124 Maintaining a Storage Array
For best results, run all three tests at initial installation. Also, run the tests any
time you make changes to the storage array or to components connected to
the storage array (such as hubs, switches, and host adapters).
A custom data pattern file called diagnosticsDataPattern.dpf is included on
the Utility directory of the installation CD. You can modify this file, but the
file must have the following properties to work correctly for the tests:
• The file values must be entered in hexadecimal format (00 to FF) with
only one space between the values.
• The file must be no larger than 64 bytes in size. Smaller files can be used,
but larger files can cause an error.
The test results contain a generic, overall status message and a set of specific
test results. Each test result contains the following information:
• Test (read/write/data loopback)
• Port (read/write)
• Level (internal/external)
• Status (pass/fail)
Events are written to the MEL when diagnostics are started and when testing
is completed. These events help you to evaluate whether diagnostics testing
was successful or failed and the reason for the failure.
Recovery operations involve replacing failed RAID controller modules and
physical disks, restoring data, and restoring the storage array to operation.
Setting RAID Controller Module Operational Mode
A RAID controller module has three operational modes:
CAUTION: Placing a RAID controller module offline can cause loss of data.
book.book Page 124 Wednesday, June 8, 2011 12:20 PM