User's Manual

68 omreport storage: Using the Storage Reports
omreport storage arrays
Use the omreport storage arrays command to view detailed information about the disk controller and
the storage subsystems attached to the controller. The following information is provided about
the controller:
• ID — Assigned ID number for the controller.
• Name — Name of the controller.
• State — Current state of the controller.
• Firmware Version— Version of firmware installed on the controller.
For each controller, you can view the following information about the virtual disks controlled by
the controller:
• ID — Assigned ID number for the virtual disk.
• Status — Status of the virtual disk.
• Name — Name of the virtual disk.
• State — Current state of the virtual disk.
• Read Cache — Read policies indicate whether or not the controller should read sequential sectors of
the logical drive when seeking data. The read policies are as follows:
– Read-Ahead — When using read-ahead policy, the controller reads sequential sectors of the logical
drive when seeking data. Read-ahead policy may improve system performance if the data is
actually written to sequential sectors of the logical drive.
– No-Read-Ahead — Selecting no-read-ahead policy indicates that the controller should not use
read-ahead policy.
– Adaptive Read-Ahead — When using adaptive read-ahead policy, the controller initiates read-
ahead only if the two most recent read requests accessed sequential sectors of the disk. If
subsequent read requests access random sectors of the disk, the controller reverts to no-read-ahead
policy. The controller continues to evaluate whether read requests are accessing sequential sectors
of the disk, and can initiate read-ahead if necessary.