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List:       evms-devel
Subject:    [Evms-devel] How to Activate Dirty Degraded RAID5 ?
From:       "m9230" <m9230 () cn ! ee ! ccu ! edu ! tw>
Date:       2006-08-28 8:22:56
Message-ID: 20060828080032.M65504 () cn ! ee ! ccu ! edu ! tw
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Hi 

I have some questions about the degraded RAID5.
Any help is appreciated, thanks.

Setup: FC5 kernel 2.6.15, EVMS V 2.5.5

1. Create RAID5 by sda, sdb, sdc, sdd:
  create: Region, MDRaid5RegMgr={}, sda, sdb, sdc, sdd
  create: Volume, md/md0, Name=volume1
  mkfs: XFS={}, /dev/evms/volume1
  Mount: /dev/evms/volume1, /mnt

2. Shutdown and remove index 3 disk
(The Resyncing Process is not finished yet)

3. Run evms_activate, it says cannot start dirty degraded array:
MDRaid5RegMgr: RAID5 array md/md0 is missing the member  with RAID index 3.  
The array is running in degrade mode.
MDRaid5RegMgr: Region md/md0 is currently in degraded mode.  To bring it 
back to normal state, add 1 new spare device to replace the faulty or 
missing device
.
md: md0: raid array is not clean -- starting background reconstruction
raid5: device sda operational as raid disk 2
raid5: device sdb operational as raid disk 1
raid5: device sdc operational as raid disk 0
raid5: cannot start dirty degraded array for md0
RAID5 conf printout:
 --- rd:4 wd:3 fd:1
 disk 0, o:1, dev:sdc
 disk 1, o:1, dev:sdb
 disk 2, o:1, dev:sda
raid5: failed to run raid set md0
md: pers->run() failed ...
md: array md0 already has disks!
md: array md0 already has disks!
md: array md0 already has disks!


4. Is this normal (Remove disk while Resyncing not completed)?
If this is normal, is there anyway to activate Dirty Degraded RAID5 ?

5. I tried to activate this RAID5 but failed:
#mdadm -S /dev/md0
#mdadm -Af /dev/md0 /dev/sda /dev/sdb /dev/sdc
mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
# cat /proc/mdstat
Personalities : [raid5] [raid4]
md0 : inactive sdc[0] sda[2] sdb[1]
      898643328 blocks

unused devices: <none>

#mdadm -D /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Mon Aug 28 17:08:01 2006
     Raid Level : raid5
    Device Size : 78150656 (74.53 GiB 80.03 GB)
   Raid Devices : 4
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon Aug 28 17:11:16 2006
          State : active, degraded
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-asymmetric
     Chunk Size : 32K

           UUID : 4fef7e3e:4786c391:4a87195a:57904cb5
         Events : 0.4

    Number   Major   Minor   RaidDevice State
       0       8       32        0      active sync   /dev/sdc
       1       8       16        1      active sync   /dev/sdb
       2       8        0        2      active sync   /dev/sda
       0       0        0        0      removed


--
Best Regards

Michael Yao




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