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56 Management Applications for PERC Cards
When you define the virtual disks, you can set the following virtual disk
parameters:
•RAID level
• Stripe element size
•Read policy
•Write policy
• Type of initialization
• Hot spare configuration
NOTE: The default hard drive cache policy for a virtual disk composed with SAS
hard drives is disabled and with SATA hard drives is enabled. The Virtual Disk
parameter can not be changed in the BIOS Configuration Utility (<Ctrl><R>). Use
Dell OpenManage Storage Management for the hard drive cache setting operation.
Table 5-2 shows the parameters that you can configure when defining
virtual disks.
Table 5-2. Virtual Disk Parameters and Descriptions
Parameter Description
RAID Level RAID Level specifies whether the virtual disk is RAID 0, 1, 5, 6, 10,
50, or 60. The number of disks, disk capacity, the requirements for
fault tolerance, performance, and capacity should be considered when
selecting the RAID level. For more information, see "Summary of
RAID Levels" on page 129.
Stripe
Element Size
Stripe Element Size specifies the size of the segments written to each
physical disk in a RAID 0, 1, 5, 6, 10, 50, and 60 virtual disk. You can
set the stripe element size to 64 KB, 128 KB, 256 KB, 512 KB, or 1024
KB. The default and recommended stripe element size is 64 KB.
A larger stripe element size provides better read performance if your
system mostly does sequential reads.