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Appendix
● Method a, Adding a new group, does not affect the already existing config-
uration and HDDs. FGI for the LUNs in the new group is recommended.
However, BGI can also be performed in order to continue with the host
access. During the FGI of the new group normal host traffic can continue.
Method a is strongly recommended!
In case of methods b and c, the existing RAID sets will be migrated. Stripes
are newly computed. A former RAID 1 may be changed into a RAID 0 +1. The
added capacity will be used in total to create the new group or enlarged LUN.
This takes a very long time. There is only one controller active! It is only
possible when a Multi Path software is installed or there is no data transfer. The
process is not interruptible and no attempt should be made to force any
interruption (i.e. switching off or pulling disks)! While migration is active,
RAID no protection is given.
● For the Solaris OS method c, enlarging an existing LUN, is not allowed
since it could cause data corruption!
● In case of methods b and c, the Expand Capacity operation takes a really
long time (up to 15 days for a stripe size of 8k!) There is no RAID protection
during that time!
We strongly recommend to prefer a different way to add capacity to the
system: backup / delete old configuration / build new configuration with the
added capacity / restore data.
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