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Chapter 2 Overview of Disk Array Configuration Setting
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When binding pools or RANKs other than RAID0, data are still in the disks even when a single
physical disk (two physical disks for RAID6) fail(s). However, if one more physical disk fails, data
may be in danger of being lost.
To cope with this situation, the reliability of the disk array can be enhanced further by switching to a
reserve (i.e. Spare) disk which is set beforehand, at the point when a physical disk fails.
Spares can be set for physical disks which are not used in pool or RANK binding, thus making it
possible to recover data to a Spare in the same PD group when a physical disk fails. When recovery to
Spares is started, the pool or RANK is rebuilt and the Spares become physical disks which comprise the
pool or RANK. The failed physical disk can be replaced without stopping the access to the disk array.
Considering the physical layout, it is normally desirable to set one spare disk per DE for the physical
disk in the rightmost slot in the DE.
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Nicknames refer to any names that can be set for the disk array, the logical disk, the port, and the pool
with regard to iSM’s management target. Since the names thus set are stored in the disk array, they
are held regardless of whether iSM or a disk array is restarted or not.
(1) Disk Array Name
Refers to any ID name for iSM’s management target disk array. When the disk array is
specified with iSM, the disk array name is used.
(2) LD Name
Refers to any ID name for a logical disk in iSM’s management target disk array. When the
logical disk is specified with iSM, the LD name is used.
(3) Port Name
Refers to any ID name for a port in iSM’s management target disk array. When the port is
specified with iSM, the port name is used.
(4) Pool Name
Refers to any ID name for a pool in the iSM’s management target disk array. When the pool is
specified with iSM, the pool name is used.