System Memory

The system memory is a memory module that has the following two types of area.

  • Cache area, which stores frequently used data

  • System area, which stores data for speeding up controller processing

The following table shows the maximum system memory capacity for each controller.

Table: Maximum System Memory Capacity for Each Controller

Model

System memory capacity (max.) (per CM)

ETERNUS DX600 S6

1,024GB

ETERNUS DX900 S6

1,024GB

ETERNUS DX8900 S6

2,048GB
Caution

A system memory of 1,024GB/CE and 2,048GB/CE includes the area for supporting the Compression function.

The maximum capacity that can be used as the SAN cache is 768GB per controller (1,536GB per controller enclosure).

Table: SAN Cache Capacity When the Compression Function Is Being Used

System memory

System memory capacity

(for each controller)

SAN cache capacity (for each controller)

Compression disabled

Compression enabled

1,024GB

512GB

512GB

256GB

2,048GB

1,024GB

1,024GB

768GB

If the ETERNUS DX is equipped with two controllers and the system memory fails, it can be replaced while the system is running.

For details on the types and number of system memory and policies for estimating system memory, refer to System Memory.