Performance Tuning In Small-Scale Configurations - Hitachi AMS 2100 Hardware Manual

Backing up your data
The AMS 2100/2300 supports two types of backup operations:
• Local backup - copying LUNs to another drive in the same array.
• Remote Backup - copying LUNs to a drive in another array.
Both of these operations are easy to accomplish using the wizards in
Navigator 2. You can also copy data using the True Copy and Snapshot
features in Navigator 2. See the Navigator 2 online help and the True Copy
and Snapshot manuals that are included in the AMS 2100/2300
documentation set for details.

Performance tuning in small-scale configurations

This section provides information to improve the I/O response time in small-
scale AMS 2100/2300 configurations.
The number of RAID Groups can be expanded in the AMS 2100/2300 array.
To realize this scalability, the system is designed to keep the throughput on
average even when the I/O is high. However, the I/O response time may
delay in the configuration that the number of RAID Groups is small, for
example, one to three.
In this case, the I/O response time can be improved by setting this option.
However, when continuously writing data to the cache, the amount of data
can greatly exceed the cache memory size. This can temporarily cause the
the throughput to deteriorate. Therefore, be careful when setting this
option. Hitachi Data Systems recommends that you consider the traffic in
the network environment before setting this option.
Setting the performance tuning option
1. In Navigator 2, display the Array List window and then select an array.
The Array Properties window and the explorer tree are displayed. If
needed, see
19.
2. In the explorer tree, expand the Performance menu and select Tuning
Parameter. The Tuning Parameter window is displayed.
3. Expand the Tuning Parameter menu to show the three options. These
are described in
Item
Multi-Stream
System Tuning
LU Ownership
First time storage configuration - required tasks on page 7-
Table 7-14.
Table 7-14: Tuning Parameters
Multi-Stream is a function that sets some parameters for multi-
streaming for selected systems or logical units
System Tuning is a function that sets some parameters for all
systems.
Logical Unit Ownership is a function that sets some parameters to
logical unit ownership.
Configuration
Hitachi AMS 2100/2300 Storage System Hardware Guide
Description
7–43