User`s guide

6.11.5 MIRROR disk-device-name container-name Command
Allows you to convert a physical device to a one member mirrorset.
CLI> MIRROR disk-device-name mirrorset-container-name
For example:
CLI> MIRROR DISK100 MR1
6.11.6 UNMIRROR disk_device-name
Allows you to convert a one member mirrorset back to a physical device.
CLI> UNMIRROR disk-device-name
Refer to Section 7.3.12 for mirrorset examples performed by the CLONE utility.
6.12 RAIDset and Mirrorset Availability, Performance, and Cost
RAIDset size (and RAID level) recommendations depend on whether availability,
performance, or cost is the priority for creating RAIDsets. Tradeoffs must be
made because no single RAID level provides the perfect balance of availability,
performance, and cost. You need to determine what your priorities are before
creating your RAIDsets or stripesets.
For availability and performance, it is important to put each RAIDset member
on a different port (bus). This keeps the RAIDset from going inoperative in the
event of a single port failure, and also provides better performance.
RAID level 5 is more economical for large RAIDsets than smaller RAIDsets
because the cost of the parity blocks is amortized across a larger number of
devices. However, large RAIDsets statistically have higher failure rates.
Stripesets provide high performance and a lower cost (no parity disk to buy), but
do not provide redundancy for availability.
Mirrorsets provide maximum availability and potentially improved read
performance, but at the greatest cost.
Working with RAID Arrays 6–25