![background image](http://html.mh-extra.com/html/ibm/totalstorage-ds5100/totalstorage-ds5100_installation-users-and-maintenance-manual_609021049.webp)
9. Add a new storage subsystem entry in the Enterprise Management window,
using the new assigned IP addresses.
Note:
To manage storage subsystems through a firewall, configure the firewall to
open port 2463 to TCP data.
Controller memory
Each RAID controller has data cache memory. The processor memory stores the
controller firmware, while the data cache is a buffer used to temporarily store hard
disk drive data during data read and write operations. A Cache Active LED on the
controller turns on when the cache contains data that has not been written to hard
disk drives. The Cache Active LED turns off when the cache does not contain
unwritten data.
Table 6 lists the technical specifications for the RAID controllers.
Table 6. RAID controller specifications
Category
Criteria
Specification
Memory
Cache size
Memory cache size varies based on
model:
v
DS5100 (Model 51A): 4 GB per
controller for a total of 8 GB
v
DS5300 (Model 53A): 8 GB per
controller for a total of 16 GB
Upgradeable to 32 GB per controller
for a total of 64 GB per storage
subsystem
Chapter 1. Introduction
17