User's Manual

Controllers 91
NOTE: On replacing a SMART error drive with a good drive on PERC4/IM
controllers, it is necessary to perform a rescan operation on the controller, for
Storage Management to display the correct status of the newly inserted drive.
Background Initialization on PERC Controllers
On PERC controllers, background initialization of a redundant virtual disk
begins automatically within 0 to 5 minutes after the virtual disk is created.
The background initialization of a redundant virtual disk prepares the virtual
disk to maintain redundant data and improves write performance. For
example, after the background initialization of a RAID 5 virtual disk
completes, the parity information has been initialized. After the background
initialization of a RAID 1 virtual disk completes, the physical disks are
mirrored.
The background initialization process helps the controller identify and
correct problems that may occur with the redundant data at a later time. In
this regard, the background initialization process is similar to a check
consistency.
The background initialization should be allowed to run to completion. If
cancelled, the background initialization automatically restarts within 0 to 5
minutes. Some processes such as read and write operations are possible while
the background initialization is running. Other processes, such as creating a
virtual disk, cannot be run concurrently with a background initialization.
These processes cause the background initialization to cancel.
Non-RAID Controller Description
The non-RAID SCSI and SAS controllers are non-RAID controllers that
support SCSI and SAS devices. Because these controllers are non-RAID, they
do not support virtual disks. You can manage these non-RAID controllers and
their attached SCSI and SAS devices with Storage Management.
NOTE: Supported features may vary from controller to controller.
Non-RAID SCSI Controllers
The LSI PCI-e U320 non-RAID controllers use Small Computer System
Interface (SCSI) technology.
The ITA for LSI PCI-e U320 SCSI non-RAID
controllers is supported in this release.