VERITAS Volume Manager 4.1 Release Notes (5900-0591, March 2010)

VERITAS Volume Manager 4.1 Release Notes
Known Problems and Workarounds
Chapter 136
seconds). In particular, shared disk groups are marked disabled and no information about
them is available during this time. The vxconfigd program must therefore be started on the
master first.
Messages Caused by Open Volume Devices
When a node aborts from the cluster, open volume devices in shared disk groups on which I/O
is not active are not removed until the volumes are closed. If this node later joins the cluster
as the master while these volumes are still open, the presence of these volumes does not cause
a problem. However, if the node tries to rejoin the cluster as a slave, this can fail with the
following error message:
cannot assign minor #
This message is accompanied by the console message:
WARNING:minor number ### disk group group in use
Data Integrity Issues
Disks with Write-Back Caches
Disk drives configured to use a write-back cache, or disk arrays configured with volatile
write-back cache, exhibit data integrity problems. The problems occur after a power failure,
SCSI bus reset, or other event in which the disk has cached data, but has not yet written it to
non-volatile storage. Contact your disk drive or disk array manufacturer to determine
whether your system disk drives use a write-back cache, and if the configuration can be
changed to disable write-back-caching.
Snapshot and Snapback Issues
Using Snapshots as Root Disks
It is recommended that you do not use snapshots of the root volume as a bootable volume. A
snapshot can be taken to preserve the data of the root volume, but the snapshot will not be
bootable. The data from the snapshot would have to be restored to the original root volume
before the machine could be booted with the preserved data.
Warning Message when Taking a Snapshot of a SFCFS File System
When taking a snapshot of a SFCFS file system, the following warning message might
appear:
VxVM vxio WARNING V-5-0-4 Plex plex detached from volume volume