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Planning for SAS RAID controller module
The SAS RAID controller module is a SAS switch and a RAID controller packaged
into a single module. It is designed to enable you to share the integrated storage
among all blade servers in the BladeCenter S chassis and implement a RAID
solution for that storage.
Each SAS RAID controller module provides internal ports to communicate with the
hard disk drives in each of the storage modules. In addition, the SAS RAID
controller module communicates with each of the ports on the SAS expansion card
option that is installed in a blade server (the SAS expansion card option provides
two ports). This provides a redundant path to the SAS RAID controller modules.
Note:
External ports on the SAS RAID controller module are not currently
supported.
You must install two SAS RAID controller modules, one in I/O module bay 3 and
the other in I/O module bay 4. In addition, you must install a SAS expansion card
option in each of the blade servers that will have access to the integrated shared
storage.
Note:
v
Only SAS hard disk drives are supported by the SAS RAID controller module.
v
If you are installing both storage modules, hard disk drives should be installed
evenly across the storage modules. Depending on your storage pool
configuration, this enables you to split primary and secondary volumes so that
the storage pool will remain viable if one of the storage modules goes offline.
Battery backup units provide backup of the SAS RAID controller module cache so
that data is not lost in the event of a power failure. Battery backup units are
required. Each battery backup unit provides backup support for one of the SAS
RAID controller modules.
v
Battery backup unit 1 provides backup support for the SAS RAID controller
module installed in I/O module bay 3.
v
Battery backup unit 2 provides backup support for the SAS RAID controller
module installed in I/O module bay 4.
Defining storage pools
The SAS RAID controller modules support the implementation of RAID 0, RAID 1,
RAID 5, and RAID 0+1. Typically, you will define two storage pools.
A
storage pool
(also called a
RAID array
) is a collection of disk drives that become a
logical entity. When you create a storage pool, you select the desired capacity
(number of disk drives) and assign a RAID level to it which will provide a
redundancy level.
Storage pools are assigned to a primary SAS RAID controller module when they
are created. Defining two or more storage pools, and alternating storage pool
ownership between the two SAS RAID controller modules will generally result in
better performance.
Note:
When defining storage pools using Storage Configuration Manager Web
interface, the system will automatically select the primary controller for a new
storage pool to maximize balanced performance.
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BladeCenter S Type 7779/8886: Planning Guide
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