Recovering Configuration From a Different System

You can recover a Solaris Volume Manager configuration, even onto a different system from the original. For example, assume you have a system with an external Multipack of six disks in it, and a Solaris Volume Manager configuration, including at least one state database replica, on some of those disks. If you experience a system failure, you can attach the Multipack to a different system and recover the complete configuration from the local disk set.

Only recover a Solaris Volume Manager configuration onto a system with no preexisting Solaris Volume Manager configuration. Otherwise, you risk replacing a logical volume on your system with a logical volume that you are recovering, and possibly corrupting your system.

This process only works to recover volumes from the local disk set.

How to Recover a Configuration

How to Recover a Configuration

1. Attach the disk or disks that contain the Solaris Volume Manager configuration to a system with no preexisting Solaris Volume Manager configuration.

2. Do a reconfiguration reboot to ensure that the system recognizes the newly added disks.

   # reboot -- -r

3. Determine the major/minor number for a slice containing a state database replica on the newly added disks.

   Use ls -lL, and note the two numbers between the group name and the date. Those are the major/minor numbers for this slice.

   # ls -Ll /dev/dsk/c1t9d0s7 brw-r----- 1 root sys 32, 71 Dec 5 10:05 /dev/dsk/c1t9d0s7

4. If necessary, determine the major name corresponding with the major number by looking up the major number in /etc/name_to_major.

   # grep " 32" /etc/name_to_major sd 32

5. Update the /kernel/drv/md.conf file with two commands: one command to tell Solaris Volume Manager where to find a valid state database replica on the new disks, and one command to tell it to trust the new replica and ignore any conflicting device ID information on the system.

   In the line in this example that begins with mddb_bootlist1, replace the sd in the example with the major name you found in the previous step. Replace 71 in the example with the minor number you identified in Step 3.

   #pragma ident "@(#)md.conf 2.1 00/07/07 SMI" # # Copyright (c) 1992-1999 by Sun Microsystems, Inc. # All rights reserved. # name="md" parent="pseudo" nmd=128 md_nsets=4; # #pragma ident "@(#)md.conf 2.1 00/07/07 SMI" # # Copyright (c) 1992-1999 by Sun Microsystems, Inc. # All rights reserved. # name="md" parent="pseudo" nmd=128 md_nsets=4; # Begin MDD database info (do not edit) mddb_bootlist1="sd:71:16:id0"; md_devid_destroy=1;# End MDD database info (do not edit)

6. Reboot to force Solaris Volume Manager to reload your configuration.

   You will see messages similar to the following displayed to the console.

   volume management starting. Dec 5 10:11:53 lexicon metadevadm: Disk movement detected Dec 5 10:11:53 lexicon metadevadm: Updating device names in Solaris Volume Manager The system is ready.

7. Verify your configuration by using the metadb and metastat commands.

   # metadb flags first blk block count a m p luo 16 8192 /dev/dsk/c1t9d0s7 a luo 16 8192 /dev/dsk/c1t10d0s7 a luo 16 8192 /dev/dsk/c1t11d0s7 a luo 16 8192 /dev/dsk/c1t12d0s7 a luo 16 8192 /dev/dsk/c1t13d0s7 # metastat d12: RAID State: Okay Interlace: 32 blocks Size: 125685 blocks Original device: Size: 128576 blocks Device Start Block Dbase State Reloc Hot Spare c1t11d0s3 330 No Okay Yes c1t12d0s3 330 No Okay Yes c1t13d0s3 330 No Okay Yes d20: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 3592 8192 d21: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 11785 8192 d22: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 19978 8192 d10: Mirror Submirror 0: d0 State: Okay Submirror 1: d1 State: Okay Pass: 1 Read option: roundrobin (default) Write option: parallel (default) Size: 82593 blocks d0: Submirror of d10 State: Okay Size: 118503 blocks Stripe 0: (interlace: 32 blocks) Device Start Block Dbase State Reloc Hot Spare c1t9d0s0 0 No Okay Yes c1t10d0s0 3591 No Okay Yes d1: Submirror of d10 State: Okay Size: 82593 blocks Stripe 0: (interlace: 32 blocks) Device Start Block Dbase State Reloc Hot Spare c1t9d0s1 0 No Okay Yes c1t10d0s1 0 No Okay Yes Device Relocation Information: Device Reloc Device ID c1t9d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3487980000U00907AZ c1t10d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3397070000W0090A8Q c1t11d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3449660000U00904NZ c1t12d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS32655400007010H04J c1t13d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3461190000701001T0 # # metadb flags first blk block count a m p luo 16 8192 /dev/dsk/c1t9d0s7 a luo 16 8192 /dev/dsk/c1t10d0s7 a luo 16 8192 /dev/dsk/c1t11d0s7 a luo 16 8192 /dev/dsk/c1t12d0s7 a luo 16 8192 /dev/dsk/c1t13d0s7 # metastat d12: RAID State: Okay Interlace: 32 blocks Size: 125685 blocks Original device: Size: 128576 blocks Device Start Block Dbase State Reloc Hot Spare c1t11d0s3 330 No Okay Yes c1t12d0s3 330 No Okay Yes c1t13d0s3 330 No Okay Yes d20: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 3592 8192 d21: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 11785 8192 d22: Soft Partition Device: d10 State: Okay Size: 8192 blocks Extent Start Block Block count 0 19978 8192 d10: Mirror Submirror 0: d0 State: Okay Submirror 1: d1 State: Okay Pass: 1 Read option: roundrobin (default) Write option: parallel (default) Size: 82593 blocks d0: Submirror of d10 State: Okay Size: 118503 blocks Stripe 0: (interlace: 32 blocks) Device Start Block Dbase State Reloc Hot Spare c1t9d0s0 0 No Okay Yes c1t10d0s0 3591 No Okay Yes d1: Submirror of d10 State: Okay Size: 82593 blocks Stripe 0: (interlace: 32 blocks) Device Start Block Dbase State Reloc Hot Spare c1t9d0s1 0 No Okay Yes c1t10d0s1 0 No Okay Yes Device Relocation Information: Device Reloc Device ID c1t9d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3487980000U00907AZ1 c1t10d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3397070000W0090A8Q c1t11d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3449660000U00904NZ c1t12d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS32655400007010H04J c1t13d0 Yes id1,sd@SSEAGATE_ST39103LCSUN9.0GLS3461190000701001T0 # metastat -p d12 -r c1t11d0s3 c1t12d0s3 c1t13d0s3 -k -i 32b d20 -p d10 -o 3592 -b 8192 d21 -p d10 -o 11785 -b 8192 d22 -p d10 -o 19978 -b 8192 d10 -m d0 d1 1 d0 1 2 c1t9d0s0 c1t10d0s0 -i 32b d1 1 2 c1t9d0s1 c1t10d0s1 -i 32b #