ADAPTEC 2020SA Raid5 missing

Posted on 2006-04-19
Last Modified: 2012-06-27
Hi Experts,

Adaptec 2020SA sata raid controller doesn't see his RAID5 anymore. At boot the controllor says:

Configuration change has been detected in the system, if you reject the config change, you'll not be able to modify current configuration. If you accept, it will be updated to the current configuration.

If I accept the RAID5 is gone, but I can still see the disks. And they are in OPTIMAL state. If I reject he knows of the RAID5, but can't do anything.

If I boot with an extra disk to windows and install the ASM, it too sees that those disks are 'linked' and even sees the hotspare but he does't recognize it as a RAID5 anymore. If I select them and ask for status it says: Logical Device: Failed. (and still all disks are in OPTIMAL condition)...

Any advice how to get the raid back online?

Question by:dannydockx
    LVL 5

    Expert Comment

    Okey, looks like one of the drives has failed anyway.

    You can attempt to repair the raid set with ctrl+r when you dont accept the change and go into the controller bios.

    Sometimes it works, sometimes not. I had same issue with Adaptec 2410

    I would like to issue a warning when using lots of SATA drives in a RAID 5 set. Some brands are sensitive to timeout in the SATA bus which results in a failed set. The usual quickfix for it is to have a hot spare and when a drive fails, diagnose it to see if it's in fact a working drive.


    Author Comment

    ctrl-r doesn't do anything... If I don't accept the changes it show the 3 drives, and below says read only mode. No other options available.

    Did software recovery, but dunno if much is useable. So now I'm restoring from backup, no more Raid5. (2x 2 mirrored disks now)

    If someone still has advice, pls post, still have the disks lying around to do some more testing if I have time.

    LVL 5

    Accepted Solution

    Another tip,

    Disable any write cashing on the controller if you don't have the battery backup module for the controller. It might trash your filesystem if the power fails. It happened to me. I can't recall if 2020 has on board cache module but if it has, use it all for read cache instead.

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