BIOS BR256, User Manual, Page: 38 / 110

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Buffer Segment Size Setup
BUFFER SEGMENT
SIZE 64KB/CH
8KB/CH,16KB/CH,32KB/CH,64KB/CH
Setup buffer segment size per drive channel. This is the size of data block for one command. For large
sequential data access, the bigger size can give better performance. On the contrast, for random access, the
smaller size can give better performance.
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Wait Time of Retry Setup
RETRY MAXIMUM
TIME 5S
25S/10S/5S/1S/0.1S
Setup the interval between drive time out and retry.
（「
1S
」
,
「
0.1S
」
is only for testing
）
The actual processing time will take 2 or 3 times of the setting. OS might need to setup a longer time out
interval because of the longer retry processing on storage system.
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Sequential List Size Setup
SEQUENTIAL LIST
SIZE 8
8/16/32/64
This is to setup a table size of judging the access pattern as Sequential or Random. It depends on also
simultaneous number of streams and size of cache memory.
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Sequential Read Ahead Multiplier Setup
SEQUENTIAL READ
AHEAD 8 TIMES
2 TIMES/4 TIMES/8 TIMES/16 TIMES/32
TIMES
Either use a fixed size or this multiplier times access size as the data size of sequential read ahead. Larger
size will be chosen. Cache memory will be quickly consumed if the large size is setup. Usually, the size
should be set up small when host power is low or vice versa.