How to Restore a root (/) File System That Was on a Solstice DiskSuite Metadevice or Solaris Volume Manager Volume (Sun Cluster System Administration Guide for Solaris OS)

Sun Cluster System Administration Guide for Solaris OS

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How to Restore a root (`/`) File System That Was on a Solstice DiskSuite Metadevice or Solaris Volume Manager Volume

Use this procedure to restore a root (/) file system that was on a Solstice DiskSuite metadevice or Solaris Volume Manager volume when the backups were performed. Perform this procedure under circumstances such as when a root disk is corrupted and replaced with a new disk. The node being restored should not be booted. Be sure the cluster is running problem-free before performing the restore procedure.

Note –

Since you must partition the new disk using the same format as the failed disk, identify the partitioning scheme before you begin this procedure, and recreate file systems as appropriate.

Steps

Become superuser or assume an equivalent role on a cluster node with access to the diskset, other than the node you want to restore.

Remove from all disksets the hostname of the node being restored.
# metaset -s setname -f -d -h nodelist
-s setname

Specifies the metaset name.

-f

Force.

-d

Deletes from the metaset.

-h nodelist

Specifies the name of the node to delete from the metaset.

Replace the failed disk on the node on which the root (/) file system will be restored.

Refer to disk replacement procedures in the documentation that came with your server.

Boot the node that you want to restore.

If you are using the Solaris CD:

SPARC: At the OpenBoot PROM ok prompt, type the following command:
ok boot cdrom -s

x86: Insert the CD into the system's CD drive and boot the system by shutting it down and then turning it off and on. On the Current Boot Parameters screen, type the following command:

                     <<< Current Boot Parameters >>>
Boot path: /pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci8086,341a@
7,1/sd@0,0:a
Boot args:

Type b [file-name] [boot-flags] <ENTER> to boot with options
or   i <ENTER>                          to enter boot interpreter
or   <ENTER>                            to boot with defaults

                 <<< timeout in 5 seconds >>>
Select (b)oot or (i)nterpreter: b -s

If you are using a Solaris JumpStart^TM server:

SPARC: At the OpenBoot PROM ok prompt, type the following command:
ok boot net -s

x86: Boot the system by shutting it down and then turning it off and on. On the Current Boot Parameters screen, type the following command:

                     <<< Current Boot Parameters >>>
Boot path: /pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci8086,341a@
7,1/sd@0,0:a
Boot args:

Type b [file-name] [boot-flags] <ENTER> to boot with options
or   i <ENTER>                          to enter boot interpreter
or   <ENTER>                            to boot with defaults

                 <<< timeout in 5 seconds >>>
Select (b)oot or (i)nterpreter: b -s

Create all the partitions and swap on the root disk using the format command.

Recreate the original partitioning scheme that was on the failed disk.

Create the root (/) file system and other file systems as appropriate, using the newfs command

Recreate the original file systems that were on the failed disk.

Note –
Be sure to create the /global/.devices/node@nodeid file system.

Mount the root (/) file system on a temporary mount point.
# mount device temp-mountpoint

Use the following commands to restore the root (/) file system.

# cd temp-mountpoint
# ufsrestore rvf dump-device
# rm restoresymtable

Install a new boot block on the new disk.

# /usr/sbin/installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk 
raw-disk-device

Remove the lines in the /temp-mountpoint/etc/system file for MDD root information.

* Begin MDD root info (do not edit)
forceload: misc/md_trans
forceload: misc/md_raid
forceload: misc/md_mirror
forceload: misc/md_hotspares
forceload: misc/md_stripe
forceload: drv/pcipsy
forceload: drv/glm
forceload: drv/sd
rootdev:/pseudo/md@0:0,10,blk
* End MDD root info (do not edit)

Edit the /temp-mountpoint/etc/vfstab file to change the root entry from a Solstice DiskSuite metadevice or a Solaris Volume Manager volume to a corresponding normal slice for each file system on the root disk that is part of the metadevice or volume.
Example: Change from— /dev/md/dsk/d10 /dev/md/rdsk/d10 / ufs 1 no - Change to— /dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0 / ufs 1 no -

Unmount the temporary file system, and check the raw disk device.
# cd / # umount temp-mountpoint # fsck raw-disk-device

Reboot the node in multiuser mode.
# reboot

Replace the disk ID using the scdidadm command.
# scdidadm -R rootdisk

Use the metadb command to recreate the state database replicas.
# metadb -c copies -af raw-disk-device
-c copies

Specifies the number of replicas to create.

-af raw-disk-device

Creates initial state database replicas on the named raw disk device.

From a cluster node other than the restored node, use the metaset command to add the restored node to all disksets.
phys-schost-2# metaset -s setname -a -h nodelist
-a

Adds (creates) the metaset.

Set up the metadevice or volume/mirror for root ( /) according to the Solstice DiskSuite documentation.

The node is rebooted into cluster mode. The cluster is ready to use.

Example 9–7 Restoring a root (`/`) File System That Was on a Solstice DiskSuite Metadevice or Solaris Volume Manager Volume

The following example shows the root (/) file system restored to the node phys-schost-1 from the tape device /dev/rmt/0. The metaset command is run from another node in the cluster, phys-schost-2, to remove and later add back node phys-schost-1 to the metaset schost-1. All other commands are run from phys-schost-1 . A new boot block is created on /dev/rdsk/c0t0d0s0, and three state database replicas are recreated on /dev/rdsk/c0t0d0s4 .

[Become superuser or assume an equivalent role on a cluster node with access to the metaset, 
other than the node to be restored.]
[Remove the node from the metaset:]
phys-schost-2# metaset -s schost-1 -f -d -h phys-schost-1
[Replace the failed disk and boot the node:]

Boot the node from the Solaris CD:

SPARC: At the OpenBoot PROM ok prompt, type the following command:
ok boot cdrom -s

x86: Insert the CD into the system's CD drive and boot the system by shutting it down and then turning it off and on. On the Current Boot Parameters screen, type the following command:

                      <<< Current Boot Parameters >>>
Boot path: /pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci8086,341a@7,1/
sd@0,0:a
Boot args:

Type  b [file-name] [boot-flags] <ENTER> to boot with options
or    i <ENTER>                          to enter boot interpreter
or    <ENTER>                            to boot with defaults

                  <<< timeout in 5 seconds >>>
Select (b)oot or (i)nterpreter: b -s

[Use format
 and newfs to recreate partitions and file systems
.]
[Mount the root file system on a temporary mount point:]
# mount /dev/dsk/c0t0d0s0 /a
[Restore the root file system:]
# cd /a
# ufsrestore rvf /dev/rmt/0
# rm restoresymtable
[Install a new boot block:]
# /usr/sbin/installboot /usr/platform/`uname \
-i`/lib/fs/ufs/bootblk /dev/rdsk/c0t0d0s0

[Remove the lines in /
temp-mountpoint/etc/system file for MDD root information:
]
* Begin MDD root info (do not edit)
forceload: misc/md_trans
forceload: misc/md_raid
forceload: misc/md_mirror
forceload: misc/md_hotspares
forceload: misc/md_stripe
forceload: drv/pcipsy
forceload: drv/glm
forceload: drv/sd
rootdev:/pseudo/md@0:0,10,blk
* End MDD root info (do not edit)
[Edit the /temp-mountpoint/etc/vfstab
file]
Example: 
Change from—
/dev/md/dsk/d10   /dev/md/rdsk/d10    /      ufs   1     no       -

Change to—
/dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0  /usr   ufs   1     no       -
[Unmount the temporary file system and check the raw disk device:
]
# cd /
# umount /a
# fsck /dev/rdsk/c0t0d0s0
[Reboot:]
# reboot
[Replace the disk ID:]
# scdidadm -R /dev/rdsk/c0t0d0
[Recreate state database replicas:]
# metadb -c 3 -af /dev/rdsk/c0t0d0s4
[Add the node back to the metaset:]
phys-schost-2# metaset -s schost-1 -a -h phys-schost-1