When a drive that is under control of volume manager configured in a volume
recieves a disk error, it can place the disk into a failed state even when
the error is not fatal. Use vxdisk list to check the status of the drive
In these cases the command produces output like the following:

DEVICE       TYPE      DISK         GROUP        STATUS
c0t0d0s2     sliced    -            -            error
c0t1d0s2     sliced    -            -            error
c0t2d0s2     sliced    -            -            error
c0t3d0s2     sliced    -            -            error
c1t0d0s2     sliced    rootdisk     rootdg       online
c1t1d0s2     sliced    -            -            error
c2t0d0s2     sliced    -            -            error
c3t0d0s2     sliced    ckdg01       ckdg         online
c3t0d1s2     sliced    disk08       rootdg       online
c3t0d2s2     sliced    ckdg06       ckdg         online
c3t0d3s2     sliced    paul03       paul         online
c3t0d4s2     sliced    paul05       paul         online
c3t1d0s2     sliced    ckdg04       ckdg         online
c3t1d1s2     sliced    dale01       dale1        online
c3t1d2s2     sliced    dale02       dale1        online
c3t1d3s2     sliced    dale03       dale1        online
c3t1d4s2     sliced    -            -            online
c3t2d0s2     sliced    ckdg02       ckdg         online
c3t2d1s2     sliced    dale05       dale1        online
c3t2d2s2     sliced    dale06       dale1        online
c3t2d3s2     sliced    disk02       rootdg       online
c3t2d4s2     sliced    disk03       rootdg       online
c3t3d0s2     sliced    ckdg05       ckdg         online
c3t3d1s2     sliced    -            -            online
c3t3d2s2     sliced    disk07       rootdg       online
c3t3d3s2     sliced    paul02       paul         online
c3t4d0s2     sliced    -            -            online
c3t4d1s2     sliced    ckdg03       ckdg         online
c3t4d2s2     sliced    dale04       dale1        online
c3t4d3s2     sliced    dale09       dale1        online
c3t4d4s2     sliced    -            -            online
c3t5d0s2     sliced    dale11       dale1        online
c3t5d1s2     sliced    -            -            online
c3t5d2s2     sliced    -            -            online
-            -         paul01       paul         failed was:c3t3d1s2

In most cases you can reattach the drive to itself by using:

#vxdg -g paul -k adddisk paul01=c3t3d1s2

This does not always work, In these cases you mark the drive as bad
and then replace it with itself. When replacing drives with itself, 
it is only recommended to do this on drives that recieved non-fatal errors.

We will use vxdiskadm to replace the drive with itself.

# vxdiskadm


Volume Manager Support Operations
Menu: VolumeManager/Disk

 1	Add or initialize one or more disks
 2	Encapsulate one or more disks
 3	Remove a disk
 4	Remove a disk for replacement
 5	Replace a failed or removed disk
 6	Mirror volumes on a disk
 7	Move volumes from a disk
 8	Enable access to (import) a disk group
 9	Remove access to (deport) a disk group
 10	Enable (online) a disk device
 11	Disable (offline) a disk device
 12	Mark a disk as a hot-spare for a disk group
 13	Turn off the hot-spare flag on a disk
 list	List disk information

 ?	Display help about menu
 ??	Display help about the menuing system
 q	Exit from menus

Select an operation to perform: 4



Remove a disk for replacement
Menu: VolumeManager/Disk/RemoveForReplace

  Use this menu operation to remove a physical disk from a disk
  group, while retaining the disk name.  This changes the state
  for the disk name to a "removed" disk.  If there are any
  initialized disks that are not part of a disk group, you will be
  given the option of using one of these disks as a replacement.

Enter disk name [<disk>,list,q,?] paul01

  The following volumes will lose mirrors as a result of this
  operation:

  	vol01

  No data on these volumes will be lost.
vxvm:vxdisk: ERROR: Device c3t3d1s2: get_contents failed:
	Disk device is offline

  The following devices are available as replacements:

  	c3t1d4 c3t4d0 c3t4d4 c3t5d1 c3t5d2

  You can choose one of these disks now to replace paul01.
  Select "none" if you do not wish to select a replacement disk.

Choose a device, or select "none"
[<device>,none,q,?] (default: c3t1d4) none

  The requested operation is to remove disk paul01 from disk group
  paul.  The disk name will be kept, along with any volumes using
  the disk, allowing replacement of the disk.

  Select "Replace a failed or removed disk" from the main menu
  when you wish to replace the disk.

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

  Removal of disk paul01 completed successfully.

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


Volume Manager Support Operations
Menu: VolumeManager/Disk

 1	Add or initialize one or more disks
 2	Encapsulate one or more disks
 3	Remove a disk
 4	Remove a disk for replacement
 5	Replace a failed or removed disk
 6	Mirror volumes on a disk
 7	Move volumes from a disk
 8	Enable access to (import) a disk group
 9	Remove access to (deport) a disk group
 10	Enable (online) a disk device
 11	Disable (offline) a disk device
 12	Mark a disk as a hot-spare for a disk group
 13	Turn off the hot-spare flag on a disk
 list	List disk information

 ?	Display help about menu
 ??	Display help about the menuing system
 q	Exit from menus

Select an operation to perform: 5



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,?] paul01

  The following devices are available as replacements:

  	c3t1d4s2 c3t4d0s2 c3t4d4s2 c3t5d1s2 c3t5d2s2

  You can choose one of these disks to replace paul01.
  Choose "none" to initialize another disk to replace paul01.

Choose a device, or select "none"
[<device>,none,q,?] (default: c3t1d4s2) none

Select disk device to initialize [<address>,list,q,?] c3t3d1

  The following disk device has a valid VTOC, but does not appear to have
  been initialized for the Volume Manager.  If there is data on the disk
  that do not want to be destroyed, you encapsulate the existing disk
  partitions as volumes instead of adding the disk as a new disk.
  Output format: [Device_Name]

  c3t3d1

Encapsulate this device? [y,n,q,?] (default: y) n

  c3t3d1

Instead of encapsulating, initialize? [y,n,q,?] (default: n) y

  The requested operation is to initialize disk device c3t3d1 and
  to then use that device to replace the removed or failed disk
  paul01 in disk group paul.

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

  Replacement of disk paul01 in group paul with disk device
  c3t3d1 completed successfully.

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


Volume Manager Support Operations
Menu: VolumeManager/Disk

 1	Add or initialize one or more disks
 2	Encapsulate one or more disks
 3	Remove a disk
 4	Remove a disk for replacement
 5	Replace a failed or removed disk
 6	Mirror volumes on a disk
 7	Move volumes from a disk
 8	Enable access to (import) a disk group
 9	Remove access to (deport) a disk group
 10	Enable (online) a disk device
 11	Disable (offline) a disk device
 12	Mark a disk as a hot-spare for a disk group
 13	Turn off the hot-spare flag on a disk
 list	List disk information

 ?	Display help about menu
 ??	Display help about the menuing system
 q	Exit from menus

Select an operation to perform: q

Goodbye.
# 

At this point the affected plex should start the resync.