VERITAS Volume Manager 3.5 Troubleshooting Guide (August 2002)

Chapter 3, Error Messages

Kernel Warning Messages

vxvm:vxio:WARNING: RAID-5 volume entering degraded mode operation

◆ Description: An uncorrectable error has forced a subdisk to detach. At this point, not

all data disks exist to provide the data upon request. Instead, parity regions are used

to regenerate the data for each stripe in the array. Consequently, access takes longer

and involves reading from all drives in the stripe.

◆ Action: Check for other console error messages that indicate the cause of the failure.

Replace any failed disks as soon as possible.

vxvm:vxio:WARNING: read error on mirror plex of volume volume offset

offset length length

◆ Description: Anerrorwas detected while readingfrom a mirror. Thiserror may lead to

further action shown by later error messages.

◆ Action: If the volume is mirrored, no further action is necessary since the alternate

mirror’s contents will be written to the failing mirror; this is often sufﬁcient to correct

media failures. If thiserroroccurs often,but never leadsto aplex detach,theremay be

a marginally defective region on the disk at the position indicated. It may eventually

be necessary to remove data from this disk (see the vxevac(1M) manual page) and

then to reformat the drive.

If the volumeis notmirrored, this messageindicates that some data couldnot beread.

The ﬁle system or other application reading the data may report an additional error,

but in either event, data has been lost. The volume can be partially salvaged and

moved to another location if desired.

vxvm:vxio:WARNING: subdisk subdisk failed in plex plex in volume volume

◆ Description: The kernel has detected a subdisk failure, which may mean that the

underlying disk is failing.

◆ Action: Check for obvious problems with the disk (such as a disconnected cable). If

hot-relocation is enabled and the disk is failing, recovery from subdisk failure is

handled automatically.

vxvm:vxio:WARNING: write error on mirror plex of volume volume offset

offset length length

◆ Description: An error was detected while writing to a mirror. This error will generally

be followed by a detach message, unless the volume is not mirrored.

◆ Action: The disk reporting the error is failing to correctly store written data. If the

volume is not mirrored, consider removing the data and reformatting the disk. If the

volume is mirrored, it will become detached and you should replace or reformat the

disk.