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Chapter 9: Managing Logical Drives and Hot Spares ● 80
Changing the Read Cache Setting
When read caching is enabled, the controller monitors the read access to
a logical drive and, if it sees a pattern, pre-loads the cache with data that
seems most likely to be read next, increasing performance.
● Enabled—The controller transfers data from the logical drive to its
local cache in portions equal to the stripe size. Use this setting for
the best performance when workloads are steady and sequential.
Enabled is the default setting.
● Disabled—The controller transfers data from the logical drive to its
local cache in portions equal to the system I/O request size. Use this
setting for the best performance when workloads are random or the
system I/O requests are smaller than the stripe size. (For more
information about system I/O requests, refer to your operating
system documentation.)
To quickly change the read cache setting, click the logical drive you
want; then, in the menu bar, select Actions, click Configure read cache,
then select Enabled or Disabled as required.
Changing the Initialize Method
The Initialize Method setting determines how a logical drive is
initialized (prepared for reading and writing), and how long
initialization will take. The settings are presented in order of slowest to
fastest method.
● Build—(slowest) For RAID 1 logical drives, data is copied from the
primary drive to the mirror drive; for RAID 5 logical drives, parity is
computed and written. Build is the default setting.
Adaptec Storage Manager performs build initializations in the
background; you can use the logical drive immediately.
● Clear—Every block in the logical drive is overwritten, removing all
existing data. You can’t use the logical drive until the initialization is
complete.
● Quick—(fastest) The logical drive is made available immediately.
Quick initialization should be used for new physical disks only.