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Table 3. IBM Enterprise Storage Server physical features (continued)
Feature
Service
Customer interface
DDMs (See Note 2.)
Support of 8-packs
Expansion enclosure
Notes:
1. The ESS requires two spares per SSA loop with RAID. For enhanced availability, IBM recommends that you
install the IBM Subsystem Device Driver on your open host system.
2. DDM configuration:
a. DDMs are either all 9.1 GB, all 18.2 GB, or all 36.4 GB.
b. DDM capacity assumes a RAID-5 configuration.
Logical subsystems
IBM configures the ESS as logical containers that are known as logical subsystems
(LSSs). The limit is 16 LSSs each for count-key-data (CKD) and fixed block (FB)
format.
Note: If you reduce the CKD LSS limit to zero, then no Peer-to-peer copy functions
IBM advises that you consider reducing the maximum LSSs limit (to eight or zero) if
you do not intend to create more than eight LSSs. Also reduce the maximum LSS
limit if you plan to create only CKD or FB data on your ESS. Reducing the
maximum LSS limit reduces the cache space that the ESS uses to maintain the
LSS structures (performance tuning).
Note: If you increase or decrease the LSS at a future date, you will need to
will execute. CKD LSS limit must be no lower then eight to support
peer-to-peer copy functions for Open only machines.
reinitialize the ESS in order for the change to take effect.
Description
v Mobile solutions terminal or equivalent
v Remote service
v Call home
v Concurrent maintenance
v Simple Network Management Protocol (SNMP)
v Storage server Ethernet attachment (10Base-T)
v Customer workstation
v Web interface
v 16 - 384 in increments of 8 (8-pack)
v Capacity
– 105 GB to 2.8 TB (9.1 GB DDMs)
– 210 GB to 5.6 TB (18.2 GB DDMs)
– 420 GB to 11.2 TB (36.4 GB DDMs)
v 36.4 GB (40 MBps)
v 18.2 GB (40 MBps)
v
9.1 GB (40 MBps)
Supported by Models E20 and F20
23
Chapter 1. Introduction
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