HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and Configuration Guide

Planning Storage Configurations
2–26 HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and
Configuration Guide
Plan the mirrorset members, and plan the stripeset that will contain them. Review the
recommendations in “Planning Considerations for Storageset,” page 2–18, and
“Mirrorset Planning Considerations,” page 2–21.
Storageset Expansion Considerations
Storageset Expansion allows for the joining of two of the same kind of storage
containers by concatenating RAIDsets, Stripesets, or individual disks, thereby forming
a larger virtual disk which is presented as a single unit. The StorageWorks HSG80
Array Controller ACS Version 8.7 CLI Reference Guide describes the CLI command:
ADD CONCATSETS which is used to perform concatenation.
CAUTION: Use the ADD CONCATSETS command only with host operating systems that
support dynamic volume expansion. Use of this command could result in inacessible
data, if the operating system cannot handle one of its disks increasing in size.
Partition Planning Considerations
Use partitions to divide a container (storageset or individual disk drive) into smaller
pieces, each of which can be presented to the host as its own storage unit. Figure 2–12
shows the conceptual effects of partitioning a single-disk container.
Figure 2–12: One example of a partitioned single-disk unit
You can create up to eight partitions per storageset (disk drive, RAIDset, mirrorset,
stripeset, or striped mirrorset). Each partition has its own unit number so that the host
can send I/O requests to the partition just as it would to any unpartitioned storageset or
device. Partitions are separately addressable storage units; therefore, you can partition
a single storageset to service more than one user group or application.
1 Partition 1
2 Partition 2
3 Partition 3
1
2
3
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