Veritas Volume Manager 5.0 Troubleshooting Guide Guide (September 2006)

64 Error messages
Understanding messages
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.
V-5-0-252
VxVM vxio NOTICE V-5-0-252 read error on object subdisk of mirror
plex in volume volume (start offset length length) corrected
■ Description: A read error occurred, which caused a read of an alternate mirror and a
writeback to the failing region. This writeback was successful and the data was
corrected on disk.
■ Action: None; the problem was corrected automatically. Note the location of the
failure for future reference. If the same region of the subdisk fails again, this may
indicate a more insidious failure and the disk should be reformatted at the next
reasonable opportunity.
V-5-0-258
VxVM vxdmp NOTICE V-5-0-258 removed disk array disk_array_serial_number
■ Description: A disk array has been disconnected from the host, or some hardware
failure has resulted in the disk array becoming inaccessible to the host.
■ Action: Replace disk array hardware if this has failed.