Compaq ProLiant Cluster HA/F500 Administrator Guide

Secure Path Installation Procedures
4-16 ProLiant Cluster HA/F500 for MA8000 Administrator Guide
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3. Drop the disk icon anywhere you see the squared arrow along the “new” primary
(formerly alternate).
When the primary path reassignment of a disk completes, its icon is displayed in
original form, shaded gray and yellow, on the new path. (It may appear above or
beneath the path line, depending on your exact placement of the mouse). Repeat
this procedure for each disk that is to be assigned a new primary path.
The Manager does not permit a new primary path assignment to a failed path. If an
attempt is made to move a drive to a failed path, the Manager returns the drive to the
original path. A pop-up window also appears stating that the failback was not
successful.
NOTE: The order and spacing of the disk icons displayed on the paths is refreshed every
90 seconds, and can be refreshed any time by using the View/Refresh pull-down menu of the
Manager window or by pressing the F5 key.
Balancing the I/O Load Between Paths
As the storage demands of the Secure Path environment are defined and individual
drive throughput requirements are understood, Compaq recommends that you evenly
balance the disks generating the highest I/O loads between the two paths to maximize
overall throughput. The Manager may be used to statically load-balance the Secure
Path configuration by following the procedure below:
1. Identify “hot” drives which are the drives that consistently experience the
greatest I/O load while running workloads typical of the production environment.
Enable operating system disk performance statistics, if you have not done so
already, by issuing diskperf -y from a command window and restarting the
system.
Use Windows NT Performance Monitor to characterize individual drive loading
in terms of throughput (I/Os per second) and/or bandwidth (bytes per second),
whichever is more appropriate for the application.
2. Note the path assignments of hot drives.
3. Balance the overall I/O load, as much as possible, by evenly distributing
(reassigning primary drive path) the hot drives between the two paths.
Run the workload, monitor the operation, and readjust as necessary.