Veritas Volume Manager 4.1 Troubleshooting Guide (HP-UX 11i v3, February 2007)

Understanding Messages
60 VERITAS Volume Manager Troubleshooting Guide
V-5-0-249
VxVM vxio WARNING V-5-0-249 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.
V-5-0-251
VxVM vxio WARNING V-5-0-251 read error on object object of mirror plex
in volume volume (start offset length length)
◆ Description: An error was detected while reading from a mirror. This error 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 this error occurs often, but never leads to a plex detach, there may 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 volume is not mirrored, this message indicates that some data could not be read.
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.
Note This message may also appear during a plex detach operation in a cluster. In
this case, no action is required.