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VxVM tutorials : Replacing a failed disk under VxVM

by admin

VxVM Tutorials
  • Installing VxvM in VMware virtual machine
  • Creating Basic volume and file system
  • Volume layouts and layered volumes
  • Comparing layered and non-layered Volumes
  • Root disk Encapsulation and Mirroring
  • Volume resize with vxassist and vxresize

Disks fail at some point in time. Thus the volume managers are built to handle these failures. Now in case of VxVM if a disk in a disk groups fails we can replace it online if its mirrored. The procedure to replace a failed disk under VxVM is quite simple.

Now, I have a failed disk under Disk group “mydg”. The volume “myvol” is mirrored so the data would remain intact after failure. The vxprint output of mydg is as follows, which shows that one of the plex is in DISABLED, NODEVICE state

# vxprint -htg mydg
..........

dg mydg         default      default  5000     1382967597.23.geeklab

dm disk01       c1t2d0s2     auto     65536    2027168  -
dm disk02       -            -        -        -        NODEVICE

v  myvol        -            ENABLED  ACTIVE   204800   SELECT    -        fsgen
pl myvol-01     myvol        ENABLED  ACTIVE   204800   CONCAT    -        RW
sd disk01-01    myvol-01     disk01   0        204800   0         c1t2d0   ENA
pl myvol-02     myvol        DISABLED NODEVICE 204800   CONCAT    -        WO
sd disk02-01    myvol-02     disk02   0        204800   0         -        NDEV

Also if you see the vxdisk command output you would see the failed disk:

# vxdisk -eoalldgs list
DEVICE       TYPE           DISK        GROUP        STATUS               OS_NATIVE_NAME   ATTR
c1t0d0s2     auto:sliced    rootdisk     rootdg      online               c1t0d0s2         -
c1t1d0s2     auto:sliced    rootmirror   rootdg      online               c1t1d0s2         -
c1t2d0s2     auto:cdsdisk   disk01       mydg        online               c1t2d0s2         -
c1t4d0s2     auto:cdsdisk   -            -           online               c1t4d0s2         -
c1t5d0s2     auto:cdsdisk   -            -           online               c1t5d0s2         -
c1t6d0s2     auto:cdsdisk   -            -           online               c1t6d0s2         -
c1t8d0s2     auto:cdsdisk   -            -           online               c1t8d0s2         -
-            -         disk02       mydg         failed was:c1t3d0s2

Now we can replace the failed disk directly with the help of vxdiskadm command. Choose option 5 to replace a failed disk

# vxdiskadm

Volume Manager Support Operations
Menu: VolumeManager/Disk

 ........ (other options removed for brevity)

 5      Replace a failed or removed disk

 .........

Select an operation to perform: 5

List the failed disks under VxVM using “list” option, and select the failed disk disk02 from disk group mydg. We would have to choose an alternate disk for the replacement of the failed disk. The new disk (c1t4d0) will automatically be named disk02 under VxVM.

Replace a failed or removed disk
Menu: VolumeManager/Disk/ReplaceDisk
  Use this menu operation to specify a replacement disk for a disk
  that you removed with the "Remove a disk for replacement" menu
  operation, or that failed during use.  You will be prompted for
  a disk name to replace and a disk device to use as a replacement.
  You can choose an uninitialized disk, in which case the disk will
  be initialized, or you can choose a disk that you have already
  initialized using the Add or initialize a disk menu operation.

Select a removed or failed disk [[disk], list,q,?] list

Disk group: rootdg

DM NAME         DEVICE       TYPE     PRIVLEN  PUBLEN   STATE


Disk group: mydg

DM NAME         DEVICE       TYPE     PRIVLEN  PUBLEN   STATE

dm disk02       -            -        -        -        NODEVICE


Select a removed or failed disk [[disk],list,q,?] disk02
  The following devices are available as replacements:

        c1t4d0 c1t5d0 c1t6d0 c1t8d0

  You can choose one of these devices to replace disk02.
  Choose "none" to abort the replacement of disk02.

Choose a device, or select none
[[device],none,q,?]  (default: c1t4d0)
  VxVM  INFO V-5-2-382
The requested operation is to use the initialized device c1t4d0
  to replace the removed or failed disk disk02 in disk group mydg.

Continue with operation? [y,n,q,?]  (default: y)

Now we can use FMR (Fast Mirror Resynchronization) to perform a quick and efficient resynchronization of stale mirrors.

Use FMR for plex resync? [y,n,q,?]  (default: n) y
  VxVM  INFO V-5-2-282
Replacement of disk disk02 in group mydg with disk device
  c1t4d0 completed successfully.

Replace another disk? [y,n,q,?]  (default: n) n

I hope the post was informative. Stay tuned and subscribe for more interesting posts on VxVM and Solaris.

How to replace a disk under ZFS in Solaris
How to replace failed root disk under Solaris Volume Manager (SVM)

Filed Under: VxVM Tagged With: solaris, VxVM

Some more articles you might also be interested in …

  1. VxVM tutorials : Volume resize with vxassist and vxresize
  2. VxVM tutorials : Root disk Encapsulation and Mirroring
  3. VxVM tutorials : Comparing layered and non-layered volumes
  4. VxVM tutorials : Volume layouts and layered volumes
  5. VxVM Tutorials : Creating Volume and file system

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