Asus LSI SAS3442X-R - Manual (Page 38)

4-2 Overview of Integrated Striping
Version 1.1 Copyright © 2006, 2007 by LSI Logic Corporation. All rights reserved.
4.2 IS Features
Integrated Striping supports the following features:
•
Support for volumes with two to ten disks
•
Support for two IS volumes (or one IS volume and one IM/IME
volume) on a controller, with up to 12 disks total. (Requires
Integrated RAID firmware v1.20.00 or above.)
Note: All physical disks in a volume must be connected to the
same SAS controller.
•
Presents a single virtual drive to the OS for each configured volume
•
Support for both SAS and SATA drives, although the two types of
drives cannot be combined in one volume
•
Fusion-MPT architecture
•
Easy-to-use SAS BIOS configuration utility
•
Error notification
•
Use of metadata to store volume configuration on disks
•
OS-specific event log
•
Error display inside the Fusion-MPT BIOS
•
SES status LED support for drives used in IS volumes
4.3 IS Description
The IS feature writes data across multiple disks instead of onto one disk.
This is accomplished by partitioning each disk’s storage space into
64-KB stripes. These stripes are interleaved round-robin, so that the
combined storage space is composed alternately of stripes from each
disk.
For example, as shown in Figure 4.1 , segment 1 is written to disk 1,
segment 2 is written to disk 2, segment 3 is written to disk 3, and so on.
When the system reaches the end of the disk list, it continues writing
data at the next available segment of disk 1.