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DDM cages and 8 packs
The Models E10 and F10 support one DDM cage. Models E20 and F20 support two
DDM cages.
Each DDM cage supports eight 8-packs (64 DDMs), four in the front, and four in the
rear. IBM will ship the appropriate number of cages, based on the number of
8-packs you order.
The feature numbers for ordering 8-packs in different DDM sizes for the ESS cages
are:
2121
2122
2123
IBM includes device cables for the 8-packs that IBM installs in the factory. You must
order device cables for the 8-packs that you have service personnel install in the
field.
Expansion enclosures
The expansion enclosures (feature code 2100) support one, two, three, or four
DDM cages.
Each DDM cage supports eight 8-packs (64 DDMs), four in the front, and four in the
rear.
Note: The Model E10 does not support the expansion enclosure.
Populating the IBM Enterprise Storage Server
You can build the maximum configuration for an ESS with the expansion
enclosures.
If you order the expansion enclosure from the factory, IBM populates the expansion
enclosure with 8-packs in the following order:
v Models E10 and F10
v Models E20 and F20
Physical configuration options
You can order the following physical configurations for your ESS:
v Ultra-high-performance configuration with arrays that include only 9.1-GB DDMs
v High-performance configuration with arrays that include only 18.2-GB DDMs
v Capacity configurations with arrays that include only 36.4-GB DDMs
Standard configuration provides:
v 6 GB of cache for Models E10 and E20
32
ESS Introduction and Planning
DDM 8-pack (9.1 GB)
DDM 8-pack (18.2 GB)
DDM 8-pack (36.4 GB)
– Cage 1, 8-packs 4, 3, 2, 1
– Cage 1, 8-packs 8, 7, 6, 5
– Cage 1, 8-packs 4, 3, 2, 1
– Cage 1, 8-packs 8, 7, 6, 5
– Cage 2, 8-packs 4, 3, 2, 1
– Cage 2, 8-packs 8, 7, 6, 5
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