IBM Midrange System DS4000 Series Hardware Manual page 214

Midrange system storage ds4000/ds5000 series

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7. The Customize Advanced Logical Drive Parameters window opens (Figure 4-61). You can

set your new logical drive using any of the predefined I/O types listed, or manually set the

cache read ahead multiplier, segment size, and controller ownership.

a. For logical drive I/O characteristics, you can specify file system, database, or

multimedia defaults. The Custom option allows you to disable or enable the dynamic

cache read prefetch and the segment size. Table 4-9 shows the defaults predefined for

each I/O type.

Table 4-9 Logical drive defaults I/O characteristics

IBM Midrange System Storage Hardware Guide

Segment size

Modification priority

Write cache without

Write cache with

Flush write cache after

Dynamic cache

Enable background

Media scan with

redundancy check

Pre-read redundancy