
Chapter 3. Technical description of the hardware architecture 57
3.8.6 Serial Attached SCSI (SAS) storage subsystem
IBM BladeCenter JS23 and JS43 Express uses an embedded SAS controller
that operates at 32-bit PCI-X at 133MHz.
On IBM BladeCenter JS23 Express there are four SAS ports. Two of them are
wired to the SAS hard drive, and the other two go to the CIOv PCI-e connector,
connecting to the Blade Center SAS Switch bay 3 and bay 4, when a SAS paddle
card is used in the CIOv connector.
In Blade Center S, these two SAS ports are connected to the two Data Storage
Modules (DSM) via the SAS Switch in bay 3 and bay 4. In Blade Center H,
external storage are connected via the four external ports of the SAS Switches in
bay 3 and bay 4.
IBM BladeCenter JS43 Express has four SAS ports that goes from the Base
planar to the MPE planar, and they are used in similar functions as those on
Base planar. IBM BladeCenter JS43 Express has only one SAS controller,
located in the Base planar.
The boot HDD can either be on the Base or MPE planar of an IBM BladeCenter
JS43 Express. The boot disk can also be from a Blade Center HDD via CIOv
SAS paddle card.
SAS Drive
IBM BladeCenter JS23 and JS43 Express supports SAS 2.5” Hard Disk Drive
(HDD) or SAS 2.5” Solid Disk Drive (SDD).
For a complete list of the supported SAS disks, please refer to Table 2-3 on
page 12.
Note: The SAS Drive in the JS23 Base planar is not hotpluggable.
Tip: It is recommended to install the boot HDD on the Base planar of the IBM
BladeCenter JS43 Express.
Important: SSD drivers are formatted in 528-Byte sector, and the SAS
controller won’t write to them in case it finds there are configuration sectors
that are not clean. This situation happens when the SDD was previously used
in RAID application. To be able to write to the SSD again, you will need to
reformat it.
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