Users Guide

Table 20. Memory channels (continued)
Property Definition
● Orphan drive — A physical disk in the foreign configuration has
configuration information that matches another physical disk that
is already a part of an array (either a foreign or a native array).
Layout Displays the RAID level of the foreign configuration.
Remarks Provides information about the foreign virtual disk. If the virtual disk
cannot be imported, the reason for failure is displayed.
● Exceeded maximum — The number of virtual disks selected for
import has exceeded the maximum number of supported disks.
● Missing physical disk or Missing span — One or more physical
disk(s) or span(s) in the virtual disk to be imported is missing.
● Unsupported — The selected RAID level is not supported on this
controller.
● Orphan drive — The physical disk has been replaced and is no
longer a part of the RAID volume. The configuration should be
cleared.
● Stale physical disk — The physical disk to be imported in the
virtual disk has outdated data.
● Partially foreign — The virtual disk is part of an already existing
configuration. Some physical disks in this virtual disk are foreign.
Dedicated Hot Spare Displays whether the foreign disk is a dedicated hot spare.
Based on the properties information, you can decide whether you want to import, recover, or clear the foreign configuration.
Viewing Patrol Read report
The patrol read report provides information on all the patrol reads performed on the controller in the chronological order. It
provides information such as last run time and result. If a patrol read fails, the reason for the failure is displayed.
Setting Patrol Read mode
NOTE: This task is not supported on PERC hardware controllers running in HBA mode.
Patrol read identifies disk errors in order to avoid disk failures and data loss or corruption. The Set Patrol Read task is
applicable only for disks used as virtual disks or hot spares.
The Set Patrol Read task runs in the background and corrects the disk errors, when possible. When the Set Patrol Read
mode is set to Auto, patrol read is initiated when the controller is idle for a specific period of time and when no other
background tasks are active. In this scenario, the patrol read enhances the system performance as disk errors can be identified
and corrected when there is no input/output activity on the disk.
The controller adjusts the amount of system resources dedicated for patrol read based on the amount of controller activity that
is competing with the Patrol Read task. When the controller activity is high, fewer system resources are dedicated to the patrol
read task.
Patrol Read does not run on a physical disk in the following circumstances:
● The physical disk is not included in a virtual disk or is assigned as a hot spare.
● The physical disk is included in a virtual disk that is currently undergoing one of the following:
○ Rebuild
○ Reconfiguration or reconstruction
○ Background initialization
○ Check consistency
In addition, the Patrol Read is suspended during heavy I/O activity and resumes when the I/O is finished.
To set Patrol Read mode, select the desired Patrol Read Mode option. The options available are:
Troubleshooting hardware issues
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