BIOS AP DVPro DVT10T2, Руководство пользователя

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DVT10T2
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24
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Set up 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.
● 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.
● Sequential List Size Setup
SEQUENTIAL LIST
SIZE 8
8*, 16, 32, 64, 128
This is to setup the number of Sequential access stream. The system maintains a table of recording
Sequential streams. It depends on simultaneous number of sequential streams and size of cache
memory.
● Sequential Read Ahead Multiplier Setup
SEQUENTIAL READ
AHEAD 8 TIMES
2 TIMES, 4 TIMES, 8 TIMES*, 16 TIMES,
32 TIMES
One time data read size depends on the bigger value between READ Ahead Size parameter and access
size multiplies this Sequential Read Ahead TIMES. Cache memory will be quickly consumed if the large
size is setup. Usually, the size should be set up small when host performance is low or vice versa.
● Cache Control Setup
DPO/FUA BIT
ENABLE
ENABLE, DISABLE*
This is to Enable or Disable the cache control flag of SCSI standard.
DPO(Disable Page Out)
：
Depend on the execution of command, DPO allows to discard the data in
the cache by other commands.
FUA(Force Unit Access)
：
During command execution, it forces the drive access.
For details, please refer to SCSI-2 standard.
● Slow Drive Detection Time Setup