Lenovo ThinkServer RD330, Software User'S Manual

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Page 82
MegaRAID SAS Software User Guide Chapter 4: WebBIOS Configuration Utility
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Creating a Storage Configuration
The Virtual Drive Definition screen appears, as shown in Figure 42 . Use this screen to
select the RAID level, strip size, read policy, and other attributes for the new virtual
drives.
Figure 42: WebBIOS Virtual Drive Definition Screen
1. Change the virtual drive options from the defaults listed on the screen as needed.
Here are brief explanations of the virtual drive options:
— RAID Level: The drop-down menu lists the possible RAID levels for the virtual
drive. Select RAID 6.
— Strip Size: The strip size is the portion of a stripe that resides on a single drive in
the drive group. The stripe consists of the data segments that the RAID
controller writes across multiple drives, not including parity drives. For example,
consider a stripe that contains 64 KB of drive space and has 16 KB of data
residing on each drive in the stripe. In this case, the stripe size is 64 KB and the
strip size is 16 KB. You can set the strip size to 8, 16, 32, 64, 128, 256, 512, and
1024 KB. A larger strip size produces higher read performance. If your computer
regularly performs random read requests, choose a smaller strip size. The default
is 64 KB.
NOTE: WebBIOS does not not allow you to select 8KB as the stripe size when you create
a RAID 6 drive group with three drives.
— Access Policy: Select the type of data access that is allowed for this virtual drive:
RW : Allow read/write access. This is the default.
Read Only : Allow read-only access.