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
disk 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:
- Only SAS hard disk drives are
supported by the SAS RAID controller module.
- If you are installing both disk storage modules, hard disk drives should
be installed evenly across the disk 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.
-
Battery backup unit 1
provides backup support for the SAS RAID controller module installed
in I/O module bay 3.
-
Battery backup unit 2
provides backup support for the SAS RAID controller module installed
in I/O module bay 4.