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Compaq Smart Array 3200 Controller Reference Guide
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: F-CH05.DOC Last Saved On: 12/7/98 1:22 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Accelerator Ratio
The Smart Array 3200 Controller has an onboard cache, called an Array
Accelerator, that performs both write-posting and read-ahead caching. The
setting in CPQONLIN determines the amount of memory allocated to the read
and write caches. For example, if the Accelerator Ratio is set to Read 75% -
Write 25%, then 75% of Array Accelerator cache is dedicated to read-ahead
cache and 25% is dedicated to the write-posting cache. This option can be
modified from the Controller Settings menu when the Array Accelerator is
installed.
Expand an Array
During an expand, performance may be slightly degraded. In most cases,
however, any potential degradation is offset by the addition of physical drives.
Some tips for expanding are:
■ Perform the expand process during periods of low server use. If you
must expand during peak periods, the Array Configuration Utility for
NetWare allows you to set the priority of the expand. Setting the priority
to LOW will affect performance the least, but it will take longer for the
new space to become available.
■ When expanding, you must add drives of at least the same capacity as
the smallest drive in the array. Adding larger drives wastes space
because only the space that is equal to the smallest drive size can be
used.
Add or Configure Spare Drives
When adding a spare drive to an array, you must have an unassigned drive or a
drive already assigned as a spare on another array. You can assign a single spare
to as many arrays as you want, or assign separate spares. When you select
Assign Spare Drive, only drives that qualify will appear (for example, only
those spares that are large enough will appear). If drives that you expect to see
do not appear, switch to the physical drive view (TAB key), and check the size
of the drives. The spare must be as large as the smallest drive in the array.