Hitachi AMS 2100 Hardware Manual page 226

Viewing the Tuning Parameter Mode
You can view the current Simple Tuning mode from the Summary portion of
the Tuning Parameter window. There are two available modes, which may
be set using the Change Simple Tuning button:
• Normal
• Response Performance
1. To change the Simple Tuning mode, click Change Simple Tuning
(upper right corner of the window). The Change Simple Tuning window
is displayed. Select Response Performance to improve the I/O
response time only if the system meets the following conditions:
• Dirty data are at 50%
• The dirty data stop opportunity is 50%
• The Multi-stream mode of the system is Read/Write
2. Click OK.
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Configuration
Hitachi AMS 2100/2300 Storage System Hardware Guide