Specifications

24 IBM Power 770 and 780 Technical Overview and Introduction
The I/O drawer has the following attributes:
򐂰 A 4U (EIA units) rack-mount enclosure (#7314) holding one or two #5796 drawers
򐂰 Six PCI-X DDR slots: 64-bit, 3.3 V, 266 MHz (blind-swap)
򐂰 Redundant hot-swappable power and cooling units
1.6.2 12X I/O Drawer PCIe (#5802 and #5877)
The #5802 and #5877 expansion units are 19-inch, rack-mountable, I/O expansion drawers
that are designed to be attached to the system using 12X double data rate (DDR) cables. The
expansion units can accommodate 10 generation 3 cassettes. These cassettes can be
installed and removed without removing the drawer from the rack.
A maximum of two #5802 drawers can be placed on the same 12X loop. Feature #5877 is the
same as #5802, except it does not support disk bays. Feature #5877 can be on the same
loop as #5802. Feature #5877 cannot be upgraded to #5802.
The I/O drawer has the following attributes:
򐂰 Eighteen SAS hot-swap SFF disk bays (only #5802)
򐂰 Ten PCI Express (PCIe) based I/O adapter slots (blind-swap)
򐂰 Redundant hot-swappable power and cooling units
1.6.3 EXP 12S SAS Drawer
The EXP 12S SAS drawer (#5886) is a 2 EIA drawer and mounts in a 19-inch rack. The
drawer can hold either SAS disk drives or SSD. The EXP 12S SAS drawer has twelve
3.5-inch SAS disk bays with redundant data paths to each bay. The SAS disk drives or SSDs
contained in the EXP 12S are controlled by one or two PCIe or PCI-X SAS adapters
connected to the EXP 12S via SAS cables.
1.6.4 EXP 24S SFF Gen2-bay Drawer
The EXP24S SFF Gen2-bay Drawer is an expansion drawer supporting up to twenty-four
2.5-inch hot-swap SFF SAS HDDs on POWER6 or POWER7 servers in 2U of 19-inch rack
space. The EXP24S bays are controlled by SAS adapters/controllers attached to the I/O
drawer by SAS X or Y cables.
The SFF bays of the EXP24S are different from the SFF bays of the POWER7 system units
or 12X PCIe I/O drawers (#5802 and #5803). The EXP24S uses Gen2 or SFF-2 SAS drives
that physically do not fit in the Gen1 or SFF-1 bays of the POWER7 system unit or 12X PCIe
I/O Drawers, or vice versa.
1.6.5 I/O drawers and usable PCI slot
The I/O drawer model types can be intermixed on a single server within the appropriate I/O
loop. Depending on the system configuration, the maximum number of I/O drawers that is
supported differs.
Note: Mixing #5802 or 5877 and #5796 on the same loop is not supported.