NSS4000 + RAID5 + LVM2 failure.

Unanswered Question
Feb 25th, 2010
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Hi Guys


I work in a data recovery company. We have Linksys NSS4000 and we can't access to files.


Client told us, that It's a raid5 created from 4x500 HDD. Disks are joined with LVM2 and formatted with XFS file system.


HDD's (3th and 4th) had many bad sectors and died day by day as wee saw in logs


We clone disks and ran nss with our disks.


status.png


I selected "raid" and i started that raid


raid.png


and....


raid failed.png


So i created clones once again (from dd's RAW files). Switching to Debian and mdadm


I assemble raid array with "force" option


mdadm --detail /dev/md/0 looks like:


/dev/md/0:
        Version : 01.02
  Creation Time : Fri Aug 15 14:56:56 2008
     Raid Level : raid5
     Array Size : 1465159296 (1397.28 GiB 1500.32 GB)
  Used Dev Size : 976772864 (931.52 GiB 1000.22 GB)
   Raid Devices : 4
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent


    Update Time : Thu Feb 25 14:18:57 2010
          State : clean, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
  Spare Devices : 0


         Layout : left-symmetric
     Chunk Size : 32K


           Name : 'debian':0
           UUID : 7de32897:8ff2b4ca:7f4a3d2f:d26cbaa7
         Events : 84


    Number   Major   Minor   RaidDevice State
       0       8        0        0      active sync   /dev/sda
       1       8       16        1      active sync   /dev/sdb
       2       0        0        2      removed
       3       8       48        3      active sync   /dev/sdd


fdisk -l /dev/sd*


Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x5a737d40


   Device Boot      Start         End      Blocks   Id  System


Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xc42b2038


   Device Boot      Start         End      Blocks   Id  System


Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xc048b626


   Device Boot      Start         End      Blocks   Id  System


Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x5a737d41


   Device Boot      Start         End      Blocks   Id  System


There is no file system. and no data connected with lvm! I checked lvscan, vgscan etc and nothing...


How to recovery data? There is no any backup, so please don't propose that ;-)


I will very appreciated if you'll give me some new clues, another leads. I can't sleep already, I waking up every night and move my fingers to "m d a d m" key combination....


Best Regards

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steve.monkhouse... Fri, 05/14/2010 - 14:58
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Did you find a solution to this ?


I have the exact same problem with an NSS6000 with 4 x 750Gb Drives in a single RAID5 array..


the array is saying 'stopped' and pressing start yeilds the exact same message you are getting..


any help would be great..


Cheers

Steve

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