Exp12S Sas Expansion Drawer; Totalstorage Exp24 Disk Drawer And Tower; Ibm 7031 Totalstorage Exp24 - IBM Power 750 Technical Overview And Introduction

An EXP24S drawer in mode 4 can be attached to two or four SAS controllers and provide
much configuration flexibility. An EXP24S in mode 2 has similar flexibility. Up to 24 HDDs can
be supported with any of the supported SAS adapters or controllers.
Include the EXP24S drawer no-charge specify codes with any EXP24S orders to indicate to
IBM manufacturing the mode to which the drawer should be set. The drawer is delivered with
this configuration.
Notes:
The modes for the EXP24S drawer are set by IBM manufacturing. There is no option to
reset after the drawer is shipped.
If you order multiple EXP24S drawers, avoid mixing modes within that order. There is
no externally visible indicator regarding the drawer's mode.
Several EXP24S cannot be cascaded on the external SAS connector. Only one
FC 5887 drawer is supported.
The Power 750 or Power 760 supports up to 51 EXP24S SFF drawers.
The EXP24S Drawer rails are fixed length and designed to fit Power Systems provided
racks of 28 inches (711 mm) deep. Other racks might have different depths, and these
rails will not adjust. No adjustable depth rails are orderable at this time.
For details about the SAS cabling, see "Planning for serial-attached SCSI cables" in the
information center:
http://pic.dhe.ibm.com/infocenter/powersys/v3r1m5/index.jsp?topic=/p7had/p7hadsasc
abling.htm

2.10.3 EXP12S SAS expansion drawer

The EXP12S (FC 5886) is an expansion drawer with twelve 3.5-inch form factor SAS bays.
This drawer supports up to 12 hot-swap SAS HDDs or up to eight hot-swap SSDs. The
EXP12S includes redundant AC power supplies and two power cords. Although the drawer is
one set of 12 drives, which is run by one SAS controller or one pair of SAS controllers, it has
two SAS attachment ports and two service managers for redundancy. The EXP12S takes up
a 2U space in a 19-inch rack and the SAS controller can be a SAS PCIe adapter or pair
of adapters.
A maximum number of 27 EXP12S drawers can be attached to a Power 750 and Power 760
server.
Notice: The EXP12S SAS expansion drawer is supported, but no longer orderable.

2.10.4 TotalStorage EXP24 disk drawer and tower

The TotalStorage EXP24 is not supported with the Power 750 and Power 760 server.

2.10.5 IBM 7031 TotalStorage EXP24

The IBM 7031 TotalStorage EXP24 Ultra320 SCSI Expandable Storage Disk Enclosure is not
supported with the Power 750 and Power 760 server.
Chapter 2. Architecture and technical overview
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