ABCs of z/OS System Programming Volume 3 - IBM Redbooks

8.6 ESS major components
Figure 8-6 ESS major components
ESS Model 800 major components
Figure 8-6 shows an IBM TotalStorage Enterprise Storage Server Model 800 and its major
components. As you can see, the ESS base rack consists of two clusters, each with its own
power supplies, batteries, SSA device adapters, processors, cache and NVS, CD drive, hard
disk, floppy disk, and network connections. Both clusters have access to any host adapter
card, even though they are physically spread across the clusters.
At the top of each cluster is an ESS cage. Each cage provides slots for up to 64 disk drives,
32 in front and 32 at the back.
This storage box has two enclosures:
► A base enclosure, with:
– Two 3-phase power supplies
– Up to 128 disk drives in two cages
– Feature #2110 for Expansion Enclosure attachment
– Host adapters, cluster processors, cache and NVS, and SSA device adapters
► An expansion enclosure, with:
– Two 3-phase power supplies
– Up to 256 disk drives in four cages for additional capacity
456 ABCs of z/OS System Programming Volume 3
Cages and disk drives
SMP Processors and
Cache
SSA Device Adapters
Host Adapters
Main Power
Supplies
Batteries