VERITAS Volume Manager 4.1 Administrator's Guide

Administering Volumes
Adding a RAID-5 Log
Chapter 8286
The attach operation can only proceed if the size of the new log is large
enough to hold all of the data on the stripe. If the RAID-5 volume already
contains logs, the new log length is the minimum of each individual log
length. This is because the new log is a mirror of the old logs.
If the RAID-5 volume is not enabled, the new log is marked as BADLOG
and is enabled when the volume is started. However, the contents of the
log are ignored.
If the RAID-5 volume is enabled and has other enabled RAID-5 logs, the
new log’s contents are synchronized with the other logs.
If the RAID-5 volume currently has no enabled logs, the new log is zeroed
before it is enabled.