User`s guide

PERC 5 Features 23
Configuration
You can use the storage management application to select the Patrol Read options. Use Patrol Read options
to set automatic or manual operation, or disable Patrol Read.
The following sections describe Patrol Read
functions and operations available in the
Storage Management application .
NOTE: See the storage management application’s documentation for more information about the Patrol Read
configuration features available.
Patrol Read Modes
The following describes the scheduling details for Patrol Read:
1
By default the controller sets the Patrol Read to Auto mode. You can set the Patrol Read to either Auto
or
Manual mode.
2 In Auto mode, Patrol Read runs continuously on the system and is scheduled to start a new Patrol Read
within seven days after the last iteration is completed.
3 When Patrol Read Mode is changed from Auto to Manual , or Auto to Disabled , the Next execution
will start at:
field will be set to N/A .
Behavior Details
The behavior details of Patrol Read are as follows:
1
Setting Patrol Read in Manual mode does not start Patrol Read. It only sets the mode so that you can
select
Start whenever you want to run Patrol Read. When the mode is set to Manual , it remains in that
mode until you change it.
2 Setting the mode to Automatic starts Patrol Read. When the Patrol Read operation is complete, it will
set itself to run within seven days of the last iteration.
Blocked Operations
If any of the following conditions exist, then Patrol Read will not run on any of the affected disks:
• An unconfigured disk (the disk is in the READY state)
• Disks that are members of a virtual disk undergoing a reconstruction
• Disks that are members of a virtual disk undergoing a Background Initialization or Consistency Check
Dell_PERC5_UG.book Page 23 Tuesday, February 13, 2007 6:02 PM