RAID-5 guidelines
Refer to the following guidelines when using RAID-5.
In general, the guidelines for mirroring and striping together also apply to RAID-5. The following guidelines should also be observed with RAID-5:
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Only one RAID-5 plex can exist per RAID-5 volume (but there can be multiple log plexes).
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The RAID-5 plex must be derived from at least three subdisks on three or more physical disks. If any log plexes exist, they must belong to disks other than those used for the RAID-5 plex.
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RAID-5 logs can be mirrored and striped.
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If the volume length is not explicitly specified, it is set to the length of any RAID-5 plex associated with the volume; otherwise, it is set to zero. If you specify the volume length, it must be a multiple of the stripe-unit size of the associated RAID-5 plex, if any.
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If the log length is not explicitly specified, it is set to the length of the smallest RAID-5 log plex that is associated, if any. If no RAID-5 log plexes are associated, it is set to zero.
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Sparse RAID-5 log plexes are not valid.
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RAID-5 volumes are not supported for sharing in a cluster.
See "RAID-5 (striping with parity)" on page 45.
