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

VERITAS Volume Manager 4.1 Release Notes
Known Problems and Workarounds
Chapter 132
To prevent this possibility in situations where mirrored volumes are not used, the threshold
should be tuned to a sufficiently high value that is unlikely to be reached. For example, to
change the value of dmp_failed_io_threshold to 16 hours (57600 seconds), modify the value
defined in /kernel/drv/vxdmp.conf as shown here:
dmp_failed_io_threshold=57600
After changing the value, reboot the system.
In situations in which mirrored volumes are in use, and an application time-out is being hit
when there is still a valid plex with the data, the value of dmp_failed_io_threshold can be
tuned to a smaller value so that the I/O can succeed on the mirror without triggering an
application failure.
Device Issues
Rootability Cloning Script May Yield Too Many Processes Error
• Problem: Running the VXVM rootability cloning script, vxcp_lvmroot, may yield the
following error message if your nproc tunable is set to the default of 276:
/etc/vx/bin/vxcp_lvmroot[47]: The fork function failed. Too many
already exist.
sh: The fork function failed. Too many processes already exist.
• Workaround: Increase the nproc static tunable to 1024 using sam(1M), rebuild a new
kernel, reboot your machine, and try the vxcp_lvmroot again.
Business Copy (BC) Limitation on XP Disk Arrays
• Problem: Base-VXVM will allow an import of the volumes from only one BC on a node
where volumes have the same disk and group identification. If the Primary (P-Vol) is
accessible, then this volume will be used. The Secondary (S-Vol) is only imported if the
P-Vol is inaccessible at the time of import. There is currently no ability to change the disk
group identification (group id) on XP BC volumes.
• Workaround: None
NOTE In the case where VxVM and XP512 BCs are being used together; if the BCs are
split, you cannot then import the split BC to the machine on which P-Vol is
currently being used. The reason for this is that the split BC and the P-Vol will