Tag: Volume Manager

A short guide on how to recover a broken DiskSuite mirror.

1. Check metastat information:

   # metastat -c
   d30              m   34GB d31 (maint) d32
    d31          s   34GB c0t0d0s3 (maint)
   d32          s   34GB c0t1d0s3
   d20              m  4.0GB d21 (maint) d22
   d21          s  4.0GB c0t0d0s1 (maint)
   d22          s  4.0GB c0t1d0s1
   d10              m   30GB d11 (maint) d12
   d11          s   30GB c0t0d0s0 (maint)
   d12          s   30GB c0t1d0s0
   hsp001           h      -
   
   

2. Remove the broken replicas from the metadb :

   # metadb -i
           flags           first blk       block count
         W   p  l          16              8192            /dev/dsk/c0t0d0s7
         W   p  l          8208            8192            /dev/dsk/c0t0d0s7
        a m  p  luo        16              8192            /dev/dsk/c0t1d0s7
        a    p  luo        8208            8192            /dev/dsk/c0t1d0s7
   . . .
   
   # metadb -d /dev/dsk/c0t0d0s7

3. Replace the broken disk
4. Check that the new disk is visible:

   # format
   Searching for disks...done
   
   AVAILABLE DISK SELECTIONS:
    0. c0t0d0
   /pci@1c,600000/scsi@2/sd@0,0
   1. c0t1d0
   /pci@1c,600000/scsi@2/sd@1,0
   

5. Copy the partition table from the healthy to the new disk:

   # prtvtoc /dev/rdsk/c0t1d0s0 | fmthard -s - \
   /dev/rdsk/c0t0d0s0
   fmthard:  New volume table of contents now in place.

6. Create metadb replicas (for example, 2 copies in slice 7):

   # metadb -a -c2 /dev/rdsk/c0t0d0s7

7. Verifying the metadb:

   # metadb -i
    flags           first blk       block count
   a        u         16              8192            /dev/dsk/c0t0d0s7
   a        u         8208            8192            /dev/dsk/c0t0d0s7
   a    p  luo        16              8192            /dev/dsk/c0t1d0s7
   a    p  luo        8208            8192            /dev/dsk/c0t1d0s7
   
   

8. “Metareplace” the failed slices:

   # metastat | fgrep replace
   Invoke: metareplace d30 c0t0d0s3
   Invoke: metareplace d20 c0t0d0s1
   Invoke: metareplace d10 c0t0d0s0
   
   # metareplace -e d30 c0t0d0s3
   d30: device c0t0d0s3 is enabled
   # metareplace -e d20 c0t0d0s1
   d20: device c0t0d0s1 is enabled
   # metareplace -e d10 c0t0d0s0
   d10: device c0t0d0s0 is enabled
   

9. Periodically check the resyncing status:

   # metastat | fgrep esync
   State: Resyncing
   Resync in progress: 0 % done
   State: Resyncing
   c0t0d0s3          0     No       Resyncing   Yes
   State: Resyncing
   Resync in progress: 19 % done
   State: Resyncing
   c0t0d0s1          0     No       Resyncing   Yes
   State: Resyncing
   Resync in progress: 2 % done
   State: Resyncing
   c0t0d0s0          0     No       Resyncing   Yes