Specifications

Chapter 1. General description 23
The Power 770 and Power 780 support both 2.5-inch and 3.5-inch SAS SFF hard disks. The
3.5-inch DASD hard disk can be attached to the Power 770 and Power 780 but must be
located in a feature #5886 EXP12S I/O drawer, whereas 2.5-inch DASD hard files can be
either mounted internally or in the EXP24S SFF Gen2-bay Drawer (#5887).
If you need more disks than available with the internal disk bays, you can attach additional
external disk subsystems. For more detailed information about the available external disk
subsystems, see 2.11, “External disk subsystems” on page 92.
SCSI disks are not supported in the Power 770 and 780 disk bays. However, if you want to
use SCSI disks, you can attach existing SCSI disk subsystems.
The disk/media backplane feature #5652 provides six SFF disk slots and one SATA media
slot. In a full configuration with four connected building blocks, the combined system supports
up to four media devices with Media Enclosure and Backplane #5652. The SATA Slimline
DVD-RAM drive (#5762) is the only supported media device option.
1.6 I/O drawers
The system has eight I/O expansion slots per enclosure, including two dedicated GX++ slots.
If more PCI slots are needed, such as to extend the number of LPARs, up to 32 PCI-DDR
12X Expansion Drawers (#5796) and up to 16 12X I/O Drawer PCIe (#5802 and #5877) can
be attached.
The Power 770 and the Power 780 servers support the following 12X attached I/O drawers,
providing extensive capability to expand the overall server expandability and connectivity:
򐂰 Feature #5802 provides PCIe slots and SFF SAS disk slots.
򐂰 Feature #5877 provides PCIe slots.
򐂰 Feature #5796 provides PCI-X slots.
򐂰 The 7314-G30 drawer provides PCI-X slots (supported, but no longer orderable).
Disk-only I/O drawers are also supported, providing large storage capacity and multiple
partition support:
򐂰 Feature #5886 EXP 12S holds a 3.5-inch SAS disk or SSD.
򐂰 Feature #5887 EXP 24S SFF Gen2-bay Drawer for high-density storage holds SAS Hard
Disk drives.
򐂰 The 7031-D24 holds a 3.5-inch SCSI disk (supported but no longer orderable).
򐂰 The 7031-T24 holds a 3.5-inch SCSI disk (supported but no longer orderable).
1.6.1 PCI-DDR 12X Expansion Drawers (#5796)
The PCI-DDR 12X Expansion Drawer (#5796) is a 4U tall (EIA units) drawer and mounts in a
19-inch rack. Feature #5796 takes up half the width of the 4U (EIA units) rack space. Feature
#5796 requires the use of a #7314 drawer mounting enclosure. The 4U vertical enclosure can
hold up to two #5796 drawers mounted side by side in the enclosure. A maximum of four
#5796 drawers can be placed on the same 12X loop.