About: making RAID sets - partition independant?

(the querry made simple: look last 2 lines)
When making a RAID set, whatever the type it is, will it rely on the partitions or on the disk itself?
In the Disk Utility help it keeps mentioning "disk", and when I was about to create a set, it also asked me about "disk".
I have set up 2 partitions for the purpose of testing RAID for me, being about the same size on a big backup drive.
The drive itself also has a bit of free space filled with original files.
So I wanted to mirror, say, RAID test 1 and RAID test 2, both of them being on the same disk.
Will it work?
Or will it wipe my disk?

A RAID may be constructed using individual partitions on separate drives although using the whole drive would be preferred for speed. You could actually RAID multiple partitions on the same drive, but of course what would be the point.
I've actually used two drives each with three separate partitions and created three separate RAIDs of two partitions each. Not particularly efficient but it does work.
There is really no point to creating a RAID of two partitions on the same drive. And, certainly no point creating a mirrored RAID this way.
Any RAID you create with Disk Utility will erase the drives used (or partitions.)
RAID Basics
For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs. Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:
RAID Tutorial
RAID Array and Server: Hardware and Service Comparison>.
Hardware or Software RAID?
RAID Hardware Vs RAID Software - What is your best option?
RAID is a method of combining multiple disk drives into a single entity in order to improve the overall performance and reliability of your system. The different options for combining the disks are referred to as RAID levels. There are several different levels of RAID available depending on the needs of your system. One of the options available to you is whether you should use a Hardware RAID solution or a Software RAID solution.
RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.
Pros and cons
Software RAID is more flexible than Hardware RAID. Software RAID is also considerably less expensive. On the other hand, a Software RAID system requires more CPU cycles and power to run well than a comparable Hardware RAID System. Also, because Software RAID operates on a partition by partition basis where a number of individual disk partitions are grouped together as opposed to Hardware RAID systems which generally group together entire disk drives, Software RAID tends be slightly more complicated to run. This is because it has more available configurations and options. An added benefit to the slightly more expensive Hardware RAID solution is that many Hardware RAID systems incorporate features that are specialized for optimizing the performance of your system.
For more detailed information on the differences between Software RAID and Hardware RAID you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?

Similar Messages

How can I mount a Raid set (partition in an external drive)?

Hi,
I have 3 partitions in my external drive. I tried to create a concatenated Raid from 2 of the partitions. However, I end up with an offline Raid Slice (one of the partitions is under this slice) which is grayed out in Disk Utility.
When I try to delete the Raid Set, I get "Deleting RAID set failed. This RAID configuration is not valid" warning. When I try to erase the RAID volume, I get "Volume Erase failed with the error:The chosen size is not valid for the chosen filesystem." warning. I cannot mount the volume either.
So, I have 2 of the 3 partitions mounted. The 3rd partition (which is under RAID) is unmounted. Do you have any suggestions to have access to the 3rd partition?
Thanks.

Why are you trying to RAID two partitions on the same drive? Aside from the fact that it doesn't work it also makes no sense when you can simply create a larger partition by joining the two into one.

Apple RAID Utility Raid 0 one disk roaming making raid set not viable

Hello!
I have a problem with RAID 0. In the picture below you can see that one drive was set to missing and RAID set RS1 has been set to non viable. However all four drives(Bay1-4) are set to be verified with status good. However as can be seen from the picture Bay 3 is set to status: Roaming
I don't know what I can do here. There was some talk on other discussions but nothing that helped me
Thanks to anyone that read this and try to help me. If you need more detail I will be more than happy to give them to you.
http://shrani.si/f/G/Z9/1KO4CaVc/screen-shot-2012-10-17-a.png
http://shrani.si/f/41/yG/2o1mIfV/screen-shot-2012-10-17-a.png
http://shrani.si/f/3p/v/35kiFJyD/screen-shot-2012-10-17-a.png
http://shrani.si/f/1m/lg/KcXG8j/screen-shot-2012-10-17-a.png
http://shrani.si/f/1Q/ET/2UkxU4ml/screen-shot-2012-10-17-a.png
http://shrani.si/f/R/ma/6jYOaty/screen-shot-2012-10-17-a.png

An error with drive in bay 3 threw it out of the RAID, breaking the Striped RAID. You data will be very difficult to recover, since the data are striped on two different drives, and one of them is no longer part of that RAID set.
You now need to re-initialize the RAID set (which destroy what is left of the data) using the same or different drives, and restore the data from your backups if desired.
I recommend writing zeroes to every block on the troublesome drive before even thinking of returning it to service.

This disk doesn't contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.

As stated above. I get this when I try to resize my HD. Was having issues with BootCamp so I removed it and got this.
This disk doesn’t contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.

the same problem...
any help?

Vista won't install on a RAID set. ***SOLVED***

I just installed my new MSI 790GX-G65 system and I cannot install Vista (32-bit) on any type of 2 disk RAID set that I have tried to create. I can get the installer to see the drive(s) by loading the driver, but after partitioning and formatting, I get a message about "windows cannot find a valid drive for install" or something to that effect. I can install fine using IDE mode and just picking one of the drives. Any help would be appreciated.

Quote from: FrogmanTM on 09-August-09, 05:39:36
Well, I solved it! The problem was with the Vista installation process itself. It turns out that Windows reads information about the boot sequence from the BIOS of the motherboard. It looks at this information to understand what will happen when the system boots for the first time. If you have a USB drive connected to the system and it is listed in the boot config as a bootable device (in my case the BIOS put the USB stick as the second boot device, right after the CD drive, and the RAID volume was listed AFTER the USB stick) - you will probably see this error: "Windows could not determine if this computer contains a valid system volume."
To get past it, I had to re-configure the BIOS Boot options to NOT include my USB drive as a bootable device (or just drop the priority below whatever drive you will be booting from). You can also boot your system without a USB drive installed - not an option for me since I need to install 3rd party raid drivers.
Whew! Thanx for all your help, I am glad I finally figured it out.
Wow dude you're a genius for two days I've been searching and searching and searching wondering why my vista wont install onto my raid 0. I have a DFI board with a 760fx chipset, i have done all the bios updates and brand new raid drivers and to no avail. Found this post and voila. Thanks a lot. Such a simple fix usually the last thing you think of or not think of it at all.

Macbook Pro with Dual hard drives. Scratch Disk, Memory 64bit, Raid, Set Up Questions.

Hello, this is my first post.
I just upgraded from the original 2006 17" Macbook Pro to a refurbished 13" Macbook Pro 2.53GHZ 4GB Ram (2009 model).
I bought the MCE Tech Optibay and installed it (if you dont know anything about it, ask me, its amazing.) So now I have 2x 500GB 7200RPM Seagate hard drives installed.
I am running Snow Leopard, CS3, Lightroom 1.4.
I have the main hard drive set up with Snow Leopard and all the Applications. I keep all my files on external firewire 800 drives, except files I am currently working on.
The second hard drive is set up as a scratch disk for Photoshop CS3 and that is it.
I am looking to upgrade to CS5 and Lightroom 3 here within this month or so. Or if I get anxious, tomorrow, haha.
I want to know the best setup I can do with my current set up with CS3 and for my future setup with CS5.
Any info will appreciated.
-Would some kind of raid set up with my internal drives be better? How does raid work with scratch disks?
-If I upgrade to 8GB memory in my macbook pro, would I even see a difference in performance if I didn't have a scratch disk? Since CS5 and Snow Leopard can use more memory in 64bit.
I think thats all I have on my brain right now. I may have more questions, or I can guarantee I will have more later.
Thanks alot.

First the scratch. Like you said, most everyone has a different take on scratch discs but I'd guess you're wasting one heck of a lot of hard drive space using all 500 GB for Scratch, did I read that right? If I did read it correctly YES, partition it and get some use out of it!!
I've got a unibody MBP 2.93GHz, OS 10.5.8, CS3 & PS 5 (running in 32bit mode), and 8 gigs of ram. I've partitioned the one 300 GB drive so 50GB is scratch, the other partition is for OS, & Apps, and documents (images).
I use LR 2 first than export to PS 5 to finish up. My photos get to be 300MB to 500MB in size and both versions of PS work on this setup just fine. Using PS 5 in 64 bit mode is faster opening files but NON of my plugin's are 64 bit yet, that's why I'm still stuck in 32 bit mode.
Not knowing what size or kind of files you work on makes giving advice a bit tough but try setting the status indicator (don't know the right name for it) in the bottom left corner of any PS open file to "Efficiency" and watch what happens when you process your files. I rarely see mine drop below 90%, I've got the usable RAM in PS Prefs set to it's max suggested, cut way back on History and Cache.
Can't wait for NIK and others to offer their plugin in 64 bit, later this year is what I was told.
There used to be an old "rule of thumb" with old version of PS about Scratch disc size. I don't remember exactly but it may have been 3 to 5 times the size of your biggest file??
Good luck, Alan

Mirrored RAID set deletion

Hi all,
I've set up two USB disks as a mirrored RAID set connected to my MacBook.
Now, I want to remove this RAID set (since it doesn't work so well for me).
In the manuals, Disk Utility is said to split nicely a mirrored RAID set, resulting in two disks with the same contents, when removing a mirrored RAID set.
However, when I try to do it, Disk Utility warns me that all data on the disks will be lost (which should not be the case...).
I can't afford to loose all data (120GB of photos), and I can't easily make a backup (120GB of data is tough to backup !)
Who should I trust ? Disk Utility or the manual for Disk Utility ?
Will my data be lost or not when I delete this mirrored RAID set ?
I need an authoritative answer... Could someone help me ?
Thanks,
Chris

Thanks for your advice... but if no RAID disk is plugged in, the RAID does NOT show in Disk Utility.
As I understand it, the partition scheme is different when using RAID... So a disk that is part of a RAID set has to be modified to get out of the mirror...
But it seems Disk Utility cannot disconnect a single disk from the RAID.
My RAID is now out of sync, and I won't attempt to resync it again...
So I would like to remove the whole RAID thing, and just get two disks, one that will be reformated, and one where all the data should be kept...
Later this week, I'll have access to another (afaik Firewire) disk... So I'll make a backup and simply try to delete the RAID... If it goes wild, I'll have that backup to recover.
I'll keep you posted if I can.
However, things should be made clear somewhere : either in the docs or in Disk Utility... I submitted some comments about the documentation on apple's website.
Bye
Chris

Problem Rebuilding RAID set with 10.5?

I have 1 RAID set (mirrored with autorebuild) composed of 2 (identical) HD. I got a message in 10.5 Disk Utility that one disk had failed and that the set was degraded.
I replaced the drive and I am getting an error message during the rebuild "Unrecognized filesystem".
I can still see and access my RAID set (1 slice still ok) so minimal damage here but I don't understand why I am getting this error message when trying to rebuild.
Any idea?
Thanks
setup:
-mirrored raid set
- autorebuild selected
- 2 slices (160Gb, GUI, OS journaled ext)

Hi VK2CPJ,
Today ( I slept on this idea was exhausted from previous day) tried on two blank eide drives in a raid box, no raid built just two independent drives, one set for master the other slave. A couple of observations:
I did not raid because I want one small partition to contain a Leopard boot install from the DVD. The message I received from disk utility was that if I restore that DVD my raid may be unusable(if I did raid). So I did not raid the drives but let them stand as master and slave. I wanted to do a APM on the small "boot" partition to see if my intel and PPC Mac would in fact boot from that restored Leopard DVD boot partition. I used start up pane on both PPC and intel and they would not boot up from that Leopard partition even though the start up pane showed the disk as a startup device. Using the option key booted both Macs. Now I'm not sure if doing this was to procedure because the Apple docs says to use a PPC Mac to do this process. Which I have a difficult time to understand. I'm assuming that the doc says that because APM would be default and assisting the user not to make any option mistake. So currently I'm trying this same procedure using a PPC Mac to test out whether start up pane will boot both Macs. I don't think it will but do think using option within the start up manager will work. If so then does this mean imply that the start up pane has a bug or that user does not require a PPC Mac to do the setup process. Let you know shortly.

CREATING A STRIPED RAID SET

Can anyone help?
I'm new to Final Cut Pro and trying to set up a Striped RAID Set with three internal 500 gb drives...
I assume I should set the Volume Fomat: Mac OS Extended
and RAID Type: Striped RAID Set
Should I leave RAID Block Size at 32K or higher for video?
Should I partition this RAID set or leave as 1.5 tb (approx)?
(I plan to be doing most of my work in DV with some SDI)
Any and all help will be greatly appreciated!
Todd

We talked about this very thing no too long ago here... it was concluded with setting the RAID block size to as large as you can, and I'd not partition it at all. (Don't see any gain in doing it - only disadvantages)
Jerry

Upgrading Xserve with RAID set

Hi,
I have been asked to upgrade a copy of Server 10.3 to 10.4. I don't like upgrading, so will do a clean install and then restore all of the SA and WGM data back into the server. Here is the question:
The XServe has 3 bays - bay 1 has the startup disk and bay 2 and 3 have a mirrored RAID set. Is the RAID config data held in the OS, so if I reinstall the system will the configuration data for the RAID set be lost and will I have to re-RAID the server? Or is the config data stored on the drive and so a re-install won't affect the RAID set?
Many thanks,
JS
iMac G5 17" 2 Ghz, 1 GB RAM, 600 GB HDD Mac OS X (10.4.9)
iMac G5 17" 2 Ghz, 1 GB RAM, 600 GB HDD Mac OS X (10.4.9)
iMac G5 17" 2 Ghz, 1 GB RAM, 600 GB HDD Mac OS X (10.4.9)

I would like to know if the RAID 'config' data is
actually written onto the drive or is stored in the
OS. I first thought it would be stored in software
because Disk Utility uses software RAID, but then
again a single drive has the partition data on the
drive.
James,
If you think about it a bit, software RAID information has to be on the drive because the volume becomes a RAID before a filesystem is created and before an install is done. Likewise, a hardware raid is done on the interface card and comes up the same way. Neither can know which of the members of the mirror are available at first boot; otherwise, there would be a single point of failure during boot, and the whole purpose of a RAID 1 mirror would be lost.
The bootstrap starts on the mirror primary, then, as the driver is brought online and before any writes are done, the driver collects the members of the RAID 1 mirror set and forms the mirror. If the mirror primary isn't available, then the mirror secondary is used (which has an exact copy except for stuff indicating that it is the secondary). All this happens normally during boot, as if from a single non-RAID drive, until the cutover is made to RAID early in the driver intialization.
That's why booting from a RAID 0 (stripe) is so hard - all of the data is not present on a single drive. It can be done, but it is hard and requires special care during the boot.
You really do want to make the upgrade to AppleRAID 2 before spending time on the update, though. There are details in this article on afp548.com:
http://www.afp548.com/article.php?story=AppleRAID2-in-Depth
Russ
Xserve G5 2.0 GHz 2 GB RAM Mac OS X (10.4.8) Apple Hardware RAID, ATTO UL4D, Exabyte VXA-2 1x10 1u

Mac Pro (2009) RAID Card - Can't create RAID Set

Hi Everyone,
I have a Mac Pro 4,1 (Model 2009) running Mavericks 10.9.2. with the Apple RAID Card installed. I got 4 new SAS Drives (Dell Toshiba MK2001TRKB) which I'm trying to configure into a single RAID5 set.
OS X detects the individual drives and with Disk Utility I can partition and/or format the individual drives. However when I try to create a RAID5 set using RAID Utility, the card won't create the RAID set. Ik keeps on showing the white-blue stripped progress bar. Tried creating a RAID0 or RAID1 with just 2 drives, but the card just doesn't create a RAID set.
Anyone got a clue why this isn't working?
Thanks,
Sander

Manualy erased all 4 the drives and it worked instantly. System is now initializing the volume :-)
Still a bit strange. All 4 the drivers where brand new. I did some further testing and if I select the partion tab and just create a new partition on each drive, it still doesn't work. I have to select the erase option in Disk Utility and just do a simple erase on each drive in order to be able to create the RAIDset.
Anyway, Thanks for the advise; performance even during initializing is pretty fast. I'm curious to see what kind of performance I get aftet the initialization is completed.

Mac Pro 2009 Raid Set Lost after Hard Reboot

We have a newer Nehalem based Mac Pro with a 2009 Black Apple Hardware Raid card. The Hard Drive Configuration is: 4 x 2TB Western Digital drives setup as a Raid 1+0 array providing 4TB of space with what we believed to be optimal performance and redundancy. We had two volumes / partitions configured on the array, one 120GB for the OS and the remaining 3.8TB for data.
Everything was working fine when the server froze up. ON the Screen an error message said there is a problem with your Raid controller, Please open Apple Raid Utility.. Unfortunatly when we tried to do that we just got a spining beachball. We tried to open finder and it beachballed. We tried to force quit and nothing working. Finally we were left with no choice but to do a hard restart of the server and turn the machine off and then back on.
When the server came back on it would not boot up. We were greeting with the Folder with a Queston Mark. We booted from the Mac 10.6 Snow leopard Server Disk and opened up Apples Raid utility software. Much to our shock the Raid Set and the two Volumes were not shown in the Utility. However all 4 of the drives were listed and all being shown as Green light good status, but listed as "Roaming". We weren't sure what to do, the volumes weren't accesible since they didn't exist, the Raid set wasn't there, there was no way to run something like Data Rescue Recovery software. We tried calling Apple and have to wait until they open this morning. After looking online at various forums we came accross this problem with no solutions. Most of the people with the problems had the older 2006 Blue Raid card, and this appeared to be a common issue amoung others with the older card. I decided to try and re-create the Raid 1+0 set. However as soon as I did that I was prompted by Raid Utility that the drives I was selecting to use for the Raid set were already a part of another raid set and using them would delete the data on the set. I obviously canceled the process. Crazy enough the system knows the drives belong to a Raid set but doesn't realize it should know what the raid set information is.
We were using Mac OS 10.6.7 Snow Leopard Server, and I even tried installing and updating an external drive with 10.6.7 Server and booted from the drive from the machine and try to run Raid Utility. That did not work either. Any advice from anyone would be awesome. I'm worried what Apple is going to say when I do get a hold of them, the system is under Apple Care warranty. Thanks in advance for anyone's time.

I haven't lost data, but in my 2010 Mac Pro with 2009-vintage Apple RAID card, it has this Really Annoying Habit of constantly losing Disk 3 (the spare) in my 4x2 TB internal RAID5 array whenever I have to do a hard reboot.
I keep having to re-mark the now-"Roaming" drive as a Spare and then wait 8+ hours for it to rebuild the array ... grrr.
I saw an Apple KB article that suggests removing the Roaming disk and re-inserting it. Duh. Fat lot of good that did. Really wish there was some answer to this issue ... hard reboots should NOT cause array disks to go from "Assigned"/good to "Roaming"!

Advice on RAID Sets, Volume Sets, and RAID Levels of the Volume Sets using an Areca Controller

I have read through a lot of information on disk usage, storage rules for an editing rig, users inquiries/member responses in this forum and I thank each and every one of you – especially Harm.
In building my new workstation, I purchased five (5) WD 1T, 7k, 64M SATAIII hard drives and an Areca RAID card, ARC-1880ix-16-4G, which I plan to use primarily as my media/data disk array. The workstation will use a 128GB SATAIII SSD as the OS/program drive and I will transfer two (2) WD Raptor/10k SATA 70GB drives from my current system for pagefile/scratch/render use. I tentatively plan on using a mobo SATAIII port for the SSD and mobo SATA ports with a software RAID (level 0) for the 10k Raptors.
In reading the Areca Instruction manual, I am now considering exactly how I should configure the 5 physical 1TB drives in terms of RAID Level(s), Volume Sets, and RAID Sets. I must admit that I like the opportunity of allowing for a Dedicated Hot Spare as I am generally distrustful of the MTBF data that drive vendors tout and have the bad experience in the past of losing data from a mal-configured RAID array and a single drive hardware failure (admittedly, my fault!).
In line with the logic that one doesn’t want to perform disk reading while trying to write at the same time (or vice-versa), I am thinking the approach above should work OK in using the mobo disk interface and both software and external hardware RAID controllers without having to create separate RAID level configurations within a Volume Set or further dividing up the physical drives into separate RAID sets. I know in forum messages that Harm noted that he had 17 drives and I could envision a benefit to having separate RAID sets in that situation, but I am not at that point yet.
To some degree I think it might be best to just create one RAID Level on one Volume Set on one RAID Set, but want to solicit thoughts from veteran controller users on their workflows/thoughts in these regards.
Anyone care to share thoughts/perspectives? Thanks
Bill

Thanks for the speedy feedback Harm - I appreciate it.
I was thinking RAID level 3 as well.
Of course, it's always something! I purchased the Caviar Blacks by mistake - which are non-TLER. I will work with EggHead to return the ones I purchased and replace them with RE4 versions as I'm not thrilled about the possibility of the controller declaring the volume/disks degraded unnecessarily and although I have the DOS utility WDTLER where one is supposed to be able to enable/disable TLER on WD drives - I suspect WD is way beyond that now anyway with current builds.
I agree with you about just testing the performance of the options for the raptors - on the mobo and then on the controller. When I benchmark them I'll post the results in case others are curious.
Thanks again....off to EggHead!

How can I temporarily remove a RAID set but keep the data?

I recently had to restore my Netgear ReadyNAS to factory settings, which meant that I needed to make a backup of its data and restore it afterwards. The only possible way to back up the 8.5Tb of data was to get 9Tb of WD Red disks and somehow use them - so my immediate thought was that the Mac Pro would be a good idea. I t had four drives in it, but three of them were not being used by the OS so they could be temporarily removed.
So I replaced three of my four Mac Pro drives with new 3Tb drives and used Disk Utility to set them up as a JBOD. I then used this JBOD drive to back up the NAS and restore it again after I had re-installed its O/S (the whole thing took two weeks!!!).
So now I'm in the following situation:
* I want to tear down the JBOD set and take the three new drives out of the Mac Pro again and replace them with the drives I normally use there so that I can go back to making music (which is what I usually use it for).
* I also want to be able to put the new drives back in and read the data as a JBOD again if needed (in case anything is discovered to be amiss with my ReadyNAS backup/restore operation) - let's say for the next month I'll plan to keep the old drives around for safety.
How can I remove the JBOD set in such a way that I can set it up again using the same drives, and access the data (i.e. I don't want to delete the RAID set the usual way because that will delete the data too - apparently...)?

Going to ask the mods to move this to MacPro, Hatter can answer your question, but I'm pretty sure if you power down and remove the RAID drives, you can put them in back again and boot up and the RAID will still be recognized as the info is stored on the drives themselves in the GUID/MBR of each drive in the set.
Also you should know, there is a new MacPro coming and it doesn't accept internal drives, only external.
So you should prepare and have some sort of external hardware redundancy for your data that isn't dependent on the Mac HFS+ formatting as Windows doesn't read that.
Perhaps exFAT would be better as both platforms can read/write that, but if the drives are going to be used with a PC ever, they need to be formatted by Windows for exFAT to get it right. Check first before you commit to copying huge data over.
Anyway research it, because if your MacPro dies, you might be up the creek and have some issues getting at all that data since it's in a RAID, external options might not work correctly or reliably for RAID.
Also consider talking to the fellows at MacGuru's, they are external RAID box setup experts for Mac's, sounds like you need a RAID 5 box, gives redundancy and can connect to any computer.
Hardware RAID is more reliable than software ones, cross platform as well.
good luck.

RAID Set not showing up - 3 severe events

Intelle Xserve running 10.6 RAID Card running firmware v E-1.3.2.0, Two it drives set up with I think RAID 5.
The main person for the system is away as well as his backup. So I'm running on very little information at the moment.
Log:
Called in due to user not able to access shared files (Also shared FileMakerpro databases and Portfolio server). Only access to server was via screen share.
Could not connect. After trying all that I could, powered down the server. Restarted, got a login startup permissions error for an item to run at startup. (I'll have to check what exactly that was). Started the Portfolia server and the FileMakerpro databases. Users able to access and use.
Next day same thing. User lost connection with the server. Restarted, start filemakerpro databases and portfoilio services. User able to access.
I suggest pulling over the files needed to work just in case it looses connection again, User starts to pull over some files which is transfering.
About 15 minutes later I get a call that the user lost connection again.
Restart the once again. This time get errors from the RAID utility:
Non-viable RAID set RS1 and all associated volumes are offline
Drive 3:500 missing - Replace immediately or acknowledge loss of RAID set RS1 and associated volumes
Drive 3:500 missing - Previous drive status was inuse
The RAID utility does not show a RAID set.
The drive appear to be OK
The drive shows up on the desktop but when I go into the drive the folders etc are showing. Access the main folder results in a loop where it bails out and just shows the desktop again.
I'm going to get some files to the user from the timemachine backup for now.
Is it possible that the data is OK and maybe the drive are marked off line for the set but still OK?
Any info would be great,
Thanks

Yes the 160GB has the OS. I'm coming into this cold as the main person and the backup are currently away.
I have got the users a work around so they can do thier work. The backup person has very limited email contact and he had thought it was a RAID 5.B But I would agree this looks to be a RAID 0 or 1 since there are only two drive available for data.

About: making RAID sets - partition independant?

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