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 | NOTE: You may need an additional license to use this feature. |
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Only one RAID-5 plex
can exist per RAID-5 volume. Any additional plexes become RAID-5
log plexes, which are used to log information about data and parity
being written to the volume. When a RAID-5 volume is created using
the vxassist command, a log plex is created for that volume by default.
To add a RAID-5 log to an existing volume, use the following command:
# vxassist [-b] addlog volume [loglen=length]
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| NOTE: If specified, the -b option makes adding the new log
a background task.You can specify the log length used when adding the
first log to a volume. Any logs that you add subsequently are configured
with the same length as the existing log. |
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For example, to create a log for the RAID-5 volume volraid,
use the following command:
# vxassist addlog volraid
Adding
a RAID-5 Log using vxplex |
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As an alternative to using vxassist, you can add a RAID-5
log using the vxplex command. For example, to attach a RAID-5 log
plex, r5log, to a RAID-5 volume, r5vol, use the following command:
# vxplex att r5vol r5log
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.
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