Help on Setting up Xserve Raid

In our department we have three MacPro's, and one G5 Quad. We want to add an Xserve Raid to store and serve hi-res image files to each workstation. There is a company wide network (intranet) to which we have aready added the workstations, along with printers, however our IT people do not support the Mac platform and we are on our own as far as getting the Xserve Raid in the mix.
I am looking for advice as to how best to set it up and what sort of addition hardware or software we might need.
MacPro   Mac OS X (10.4.8)   4gig ram
MacBook Pro   Mac OS X (10.4.7)  

I'd concur that it's generally a bad idea to use a production machine as a file server. OS X is fairly stable though. Worst case will likely be you'd loose the file server if an errant application hung up the finder. I can't remember the last time I've had an OS X box lock up solid.. though they do occassionally become unusable from the console.
If you're really budget constrained, put it on the tower. Just be careful about the Fibre controller. Apple has made PCI-X and PCI-E versions over the years.
As far as whos controller to buy, Apple's isn't just competative, it's a steal. It's a 2Gb/channel controller and it runs over Copper (not real fiber optic). You can find cheaper FC cards but they are 1Gb per channel. There are also 4Gb per channel cards.. these will generally fall back to 2 or 1 Gb per channel but they are VERY expensive. FC has come down a lot but it's not unusual to find cards with the same specs as Apple's for twice the price. At least one of our sys admins puts Apple's cards in his x86 Linux servers because they are the cheapest cards he can get. (they also work in Windows 2003 machines since they are just rebranded cards from another vendor.. we're running one in a Dell next door.. as a test for the XSan we're building).

Similar Messages

  • Problems with Xserve RAID

    I have been having problems with Xserve RAID, which happened in a close time span, but may not be related. The Xserve RAID is set up with 7 disks with RAID 5, totaling to 1.3TB in storage capacity.
    First, the first disk failed and the RAID system was degraded. Since I got a very similar 250GB harddisk (but without "Apple Firmware") I tried putting it as a replacement. It was recognized but it became a hot spare disk, even though I did not set the system to use hot spare.
    Later Mac OS X reported that the Xserve RAID's 1.3TB volume was unmounted. I check with Disk Utility, and it reported a lot of errors. I ended up with about 70GB of files in lost+found, and I confirmed that many files were missing. Disk Utility could not really fixed it.
    I put back the failed disk, and Xserve RAID successfully rebuilt the array. I did "Background Array Conditioning" to perform surface scan and mapping of bad blocks. It completed without error. I then did "Verify Parity Data", and it completed but with error, as follows:
    Event:
    Disk 5 Reported An Error. COMMAND:0x37 ERROR:0x64 STATUS:0x81 LBA:0x119E6880
    Description:
    The drive reported ATA error. This is a failure in the communication from the RAID Controller to the drive.
    Any idea what is happening with this Xserve RAID? Bad disk? Bad controller? Or what? Any help is appreciated.
    Thanks,
    Xserve RAID Dual G5 2.0GHz   Mac OS X (10.3.9)  

    After reading here and there on the net (including this forum), yes I realized that the "Apple Firmware" thing may be significant after all. But since I set the Xserve RAID to use RAID 5, a failure of one disk should not affect data integrity. And surface scan was successful, implyingthat all disks are now free from defects. So why did it lost 70GB worth of data? I experienced disk hardware failure often with Windows system but never experienced losing data while the hardware seems to be fine. Without knowing why this happened, I feel scared to put data on Xserve RAID, and this is ironic since this 1.7TB Xserve RAID is meant for storing data safely...

  • Basic Xserve Raid Set Up Help

    Please excuse the newbie question I have looked on the forum and cant quite find the info I need.
    Can someone give me a step by step guide to setting up an Xserve raid please.
    We have 2 G5s each running Final Cut Pro. We have just purchased a 7TB Xserve raid from Apple Refurb.
    We would like a very simple set up where each G5 uses half of the Xserve. We do not have a fibre switch at this point - we do not need to share media however we will add this later.
    So our initial requirement is a very basic 2xG5 each with a single fibre connection to each half of the Xserve. Sounds easy but . . .
    We connected one of the G5s to both fibre ports in order to just set up the drives, once done we will simply disconnect one fibre cable and connect to the other G5.
    We thought that the Xserve would be pre-configured to raid 5, which is what we would like to use. However upon connection there was a message that the drives were not readable and needed to be initialised. (the standard apple message if drive is not formatted)
    We ignored this message and went to the drive utility to see if we could mount the drives and although it sees two drives, (each just under 3TB) as you would expect, it seems they are not mountable. (Since the drive utility saw 2 drives I assume that they are preconfigured to a raid)
    So I looked in the raid utility and the only option is to 'add system'. If I click this I get a dialogue box asking for address and password. I understand the 'private' 'public' password and used the host computers IP address as there is no network.
    I thought that this would take us through to the set up that allows you to create arrays and raid types etc.
    So I am a bit stuck.
    If the drives are preconfigured to raid 5 how can I mount them ? as that would be the simple config we need.
    Or do I need to start from scratch ? Hence my request for a step by step guide.
    best wishes and thanks for your help in advance
    Neil

    I can't speak to exactly how the Xserve RAID comes from refurb but in general there are two steps to using the RAID.
    1) Create the RAIDs on the machines. (This takes some 30+ hours.)
    2) Format the new volumes. (This takes 2 minutes.)
    Assuming the RAID came configured RAID 5 on each side and *you didn't shuffle the drive order* then they should still be configured and available that way. Apple doesn't assume that you are going to use the Xserve RAID with HFS+ formatting - they don't even assume you're going to use it with a Mac so I think the volumes are probably unformatted. My guess is that you are between steps 1 and 2 and you will need to choose the volumes in Disk Utility and format them to HFS+ (but probably not journalled if you are doing video work) and partition them.
    You can get and set the actual RAID information using the Java tool RAID Admin.
    You can (and should) connect to one of the ethernet ports on RAID unit, but the computer you connect will need to be in the same IP range (probably 169.254..) to get to the first time and run RAID Admin. This is how you can set-up, tweak and check the status of your RAID through software. This is also where you can set the IP of the RAID to be more in-line with your computers local network if you're using something different.
    HTH,
    =Tod

  • Xserve-RAID set up

    I am a photographer and I am setting up an Xserve RAID system that I have had for a little while to store my photographs. Can anybody help suggest the best RAID level. My sense is telling me that for photographs I need to Mirror so Level 1. I have 7 drives so can I mirror a set of three drives which takes up 6 drives and have one drive left as a "hot Spare"?
    Thank you for your time....

    Why do you want to mirror your storage?
    Without more information I would suggest RAID 5 by reflex. It will give you the most storage - a 6 disk RAID 5 will give you disksize* 5 storage and it will protect your data if a drive fails. And if a drive fails the 7th disk hot-spare will be automatically be used to rebuild the RAID data.
    You will not be protected if more than one drive fails simultaneously - that's what back-up is for. Mirrored RAID is NOT a back-up plan. It will not protect you against disk corruption or accidental deletion (that will be mirrored immediately) nor does it protect you against water being poured on the RAID box or someone stealing it or fire or whatever... Only back-up protects you against these things.
    There are legitimate reasons to run mirrored RAID but back-up is not one of them. If your reasons are sound (and you are doing back-up in addition to mirroring) then your plan is certainly doable but make sure your reasons are the right ones.
    HTH,
    =Tod

  • Xserve Raid Crash Course Help Needed

    We received two Xserve Raids loaded with 250 gig hard drives, fiber Channel Cards, all cables etc. We are a very small animation company. Is there any manuals or web pages to help us get started and learn how to set this equipment up? Apple manuals do not tell much, Thanks

    Hi
    http://manuals.info.apple.com/en/XserveRAID_UserGuide.PDF
    http://support.apple.com/kb/HT2760?viewlocale=en_US
    http://support.apple.com/kb/HT2758?viewlocale=en_US
    http://docs.info.apple.com/article.html?artnum=51795
    http://manuals.info.apple.com/enUS/RAIDAdmin1.2121406.pdf
    http://www.apple.com/support/xserveraid/
    I can only speak for myself but all of the above is what I've used and I've not had too many problems. It's advisable to purchase a UPS if you haven't already got one.
    The host machine does not have to be an XServe.
    Tony

  • Proper procedure for replacing drive in Xserve RAID RAID5 set

    I've got a five-drive RAID-5 set (with a sixth hot spare) in an Xserve RAID running the 1.5/1.50f firmware. One of the drives in the RAID-5 set has an amber/orange status light on and has been getting occasional errors like to following:
    Timestamp: 11/10/10 10:34:53 AM
    Priority: Warning
    Controller: Upper Controller
    Type: 112
    Event ID: 1000
    Event: Disk 5 Reported An Error. COMMAND:0x35 ERROR:0x10 STATUS:0x51 LBA:0x19B80
    Description: The drive reported an ATA error. This is a failure in the communication from the RAID Controller to the drive.
    I have double checked the drives in RAID Admin and, as the drive is only in a warning state, the hot spare has not been pulled into the RAID set yet. As this is an old drive, I'd like to replace that particular drive first. I have a current, full backup of the data, but want to make sure I understand the process correctly.
    I understand the "Installing or Replacing an Apple Drive Module" section of http://manuals.info.apple.com/en/XserveRAID_UserGuide.PDF, but it and RAID Admin's built-in help don't describe what will happen when replacing a drive in a RAID set that has a hot spare. When I pull out the drive and replace it, will it correctly use the newly inserted drive or will it use the hot spare? If it uses the hot spare, will the hot spare revert back to a hot spare once the new drive is inserted or will it permanently become a member of the RAID set and need to be moved to the original drive's slot? Or, should I just pull out the hot spare, pull out the failing drive, and pop the hot spare into the failing drive's slot?

    Hello, makkintosshu, and welcome to the AppleBoards,
    If you pull out the drive the RAID should/will immediately start rebuilding using the hot spare. The hot spare will become a new permanent member of the RAID and the new replacement drive will become the new hot spare. The physical slot locations of the drives don't matter you can build a RAID from any combination of drives as long as they are on the same side.
    If you pull the hot spare and then the failing drive the RAID will wait for a new drive before taking action. I find it hard to recommend this course of action unless there is a really good reason for you not wanting the hot spare to become part of the RAID. Rebuilding is going to take a good long while and you want it to start as soon as possible - as long as the RAID is not rebuilt your data is at risk. Letting the RAID rebuild hang as you physically swap out the failed the drive strikes me as bad idea that needs a really good justification.
    HTH,
    =Tod

  • Expanding XServe RAID set - stuck at 99%

    We have an XServe RAID.  One side had a RAID 5 set consisting of 6x500GB HDD's.  We came to within 60Gb of filling it up and therefore initiated expansion of RAID set to 7th drive on Saturday.  This was progressing 1% / 40 mins.  We calculated that it would not complete before Monday when users would start hammering it, but after testing it, it seemed to be working perfectly fine while expanding.  Writing/reading speed did not seem to be noticeably affected and we decided that all seemed well.
    Monday started off well.  Not not a single user noticed reduced speed or any other problems - This was until about 3pm when the file server hosting AFP & SMB crashed!  Not good!  Upon restart, the RAID set would not mount again.
    RAID Admin shows the expansion at 99%.   I was hoping that the RAID set could be mounted again once it completed to 100%, but it does not seem like this will be happening anytime soon - it has been stuck on 99% for about 6 hours now and I don't know when/if it will ever finish.  (Previously 1% every 40mins)
    The fibre channel preference pane shows "Link Established" to the XServe RAID, similarly the RAID Utility shows "Link Up" to server.  The RAID, however, does not appear in Disk Utility - even after restarts.
    Does anyone out there have experience expanding a RAID Set on an XServe RAID?  Does it usually stall at 99%?  How long does it take to finish once it has reached 99%?
    Is there anything I can do to try and get the RAID Set mounted before it finishes its expansion?  It's now 8pm here (GMT+8) and users have finished for the day, but we only have about 12 hours before it needs to be up and running again!
    I am out of ideas to try.  Any help would be greatly appreciated.
    Thanks

    Curiously, more output from the above-mentioned 3rd party tool gives:
    $ ./xserve-raid-info
    Use of uninitialized value in string at ./xserve-raid-info line 655.
    Use of uninitialized value in string at ./xserve-raid-info line 655.
    Use of uninitialized value in string at ./xserve-raid-info line 655.
    Use of uninitialized value in string at ./xserve-raid-info line 655.
    Name: Xserve-RAID
    States:
      RAIDs: optimal
      Components: optimal
      Fibre Channel: optimal
      Network: warning
    Warnings:
      The top network link is down.
    Upper Controller Info:
      Status: ok
      Firmware Version: 1.5.1f2/50
      Up Time: 262 days 1 hr
      Temperature: 75.2 deg F
      Write Cache: disabled
      Prefetch Size: 8 stripes (512 KB/disk)
      Fibre Channel: link up
        Topology: arbitrated loop
        Speed: 2Gb/sec
      Network: link down
        IP Address: 192.168.30.11
        Subnet Mask: 255.255.255.0
    Lower Controller Info:
      Status: ok
      Firmware Version: 1.5.1f2/50
      Up Time: 262 days 1 hr
      Temperature: 82.4 deg F
      Write Cache: disabled
      Prefetch Size: 8 stripes (512 KB/disk)
      Fibre Channel: link up
        Topology: arbitrated loop
        Speed: 2Gb/sec
      Network: link up
        IP Address: 192.168.30.21
        Subnet Mask: 255.255.255.0
    In RAID Admin, I've added systems using 192.168.30.11 (supposedly - link down).
    I can NOT connect using 192.168.30.21 - it says incorrect password even though I know I am entering the correct one...

  • Looking for some ideas for setting up and xServe RAID

    Everyone,
    Here is what I would to do. I have a new xServe and 7TB RAID. I would like to set all of my end users up with Portable Home Directories. They all have laptops and I would like to use their PHD as my backup source. I would set them to sync in the background a couple of times per day and then write to tape at night.I have about 60 end users. I would also like to use the same xServe and RAID as my Kerio mail server and mail store. What I am looking for is some ideas of how to go about setting up the RAID. I was orginially thinking of setting up as one big RAID 5 using all 14 drives. What I would like to know is what is the number of drives that would need to fail that would render the RAID unrebuildable? I am now thinking about splitting the RAID into two 7 drives in RAID set up as RAID 1+0.
    I am not sure if I phrased a lot of this currently, but here is quick recap of what I would like to know. What would be the best way to set up a 7TB RAID to store PHD and my Kerio mail store that provides me the most redudant and fastest acccess.
    Thanks in advance.
    Sincerely,
    Daniel Krajc

    Daniel,
    I'd suggest a 6 disk RAID 5 plus a hot spare for each side. It will give you about 2.4 TB capacity per side (4.8 total), and it can tolerate 2 drive failures per side without losing data, provided there is sufficient time between failures for the RAID set to automatically rebuild on the hot spare. This window is 8-12 hours.
    Note with Xserve RAID the two sides are totally independent in the data path -- it will look like 2 separate LUNs. If you want to combine these at the host level, as RAID 0 or RAID 1 to look like a single volume, you can. But the Xserve RAID will not combine them itself... the RAID controllers are independent... it might as well be two separate RAID volumes in the same chassis.
    I assume you'll plug this into an Xserve that is serving as an Open Directory server and a file server?

  • Xserve raid midplane(?) troubleshooting help

    Hi,
    I just inherited an XServe RAID with 12 180GB drives. My question is thus:
    If I put the single RAID controller in the top slot, It recognizes all drives on the left side of the RAID, which is expected
    If I put the single RAID controller in the bottom slot, it does not recognize any drives in any slots even if I swap those drives from the left side to the right (to rule out 5 bad drives.
    I have two empty sleds that are on the right side of the RAID as well.
    I am guessing, having never owned one before, that this is likely a problem with the midplane. Is there a way to troubleshoot the midplane? I very quick inspection, didn't reveal anything that was obvious. I plan on doing a more thorough inspection over the weekend.
    I am also making the assumption that I do not have to have a controller in the top slot for the bottom controller to work since the top controller works without having a controller in the bottom slot.
    Any help/insight would be appreciated

    LIttle Update in case it would help someone with more knowledge of this than I:
    When the Controller is in the lower position:
    or
    which I find interesting since I don't have an upper controller installed and the cooling modules both show as missing even though they exist (though 1 is failed).
    If I look at the other tabs:
    Info: Shows only Name: XServe RAID and Power State: On
    Arrays & Drives: Shows Not Installed for all drives on that side of the XServe RAID
    Fibre Channel is blank as I don't currently have it connected to my XServe
    Events shows nothing of significance to me other than all disks online
    When the controller is in the upper position however:
    I am curious as to why the RAID controller shows as present in both slots when it clearly is not however.
    Hoping it was just a cable from the midplane to the unit, I swapped cables this morning hoping for a failure, but did not get such failure, so I have ruled out the cable. The Controller seems to work when it is in the top slot, so I think that the controller is likely good as well. So I guess I can sum it up as:
    Power supplies: Good x2, shows a green light in either slot, swapped in testing
    Batteries: Good x2; Swapped in testing, Swapped in testing, works in upper slot, does not in lower slot
    Cooling Unit: Good x2; Swapped in testing, works in upper slot, does not in lower slot
    Controller: Good x1; works in upper slot, does not work in lower slot
    Which leads me back to the midplane as there isn't much else inside this unit that I can see that could go wrong. Does this sound like an accurate assessment? I ask because I want to be confident I have found the issue prior to ordering a new backplane.
    Once again, thanks in advance for any information.

  • Left side of XServe Raid disappeared.  Please help

    Hello,
    During the cleanup of a bunch of data on right side of my XServe Raid (two raid 5's with spare, one on the left side, one on the right side), the server became very unresponsive (Windows 2k server), to the point where it wouldn't even shut down. I reset the box but when it came back up the left side of the XServe was gone (showed up as a missing drive in disk manager).
    RAID Admin shows that there is no raid on the left side and shows all drives as spares. I've just completed copying all the data off of the still functional right hand side and can now attempt to recover the left side (if that's even possible?). I saw a suggestion that full power offs and restarts (multiple times) has helped another poster. So far I have powered down the XServe Raid 2 or 3 times without the left side raid showing up. I'll be trying a few more times shortly.
    I believe there is an option to recover the raid in RAID Admin? My XServe has an older version of firmware that does not support the RAID Admin Utilities. I have been nervous of upgrading the firmware and possibly irreversibly losing the raid if it isn't already irreversibly gone.
    Can anyone offer any suggestions?

    No luck on the reset, both via Raid Admin and the reset button on the XServe Raid.
    A restore of most of the data has completed onto another storage device.
    I can see a power spike or something wiping out the config of both arrays, but to have only one side just disappear and with no way to re-read the raid configuration from the drives, I can't trust the XServe RAID anymore and we won't be going back to using it.
    I certainly appreciate you taking the time to offer a suggestion Camelot!

  • Xserve RAID NO Power, need help please

    HI all,
    i have Xserve RAID, last night i shut down it normally, today i came to switch on, but its not responding, i can see only the Green LED on the power supply is blinking. NO POWER.
    please if you can help ASAP.
    thanks

    hi
    thanks for your reply,
    i have tried to do everything, i removed one of the power supplies at each time, but same. i pressed the power button on the back, but nothing happened.
    finally i opened the case of the XSR, i was surprised to find that the power cable between the power button on the back and the main board is disconnected, how i don't know, i never open it before, i vever move it, i don't know it was just disconnected.
    any way, its working now, thanks all

  • Newbie here...Need help for XServe RAID w/ XSAN in Vid Editing environment

    We're establishing an XSAN environment for video editing work flow. We're not new to SAN technology or video editing, but we are new to Xserve RAIDs, XSAN technology, and marrying them together in a production environment.
    We have an XServe RAID at 14x750GB configuration. 1 Xserve metadata server, 1 Xserve Quicktime server, and 4 editing stations (2 MacPro's, 2 G5's) that are in the fiber channel fabric. Each machine has dual channel 4GB cards.
    My PLEA for help concerns any advice this community can offer on RAID configuration, and XSAN configuration to achieve maximum performance. Settings, configurations, etc.
    XServe, XServe RAID, XSAN, MacPro, G5 Mac OS X (10.4.9)

    Were on the same boat but more like a life jacket
    We only need the Fibre for back-up.
    We have a single Avid Adrenaline on MacPro.
    One Xserve that basically acts as a server for fonts, audioclips, photocatalog and minor back-up via gigabit ethernet.
    Three G5s/MacPro/PC with 2/4GB FC installed.
    One 10.5 TB Xserve RAID.
    Last but not least a QLogic 1400 SAN box for Fibre.
    Nothing is installed yet as were waiting on our Apple rep for some answers with Xsan.
    Were not serving anything as far as external network and everything stays within the confines of our studio.
    My question is that are we missing anything other than maybe getting more ports on the SAN.
    We can live with a few workstations in the fabric.
    Thanks in advance
    XServe   Mac OS X (10.4.6)   OSX Server

  • Help setting up a Raid 0 on p55-gd80

    Hello  
    Picked up 2 WD 1tb black drives i wish to use in a Raid 0 configuration on my P55-GD80 mb.
    I have never set up a Raid before and would appreciate info on what Matrix/Rapid Storage drivers i will need, there are alot of them so im a bit confused here, also if these are not boot drives will i need to do the F6 bios configuration ive seen mention and such.
    If someone could take a moment to give me a Step by Step or a link to one.
    Thank you
    EDIT: i am running Windows 7 64

    Do you still have your board's manual with you? The guide is in the manual itself.
    If not, you can download a softcopy of the manual from MSI website.

  • Switching to Xserver/Xserve RAID

    Hi boys and girls...
    I was looking for a little assistance in switching over to Xserve. Let me give you some background info first.
    Were a small studio in London, with only 11 people in-house and the majority working externally whether free-lance, from home or from another country etc. Were mostly Mac based, though 4 machines are those little beige pc things all running XP 2002. At the minute its 1 G5 and a collection of G4 tower's and G4 power book's, G4 cube's and so on. Were all connected to a G4 server running Mac OS X Server 10.2.8 with a very small dual 120GB HD raid thing running Retrospect.
    Our problem is, this system was set up some time ago and were starting to outgrow it.
    What were looking for is a way to backup all of our current work and archive all of our old work. Most users like to work directly off the server as theres so much file sharing between the macs and pc's, directly updating files so there isnt any duplication etc.
    First question, is it possible (and a good/bad idea ?) to have 10-15 users working directly from a Mac server, that stores the archived work for users to reference and also current work which is backed up to tape and duplicated (as we currently have) to another HD?
    Secondly, Is the ideal way to be running things? Is there a more efficent way?
    Finally, what kind of spec should we be looking at? There's such a huge difference between servers, while were willing to invest, we dont want to go crazy (maybe a little) on costs.
    I look forward to your responses and thank you in advance
    Marcus

    There are certainly some drawbacks with your current setup that mean you should make some changes.
    In general, there's nothing wrong with working with files directly off the server, however, 10.2.8 has some issues with multiple users accessing the same files at the same time, so you should look to move to 10.4 ASAP to address that issue, regardless of any other changes you make.
    I am assuming that the remote users don't work this way - uploading/download files as appropriate - it would be painful to work off the server remotely.
    The only real disadvantage with working with files directly off the server is that if a file is changed erroneously and saved, there's no easy backup.
    If the file was copied to the local drive and saved, it's easy to roll back to the previous version by re-copying it from the server, but if that change is saved directly to the server the only rollback involves pulling out Retrospect.
    The other change that would make a difference is installing a gigabit switch and connecting the server to it. Even if all the host systems don't have gigabit ethernet, the extra bandwidth to the server will definitely help.
    As for a new server, 10-15 file sharing users are not likely to stress the server, do you don't need a top-of-the-line configuration.
    You should first decide how much disk space you need. With 500GB drives, the XServe can handle up to 1.5TB on its own, without any additional XServe RAID. However, you might want to consider RAID (using RAID you're limited to 1TB of RAID 5 storage, or 500GB of mirrored storage in the box).
    In addition to your current data usage, consider using an online disk backup where multiple copies of the data is stored on the server itself before (or in addition to) backing up to tape.
    While tapes offer several long-term archive advantages, they really don't work so well for quick restores of a file or two. Having a snapshot of the last couple of days data online makes it trivial to step back a day or so without having to resort to tapes. This may mean, though, that your 100GB of data requires 200 or 300GB of disk space.
    If you do decide than an XServe RAID is the right solution, consider getting it right-sized from the get-go rather than buying it small (e.g. 4 drives) and adding later. While it can be done, adding drives to an existing array is a PITA.
    If you do opt for an XServe RAID, and you don't currently have any rack-mounted equipment, consider using a PowerMac G5 as your server rather than an XServe. While similar in terms of performance, the PowerMac can work out cheaper depending on configuration.

  • Xserve RAID lost RAID 5 array on right/bottom controller

    I cleanly shut down an Xserve G5 with an Xserve RAID attached and then powered off the Xserve RAID this morning. I replaced a failing memory module in the Xserve and moved the rack 6". I then powered on the Xserve RAID, waited for a couple minutes until it was fully booted, and then booted the Xserve. When it came up, my RAID 50 volume failed to mount. Upon further investigation, it appears that the RAID 5 array on the right hand disks is "gone". In RAID Admin (Disks and Drives tab), the left side array is visible, but all disks on the right side list status as "OK" and Type: as "Spare".
    Configuration: Xserve RAID with 14 250 GB disks. Each side was configured with 6 disks in a RAID 5 array and one spare. These were striped using Software RAID on the Xserve into RAID 50 and mounted as a single volume. The RAID firmware is currently 1.5 and the Xserve is running OS X Server 10.4.3.
    To summarize today's activities: under Apple's guidance (as this entire system is covered under a Premium Support contract), I swapped the (bottom) controller for the right side, updated firmware (from v1.3/1.20a to 1.5/1.50), multiple resets of both controllers, repeated forced firmware updates, etc.
    Also, I swapped the left set of disks for the right set, and the array from the left set now shows up on the right side, and the missing array from the right is still missing with the disks on the left side. I replaced the disks to their original positions with the same results.
    RAID Admin's Utility "Recognize Array" will not perform any operations on the rigth side disks and Apple tells me that there's nothing further that I can do with it.
    None of this has solved the problem or substantially changed the issue, and the disks on the right side are still missing their associated array. Apple is unable/unwilling to offer any further help except to refer me to 3rd party data recovery services.
    Does anyone have any suggestion at all that might possibly recover the missing array? Is anyone aware of any tools that I might use to recreate the RAID 5 array on the right controller? I was hoping that there might exist some low-level tools with which the disks could be recreated into an array by hand? Are there any commercial products that would work on this? Any other ideas?
    Many thanks for any suggestions.
    - Martin
    Xserve RAID (14 250GB disks) on Xserve G5   Mac OS X (10.4.3)  

    Not sure why you swapped the controllers back and forth
    William, I don't think I was clear on this. I swapped the controller with a new controller that I had in a spare parts kit. This was at Apple's request.
    really, RAID is not a backup...
    I'm well aware, but despite my incessant warnings, users will become lulled in to a false sense of security when something "just works" for a very long time. This array wasn't intended to store valuable data that couldn't be lost, but...
    It may be possible for Apple to re-create the RAID set, did you ask AppleCare about the possibility?
    Apple has told me more than once that there's nothing else that they can do for me...and yet I keep calling back.
    I was surprised that this array was lost when there were absolutely no prior signs of a problem and the system was merely shutdown and restarted cleanly. I'm more surprised and quite disappointed to learn that Apple will do nothing else for me (under a Premium Support contract) to attempt to repair a damaged array. When I asked questions about where the RAID information is stored, I received the answers: "I can't tell you that" and "Apple doesn't release that information". I did not get the feeling that they were working with me, but rather holding my hand while they walked me through published documentation.
    I expected that there would be utilities (analagous to filesystem repair utilities) such as RAID Admin's "Recognize Array" that could help repair and recover damaged array data. I think that the lesson that I've leanred today is that I was naive to have expected such a thing without actually having investigated it ahead of time.
    Anyway, thanks for your input, William.

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