Lenovo ThinkServer RD330 MegaRAID SAS Software User Guide - Page 82

Chapter 4: WebBIOS Configuration Utility | Creating a Storage Configuration MegaRAID SAS Software User Guide 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. Page 82 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.