper to do backups. At home I have a Mac Mini with several Firewire drives attached, and this acts as a file server for my Mac and my wife's. We both do backups to these drives. At the office, and when I travel, I use a large portable USB drive for backups. I also have a portable FireWire drive to make a bootable copy using Super Duper and carry around with me, just in case. [I actually had my laptop's internal drive crash while on a long trip and ended up using the bootable drive to boot from the rest of the trip - a real life saver!]
Now with TM, I wanted to do a similar thing - here's the outcome, in case you're interested.
I originally set up one of the Mac Mini's Firewire drives for the TM destination on Saturday, and after a lengthy all-night backup, my MBP continued doing the every-hour thing on Sunday. TM worked like a charm!
Today at the office, I used TM's preferences to define the portable USB drive as the destination. It began doing a new full backup and got that done (a bit faster than using the Mini's mounted drive over the home's network). Then it began the hourly backup. Before going home, I unmounted the external drive. At home I remounted the Mac Mini's drive over the network and changed over to it using TM's preferences. It soon began doing an hourly backup.
BTW, as long as I'm home, when a network backup is done, the drive is unmounted automatically and later remounted without my have to do it. However, when I get home and change the TM's destination drive, I do have to remount the Mini's drive manually so the preference window lists it. Then I can choose it and the laptop uses the network drive until I leave for the office the next day.
I occurs to me that I now need to do one final test - if I create a new file while at the office, and it gets backed up during an hourly backup, will it get backed up at home to the other drive? Or will TM think it got backed up once (and assuming it hasn't changed since) and it won't back it up again?
I'll report back.

This is a follow-up: Yes, TM can use two destination drives and keeps the backups straight.
I added a new file to the desktop and had an hourly backup take care of the file. Later, I switched to the second TM destination drive and did an hourly backup. The file was backed up again to the second destination drive.
So... If you use one TM drive to do backups at home or wherever using a remote mount and would like to use a portable drive to take on trips - you can set preferences in TM to use that portable drive for backups while on the trip.
And when you get home, you can go back to the network drive and have all new files created on the trip (that were backed up on the portable drive) re-backed up to the home drive. Sweet!

How can I set up a Mac pro with internal Raid 5

I have a Mac pro running Leopard server. I would like to format 3 of the drives as an internal Raid 5.
Can this be done?
Can it be done without an internal Raid card?
or
Can it be done if I install a Mac Pro Raid card?
Thanks,
RT

RAID5 or RAID10 or such does require add-on software and / or add-on hardware, yes.
And I'd tend to go toward external RAID storage here, as that is what the most common packages offer and as that tends to have the greatest expansion. This would involve a PCIe RAID controller and external storage here, though Apple does offer the Mac Pro RAID card for use with the internal drives.
The integrated Apple software RAID has RAID0 and RAID1 capabilities. Not RAID5.
As for any additional questions, here's [the FAQ|http://support.apple.com/kb/HT1346] for the Mac Pro RAID card, and here is [the manual|images.apple.com/server/docs/RAIDUtility_UserGuide.pdf].
External RAID can involve Apple Xsan and Promise and related, or third-party FC SAN storage, or any of various third-party direct-attach storage (DAS) options.

MacBook Pro won't boot with new hard drive, but a different MacBook Pro will

So here are the details. My friend and I both have 13-inch Mid 2010 MacBook Pro's. Same processor and specs since they were purchased at the same time, but originally had 250 GB hard drives. His hard drive failed and needed a new one. Put a 500 GB Seagate Momentus 5400.6 in his computer, and tried using a flash drive with "Install OS X Mavericks" on it to install Mavericks on his new hard drive. No matter what, it wouldn't install. I finally was able to install OS X 10.9.4 on it by connecting the new hard drive to my computer with a USB hard drive enclosure. I put the hard drive back inside his computer and it wouldn't boot (stuck on the gray screen with apple logo and a spinning wheel). I then attached to the hard drive to his computer externally with the USB enclosure, and then it booted and worked perfectly.
So, it seemed like the problem was with something inside his computer, but then I switched our drives, and that doesn't seem to be the case anymore. I put my original hard drive into his computer, and his new hard drive into my computer, and they both booted and worked perfectly, so I have no idea why his computer will not boot with the new hard drive internally.
To summarize, his computer boots with: 1) new hard drive connected externally (won't work if it's internal), and 2) my hard drive internally
but my computer boots with: 1) new hard drive connected externally AND internally, and 2) my hard drive internally.
Both hard drives have OS X 10.9.4 installed
If anyone has any idea what's causing this and how to make his computer work with the new hard drive internally that would be greatly appreciated.

So after switching the internal SATA cables from each computer, now we have
His computer, with my SATA cable:
1) Worked with every hard drive!
My computer, with his SATA cable:
1) Works with 1 TB Toshiba hard drive
2) Works with 500 GB Seagate hard drive
3) Works with my original hard drive
4) Flashing folder with question mark with his old hard drive
So it turns out you were right! Definitely had something to do with the SATA cables. But it's still strange that mine was able to boot with all the hard drives except the one that was originally in his. So it seems like it was some combination of his SATA cable and something else, since when his SATA cable was in his computer only 1 hard drive (my original) worked, and when it was in my computer, 3 hard drives worked. But at least its working, and I'm just gonna keep our SATA cables switched since that seems to work out fine

Internal RAID Drives Disappeared from Desktop & Finder

A few days ago, one of my two internal mirrored RAID sets no longer showed on the desktop or in the Finder Sidebar. A day later, the other internal RAID set disappeared from desktop and sidebar. The two remaining internal non-RAID drives show up as do two external drives. All internal and external hard drives still show under Disk Utility and Photoshop Bridge CS3.
I checked Finder Preferences and boxes are checked to show internal and external drives on the desktop and sidebar. I looked at the drive detail under Disk Utility and nothing looks wrong with the two RAID sets ON-LINE. I unmounted one RAID set and re-mounted without any change. I tried unchecking the two preference boxes to not show the drives and rebooted, rechecking the boxes and rebooting and nothing changed on the desktop or sidebar.
Does anyone have any suggestions to resolve this?

Well our invisible drives problem is resolved but it's not the solution that I'd hoped for.
We visited the Genius Bar at a local Apple store and they denied any knowledge of problems with invisible drives in Macs and discounted my reports from Mac forums.
I went home and ordered a new 1tb Seagate drive. When it arrived, I installed it in bay 2, copied each invisible drive to the new drive one-at-a-time, broke my two sets of internal mirrored drives, erased all the affected drives and reloaded them. Now all drives are visible on the Desktop and Finder again.
I'm hoping that the disappearing drive problem doesn't surface again but view this as an unresolved Apple issue. Now I can look at other mass storage options for future growth.

Internal RAID with 2 different drive makes

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