
58 IBM BladeCenter JS23 and JS43 Implementation Guide
RAID support
IBM BladeCenter JS23 Express has no RAID available.
IBM BladeCenter JS43 Express has support for RAID functions when there are
more than one SAS disk installed in the system. If there is only one drive then
there is no RAID function.
For two drives in the IBM BladeCenter JS43 Express, the supported RAID
functions are:
RAID 0 Striping.
RAID 1 Mirroring.
The drives on the Base Planar and MPE planar can be either rotating hard drives
(HDD) or solid state drives (SSD). However, the SAS controller will not place an
SSD and an HDD in the same RAID set.
Additionally, RAID can be done with different drives capacities, but you get only
the effective capacity of the smaller device.
Configuring a SAS RAID array
Two SAS disk drives in the IBM BladeCenter JS43 Express can be used to
implement and manage RAID level-0 and RAID level-1 arrays in operating
systems that are on the ServerProven list.
For the blade server, you must configure the SAS RAID array through smit
sasdam, which is the SAS Disk Array Manager for AIX.
The SAS Disk Array Manager is packaged with the Diagnostics utilities on the
Diagnostics CD. Use the command smit sasdam to configure the disk drives for
use with the SAS controller.
Important: For RAID operations, all drives must be of the same type. Either
HDD on both Base and MPE planars, or SDD on both Base and MPE planars.
Tip: Refer to Chapter 3 of IBM SAS RAID Controller for AIX for more details
on how to use the IBM SAS Disk Array Manager. This document is available at
http://publib.boulder.ibm.com/infocenter/systems/scope/hw/topic/areb
j/arebj.pdf
Important: Depending on your RAID configuration, you must create the array
before you install the operating system in the blade server.
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