Clearing the failing flag on a disk


Clearing the failing flag on a disk
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If I/O errors are intermittent rather than persistent, Veritas Volume Manager sets the failing flag on a disk, rather than detaching the disk. Such errors can occur due to the temporary removal of a cable, controller faults, a partially faulty LUN in a disk array, or a disk with a few bad sectors or tracks.

If the hardware fault is not with the disk itself (for example, it is caused by problems with the controller or the cable path to the disk), you can use the vxedit command to unset the failing flag after correcting the source of the I/O error.

Warning:

Do not unset the failing flag if the reason for the I/O errors is unknown. If the disk hardware truly is failing, and the flag is cleared, there is a risk of data loss.

To clear the failing flag on a disk

Use the vxdisk list command to find out which disks are failing:

# vxdisk list

DEVICE   TYPE           DISK       GROUP    STATUS
   sdp      auto:sliced    mydg01     mydg     online
   sdq      auto:sliced    mydg02     mydg     online failing
   sdr      auto:sliced    mydg03     mydg     online
   . . .

Use the vxedit set command to clear the flag for each disk that is marked as failing (in this example, mydg02):
```
# vxedit -g mydg set failing=off mydg02
```

Use the vxdisk list command to verify that the failing flag has been cleared:

# vxdisk list

DEVICE   TYPE          DISK       GROUP    STATUS
   sdp      auto:sliced   mydg01     mydg     online
   sdq      auto:sliced   mydg02     mydg     online
   sdr      auto:sliced   mydg03     mydg     online
   . . .

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