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Note: Since the maximum number of drives that can be supported in the DS4500
redundant drive loop pair is 112, IBM does not support the use of partially
filled drive enclosures when intermixing storage expansion enclosures of
different drive slot capacities to prevent the possibility of going over the
maximum of 112 drives in a drive loop. Intermixing drive expansion
enclosures with different number of drive slots will reduce the maximum
number of drives that can be configured in a redundant drive loop pair, as
shown in Table 15 on page 65.
Table 14. Support for new storage expansion enclosures within a DS4500 drive loop
Existing EXP
drive
expansion
enclosure in
drive loop
New EXP drive expansion enclosure
EXP500 EXP100 EXP700 EXP710
EXP810 (FC
or SATA)
EXP500 Yes No
1
Yes
2
No
1
No
1
EXP100 No
1
Yes
3
Yes
3, 6
Yes
3, 4, 6
Yes
5, 6, 8
EXP700 Yes
2
Yes
3, 6
Yes Yes
4
No
7
EXP710 No
1
Yes
3, 4, 6
Yes
4
Yes
4
Yes
5, 6, 8
EXP810 (FC
or SATA)
No
1
Yes
5, 6, 8
No
7
Yes
5, 6, 8
Yes
5, 6, 8
1
EXP500 operates at 1 Gbps FC speed only. EXP100 and EXP710 operate at 2 Gbps FC
speed only. EXP810 operates at 2 Gbps and 4 Gbps FC speed.
2
Requires DS4500 controller firmware version 5.40.xx.xx. The drive mini hubs and EXP710
speed switch must be set to 1 Gbps.
3
EXP100 requires DS4500 controller firmware version 5.41.xx.xx or higher. Controller
firmware version 6.12.xx.xx is required for intermixing EXP100 and EXP700/EXP710
storage enclosures behind a DS4500 Storage Subsystem. It is recommended that you use
the latest general released firmware version 6.19.xx.xx if there are not any EXP700
enclosures in the DS4500 configuration.
4
EXP710 requires DS4500 controller firmware version 6.1x.xx.xx or higher. The drive mini
hubs and EXP710 speed switch must be set to 2 Gbps. It is recommended that you use the
latest general released firmware version 6.19.xx.xx if there are not any EXP700 enclosures
in the DS4500 configuration.
5
EXP810 requires DS4500 controller firmware version 6.19.xx.xx or higher.
6
FC/SATA intermix premium feature is required if there is a mix of FC and SATA drives in
the DS4500 Storage Subsystem.
7
EXP700 requires the purchase of the DS4000 EXP700 Models 1RU/1RX Switched-ESM
Option Upgrade Kit if it is to be attached to EXP810s.
8
EXP810 speed switch must be set to 2 Gbps.
64 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide