PART C – RAID CONFIGURATION (CONT’D)
VIRTUAL DRIVE OPTIONS
+ RAID Level: The drop-down list shows the possible RAID levels for the virtual drive.
— RAID 0: Select this option for RAID 0.
— RAID 1: Select this option for RAID 1.
— RAID 5: Select this option for RAID 5.
— RAID 6: Select this option for RAID 6.
— RAID 00: Select this option for RAID 00.
— RAID 10: Select this option for RAID 10.
— RAID 50: Select this option for RAID 50.
— RAID 60: Select this option for RAID 60.
+ 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 KB, 16 KB, 32 KB, 64 KB, 128 KB, 256 KB, 512 KB, 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.
+ 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.
— Blocked: Do not allow access.
+ Read Policy: Specify the read policy for this virtual drive.
— No Read Ahead: This option disables the read ahead capability. This option is the default.
— Always Read Ahead: This option enables read ahead capability, which allows the controller to read sequentially ahead of requested data and to store the additional data in cache memory, anticipating that the data will be needed soon. This option speeds up reads for sequential data, but there is little improvement when accessing random data.
+ Write Policy: Specify the write policy for this virtual drive.
— Always Write Back: In Write back mode, the controller sends a data transfer completion signal to the host when the controller cache has received all of the data in a transaction. This setting is recommended in Standard mode.
— Write Through: In Write through mode, the controller sends a data transfer completion signal to the host when the drive subsystem has received all of the data in a transaction. This option is the default setting.
— Write Back with BBU: Select this mode if you want the controller to use Write back mode but the controller has no BBU or the BBU is bad. If you do choose this option, the controller firmware automatically switches to Write Through mode if it detects a bad or missing BBU.
+ IO Policy: The I/O policy applies to reads on a specific virtual drive. It does not affect the read ahead cache.
— Direct: In Direct I/O mode, reads are not buffered in cache memory. Data is transferred to the cache and the host concurrently. If the same data block is read again, it comes from cache memory. This option is the default setting.
— Cached: In Cached I/O mode, all reads are buffered in cache memory.
+ Drive Cache: Specify the drive cache policy.
— Enable: Enable the drive cache.
— Disable: Disable the drive cache. This option is the default setting.
— Unchanged: Leave the current drive cache policy as is.
+ Disable BGI: Specify the Background Initialization (BGI) status.
— No: Leave background initialization enabled, which means that a new configuration can be initialized in the background while you use WebBIOS to perform other configuration tasks. This option is the default setting.
— Yes: Select Yes if you do not want to allow background initializations for configurations on this controller.
+ Select Size: Specify the size of the virtual drive in MB, GB, or TB. Usually, this is the full size for RAID 0, RAID1, RAID 5, RAID 6, RAID 00, RAID 10, RAID 50, or RAID 60 shown in the Configuration panel on the right. You can specify a smaller size if you want to create other virtual drives on the same drive group.
+ Update Size: Click Update Size to update the Select size value for the selected RAID levels.
Accept the configuration and proceed:
The next step is to basically build the RAID 5 array. At this point you can either FAST INITIALIZE or SLOW INITIALIZE. Fact is, when you’re done configuring the array, it’s already initialized, so this step isn’t needed. The initialization will still proceed regardless in the background as the array builds, but you can use it as it is happening (so no need to wait).
Once initialization completes (if you do happen to pick FAST or SLOW manually), remember to SET BOOT DRIVE to our newly-created RAID 5 virtual drive. The CURRENT=NONE will change once you hit GO:
If you want to double-check everything, go to PROPERTIES. Most of the options you picked can be changed afterwards. Most, but not all, as a select few may require you to reinitialize your drives, which will clear all of your data; so make sure you get everything right the first time.
Now go back to the main LSI WebBIOS screen and go select CONTROLLER PROPERTIES:
You can change these at any time, but we kept them at default settings. For a more comprehensive description of each feature, check the upcoming tables.