LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Chapter 4: Ctrl-R Utility
Creating a Storage Configuration
You may press Advanced to set additional properties for the newly created virtual drive. For more information,
see Selecting Additional Virtual Drive Properties on page 59.
10. Press OK.
A dialog appears, asking you whether you want to initialize the virtual drive you just created.
11. To initialize the virtual drive, press OK.
The Create New VD dialog appears again.
12. Press Advanced.
The Create Virtual Drive- Advanced dialog appears.
Figure 31 Create Virtual Drive – Advanced
13. Select Initialize, and press OK.
The new virtual drive is created and initialized.
4.7.1 Selecting Additional Virtual Drive Properties
This section describes the following additional virtual drive properties that you can select while you create virtual
drives (Figure 31 on page 59). Change these parameters only if you have a specific reason for doing so. It is usually best
to keep them at their default settings.
Strip Size – The strip size is the portion of the stripe that resides on a single virtual drive in the drive group. Strip
sizes of 8 KB, 16 KB, 32 KB, 64 KB, 128 KB, 256 KB, 512 KB, or 1 MB are supported.
Read Policy – Specify one of the following options to specify the read policy for this virtual drive:
— Normal – Read ahead capability lets the controller read sequentially ahead of requested data and to store
the additional data in cache memory, thereby anticipating that the data will be needed soon. This process
speeds up reads for sequential data, but there is little improvement when the computer accesses random
data.
— Ahead – Disables the read ahead capability.
Write Policy – Select one of the following options to specify the write policy for this virtual drive:
— Write Thru – In this mode, the controller sends a data transfer completion signal to the host when the drive
subsystem has received all the data in a transaction. This option eliminates the risk of losing cached data in
case of a power failure.
— Write Back – In this mode, the controller sends a data transfer completion signal to the host when the
controller cache has received all the data in a transaction.
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