Notes:
1. Important: DS4000 EXP700s are not supported by the DS4800 unless they
have been upgraded (with the DS4000 EXP700 Models 1RU/1RX
Switched-ESM Option Upgrade Kit) to have the same internal switched
capabilities as the DS4000 EXP710.
2. The DS4800 does not support the attachment of storage expansion enclosures
operating at 1 Gbps, such as the EXP500.
Intermixing storage expansion enclosures in the same drive loop
You can intermix EXP810s, EXP710s, and EXP100s. When intermixing EXP810s
with EXP710s or EXP100s in the same drive loop, the Link Rate switch for all
storage expansion enclosures in the intermixed drive loop must be 2 Gbps because
the EXP710 and EXP100 only operate at 2 Gbps.
There are maximum limits to the number of fibre channel hard drives that you can
configure in redundant drive channel pairs. The maximum number of drives dictates
a fixed number of supported EXP710 or EXP100 and EXP810 drive enclosure
combinations.
Table 5 lists the numbers of 14-drive and 16-drive storage expansion enclosures
you can combine for use in a single redundant drive channel/loop pair in a DS4800
configuration. Table 5 shows the supported storage expansion enclosures
combinations per redundant drive channel/loop pair in a DS4800 configuration. The
table assumes that a DS4800 storage subsystem is generally capable of addressing
the maximum of 112 fibre channel hard drives for each redundant drive
channel/loop pair.
Table 5. Possible combinations of 14-drive and 16-drive storage expansion enclosures per
redundant drive/channel loop pair in a DS4800 configuration
Number of
EXP810s
(16
drives/unit)
Total
number of
drives in
EXP810s
Number of
EXP710/
EXP100s
(14
drives/unit)
Total
number of
drives in
EXP710/
EXP100s
Total
number of
drives in
the DS4800
Total number
of drives in a
mixed
EXP710s and
EXP810s drive
loop
0 0 7 98 16 = 114
1 16 5 70 16 = 102
2 32 4 56 16 = 104
3 48 3 42 16 = 106
4 64 2 28 16 = 108
5 80 1 14 16 = 110
6 96 0 0 16 = 112
For more information about intermixing storage expansion enclosures and the most
current information on the DS4000 Fibre Channel and Serial ATA (FC/SATA)
Enclosure Intermix premium feature, see the following Web site:
www-1.ibm.com/support/docview.wss?rs=1100&uid=psg1MIGR-57823
Controllers
The DS4800 has two RAID controllers. Both controllers are identical and
interchangeable. The controllers install from the rear of the storage subsystem. The
10 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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