IBM System Storage DS4000, Руководство по оборудованию

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Chapter 3. IBM System Storage DS4000 and DS5000 hardware
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In this section, we discuss the features of the DS4000 expansion units (EXP) and how they
can be attached and combined to expand the storage capacity of the DS4000 storage
servers. In particular, we look at the possibilities and limitations of intermixing FC and SATA
enclosures, as that is now supported with Storage Manager V9.x and later.
For additional information about drive migration and special handling procedures for
expansion enclosures, see the IBM System Storage DS4000/DS5000 Hard Drive and
Storage Expansion Enclosure Installation and Migration Guide, GC53-1139.
3.3.1 IBM Total Storage DS4000 EXP710 expansion enclosure
The EXP710 (Figure 3-3) is a rack-mountable storage expansion enclosure that contains 14
bays for slim-line hot-swappable Fibre Channel disk drives. It occupies 3U inside a rack and
features hot-pluggable and redundant power supplies and fans.
The redesigned Environmental Service Module board (two ESMs in an EXP710) provides a
redundant switched connection to each drive in EXP710, eliminating the arbitrated loop within
the disk enclosure that existed in the previous EXP700 model.
This feature allows not only better performance in a large configuration, resulting from
reduced loop latency, but also improves diagnostics and troubleshooting tasks. Indeed, the
point-to-point topology provides a full isolation of the drives, eliminating the risk of a single
drive disrupting the loop and causing other drives to fail on the loop (fault propagation). This
also enables selective diagnosis of FC errors.
For more information about DS4000 EXP710 Expansion Enclosure, go to the following
address:
https://www-947.ibm.com/systems/support/supportsite.wss/brandmain?brandind=5345868
Figure 3-3 EXP710 front view
3.3.2 IBM System Storage EXP810 expansion enclosure
The IBM System Storage EXP810 Storage Expansion Unit (1812-81A) expands the
sixth-generation architecture of the DS4000 series disk storage systems with increased,
built-in capability for 4 Gbps Fibre Channel operation and 16-bay disk capacity. The
Expansion Unit is rack-mountable, occupies 3U rack space, and comes standard with two
4 Gbps shortwave small form-factor pluggable fiber optic transceivers for connection to
selected DS4000 midrange disk systems. The EXP810 attaches to the DS4300, DS4500,
DS4700, DS4800, DS5100, and DS5300 storage subsystems.