Specifications

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Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
An unpartitioned storage unit has more capacity than a partition that uses the whole
unit because each partition requires five blocks of administrative metadata. Thus, a
single disk unit that contains one partition can store n-5 blocks of user or application
data.
See “Guidelines for Partitioning Storagesets and Disk Drives,” page 4–35, for
information on manually partitioning a storageset or single-disk unit.
Guidelines for Partitioning Storagesets and
Disk Drives
Keep these points in mind as you plan your partitions:
■ You can create up to eight partitions per storageset or disk drive.
■ All of the partitions on the same storageset or disk drive must be addressed
through the same controller port. This ensures a transparent failover of devices
should one of the dual-redundant controllers fail.
■ Partitions cannot be combined into storagesets. For example, you cannot divide a
disk drive into three partitions, then combine those partitions into a RAIDset.
■ Partitioned storagesets cannot function in multiple-bus failover dual-redundant
configurations. Because they are not supported, you must delete your partitions
before configuring the controllers for multiple-bus failover.
■ Once you partition a container, you cannot unpartition it without reinitializing the
container.
■ Just as with storagesets, you do not have to assign unit numbers to partitions until
you are ready to use them.