Users Guide

Table Of Contents
NOTE: The default setting for Disk Cache Policy for virtual disks based on SATA drives is Enabled, and for virtual disks
based on SAS drives is Disabled.
NOTE: For SAS 6i/R and PERC H200 family of controllers, the Disk Cache Policy setting is available only after creating
the virtual disk.
Related Task
Changing The Virtual Disk Policy
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 improve write performance. For example, after the background initialization of a RAID 5 virtual disk completes, the
parity information is 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
later. In this regard, the background initialization process is similar to a check consistency.
The background initialization should be allowed to run to completion. If canceled, 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. However, other processes such as creating a virtual disk, cannot be run concurrently with 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 SAS Controllers
The following non-RAID controllers use Serial Attached SCSI (SAS) technology:
HBA355i, HBA355e
HBA330MMZ, HBA350iMX on PowerEdge MX750c
NOTE:
Storage Management only enumerates and provides the PCI slot information for Broadcom SAS 9207-8e and SAS
9300-8e controllers. As Storage Management does not monitor these non-RAID controllers, devices connected to these
controllers are not enumerated, alerts are not logged, and SNMP traps are not sent for these controllers.
NOTE: In Storage Management, the Broadcom SAS HBA controller page display properties such as: ID, Status, Name,
Slot ID, State, Driver Version, Storport Driver Version, Number of Connectors, Controller Tasks, and Firmware
Version.
NOTE: A logical connector is displayed for all PERC 10 and later family of hardware controllers, HBA controllers, and MX
series controllers all the physical disks will be detected under this logical connector. However, the logical connector will not
be displayed under PERC 9 and prior family of hardware controllers,12 Gbps HBA and PERC H840.
NOTE: For SAS 12 Gbps HBA and HBA 330 controller, the Available Reports that can be viewed are View Slot Occupancy
Report and View Physical Disk Firmware Version Report.
NOTE: At times, the connector ID for SAS 12 Gbps HBA may not be displayed correctly on Storage Management. This
occurs because of a firmware limitation in the SAS 12 Gbps HBA. However, this connector ID discrepancy does not cause
any functional limitation.
50 Controllers