28 IBM Midrange System Storage Hardware Guide
Further information can be found at the following address:
http://www-03.ibm.com/servers/storage/disk/ds4000/exp810/
Figure 3-4 EXP810 front view
3.3.3 Intermixing EXP810 and EXP710
When intermixing the EXP810 and EXP710, even though the enclosure grouping by type is
not a requirement, IBM recommends that you group them by enclosure type in a redundant
drive channel pair to simplify maintenance and troubleshooting. Also, the EXP810 link rate
switch must be set at 2 Gbps if you use them in the same dive channel.
There is a limit for the number of maximum configurable disks in redundant drive channel
pairs. This limit determines the fixed number of drive enclosure combinations (Table 3-1). The
total number of configurable drives is 112.
Table 3-1 Total number of attached expansion units
IBM does not recommend the intermixing of expansion units in the same redundant drive
channel pair. IBM recommends connecting all of the EXP710s to a redundant drive channel
pair and all of the EXP810s to the other (second) redundant drive channel pair. In this case,
you can operate the EXP810 at a higher speed and avoid the subsequent separation of
intermixed drive channel pairs.
For detailed instructions for any intermix configuration, see the IBM System Storage
DS4000/DS5000 Hard Drive and Storage Expansion Enclosure Installation and Migration
Guide, GC53-1139.
IBM System Storage DS4000 and Storage Manager V10.30, SG24-7010 also has information
about intermixing different expansion enclosures behind the DS4000 storage systems.
Note: There is also an EXP810 model designed to be powered from a - 48 V dc Telco
industry standard power source and it is NEBS-3 compliant. It includes an air filter option
with the optional front bezel.
Enclosure Maximum number of configurable expansion units in
a drive channel pair
EXP710 8
EXP810 7
Intermixed 7
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