Specifications

Overview of the IBM TotalStorage Enterprise Storage Server (ESS)
The ESS is a part of the Seascape
®
family of storage servers. The ESS provides
integrated caching and support for redundant arrays of independent disks (RAID)
for the disk drive modules (DDMs). The DDMs are attached through a serial storage
architecture (SSA) interface.
The minimum configuration for all ESS models is 16 DDMs. ESS Models E10 and
F10 support a maximum of 64 DDMs. ESS Models E20 and F20 support a
maximum of 384 DDMs, with 128 DDMs in the base enclosure and 256 DDMs in
the expansion enclosure.
Figure 1 and Figure 2 on page 3 show the ESS base enclosure and the expansion
enclosure. ESS Models E10 and F10 do not support an expansion enclosure.
Both the ESS base enclosure and the expansion enclosure have dual power cables
and redundant power. The redundant power system enables the ESS to continue
normal operation when one of the power cables is inactive. Redundancy also
ensures continuous data availability.
Front view
Rear view
Figure 1. ESS Models E10, E20, F10, and F20 base enclosure; front and rear views
2 ESS Host Systems Attachment Guide