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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 addlog volume [loglen=length] |
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| NOTE: 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:
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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