Stable Operation; Quality Of Service (Qos); Host Response; Figure 4.2 Host Response (Connection Operation Mode) - Fujitsu ETERNUS DX500 S3 Overview

Chapter 4 SAN Functions
4.2

Stable Operation

4.2 Stable Operation
This section explains a function that sets the operation mode according to the connection environment of
the ETERNUS DX in order to enable stable operation.
4.2.1

Quality of Service (QoS)

The I/O performance of a server with higher priority is guaranteed by configuring the performance limit of
each connected server.
When loads from one application are high in a storage integrated environment and sufficient resources to
process other operations cannot be secured, performance may be reduced.
If the QoS function is used, the processing performance of the server given priority for a process can be main-
tained. The workload limit can be configured on each server, and even if workload has been changed by a
server processing request, the prioritized operation will not be affected.
The storage resource can be automatically adjusted using ETERNUS SF Storage Cruiser to link the QoS auto-
mation with Automated Storage Tiering.
In addition, an upper bandwidth limit can be set for each copy path. Even if a specific path fails, a steady
load can be maintained without centralizing the load to other paths.
4.2.2

Host Response

The server requirements of the supported functions, LUN addressing, and the method for command respon-
ses vary depending on the connection environments such as the server OS and the driver that will be used.
Responses from the ETERNUS DX can be changed to the optimal one by specifying the appropriate operation
mode for the connection environments.

Figure 4.2 Host Response (Connection Operation Mode)

Server A
Host Response settings
for Server A for Server B for Server C
Server C
Server B
ETERNUS DX
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