Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Note: When you remove a log and it leaves less than two valid logs on the volume,
a warning is printed and the operation is stopped. You can force the operation by
specifying the -f option with vxplex or vxassist.
Administering volumes
Adding a RAID-5 log
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