Controllers; Table 84 Maximum System Memory Capacity For Each Controller - Fujitsu ETERNUS DX S5 Series Design Manual

6. Hardware Configurations
Controller Enclosure

Controllers

The controller contains a CPU, system memory, Bootup and Utility Device (BUD), host interfaces, and drive
interface ports. The controller controls all operations in the ETERNUS DX.
The device has one or two controllers.
When the device has one controller, another controller can be added during system operation. If one of the
controllers fails in an ETERNUS DX with two controllers, the failed controller can be replaced while the system is
running.
IMPORTANT
• The single-controller type differs from the dual-controller type by the following features:
- The controller and I/O module are not duplicated.
- Hot maintenance or swapping of the controller and I/O module is not possible.
- Concurrent firmware loading or update of the controller firmware and I/O module firmware is not
possible.
- Multipath connection to a single server is not available.
- The Thin Provisioning function cannot be used.
- The Flexible Tier function cannot be used.
- The Deduplication/Compression function cannot be used.
- Unified (NAS connection) is not available.
- High-density drive enclosures cannot be installed.
• Fujitsu recommends that the dual-controller types, in which the controller and I/O module are
duplicated, be used in a system where a high level of reliability is required.
■
CPU
Each controller has one CPU.
■
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 84 Maximum System Memory Capacity for Each Controller
Model
ETERNUS DX60 S5
ETERNUS DX100 S5
ETERNUS DX200 S5
ETERNUS DX500 S5
ETERNUS DX600 S5
ETERNUS DX900 S5
If the ETERNUS DX is equipped with two controllers and the system memory fails, it can be replaced while the
system is running.
System memory capacity (max.) (per CM)
8GB
32GB
64GB
256GB
384GB
768GB
257 Design Guide