IBM Power 750 Express Hardware Announcement page 13

12X I/O Drawer PCIe, No disk (#5877)
This feature provides a 4U high 19-inch I/O drawer containing 10 PCIe 8x I/O
adapter slots.
A maximum of two feature 5877 drawers can be placed on the same 12X loop.
Mixing features 5877 and 5796/7314-G30 on the same loop is not supported. Mixing
features 5802 and 5877 on the same loop is supported with a maximum of two
drawers total per loop. The PCIe adapter slots use Gen 3 blind-swap cassettes and
support hot plugging of adapter cards. A minimum configuration of two 12X DDR
cables and two ac power cables and two SPCN cables is required to ensure proper
redundancy. 12X SDR cables are not supported. The drawer attaches to the host
CEC enclosure with a 12X adapter in a GX slot via 12X DDR cables (#1861/#1862/
#1864/#1865).
The Power 750 uses GX Dual-port 12X Channel Attach (#5609) or GX Dual-port 12X
Channel Attach (#5616) to attach a feature 5877 12X I/O Drawer. Feature 5609
provides the higher capacity bandwidth (DDR).
Note that conversions between a diskless feature 5877 and a feature 5802 with disk
bays are not available.
EXP 12S SAS Drawer (#5886)
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 drawer
supports redundant hot-plug power and cooling and redundant hot-swap SAS
expanders (Enclosure Services Manager-ESM). Each ESM has an independent SCSI
Enclosure Services (SES) diagnostic processor.
The SAS disk drives or SSD contained in the EXP12S are controlled by one or two
PCIe or PCI-X SAS adapters connected to the EXP12S via SAS cables. The SAS cable
will vary, depending upon the adapter being used, the operating system being used,
and the protection desired.
• The large cache PCI-X feature 5904/5908 uses a SAS Y cable when a single port
is running the EXP12S. A SAS X cable is used when a pair of adapters are used for
controller redundancy.
• The medium cache PCI-X feature 5902 and PCIe feature 5903 adapters are always
paired and use a SAS X cable to attach the feature 5886 I/O drawer.
• The zero cache PCI-X feature 5912 and PCIe feature 5901 use a SAS Y cable
when a single port is running the EXP12S. A SAS X cable is used for AIX/Linux
environments when a pair of adapters are used for controller redundancy.
In all of the above configurations, all 12 SAS bays are controlled by a single
controller or a single pair of controllers.
A second EXP12S drawer can be attached to another drawer using two SAS EE
cables, providing 24 SAS bays instead of 12 bays for the same SAS controller port.
This is called cascading. In this configuration, all 24 SAS bays are controlled by a
single controller or a single pair of controllers.
The feature 5886 can also be directly attached to the SAS port on the rear of the
Power 750, providing a very low cost disk storage solution. When used this way,
the imbedded SAS controllers augmented by the 175 MB write cache RAID enabler
feature 5679 in the system unit drive the disk drives in EXP12S. A second unit
cannot be cascaded to a feature 5886 attached in this way.
19-inch racks
The Model 8233-E8B and its I/O drawers are designed to mount in the 25U 7014-
S25 (#0555), 36U 7014-T00 (#0551), or the 42U 7014-T42 (#0553) rack. These
racks are built to the 19-inch EIA standard. When you order a new 8233 system,
you can also order the appropriate 7014 rack model with the system hardware on
IBM United States Hardware Announcement
110-009
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