BIOS DVPro T10B3, Руководство пользователя, Страница: 25 / 65

DVT10B3
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22
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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
CHECK DRV DELAY
TIME 1S
NONE, 0.1S, 0.5S, 1S*, 5S
This setting decides how long to wait for the drive response.
「
0.1S
」
,
「
0.5S
」
are for testing
This function does not work when the system is under
「
NONE
」
or
「
ONE DOWN
」
or
「
SYSTEM DOWN
」
.
If there is a certain process, and it causes data retries within a certain disk or media, or the time needed
to write to another drive taking long, then entire performance is slow down.
（
Transfer speed will suffer.
）
In this sense, it is an early indication to warn for replacing slow drives.
The slow disk channel warning will be displayed on the LCD.
● Power On Standby Time Setup
WAIT POWER ON
TIME 10S
1S, 5S*, 10S, 15S, 20S
Sometimes drives are not immediately accessible to host after power on. For this period specified, the
RAID controller will return to host access with such not ready status.
(For example, “Not Ready” is
responded to “Test Unit Ready” command.)
● Drive Ready Wait Time Setup
HDD WAIT READY
TIME 1 MIN
1 MIN*, 3 MIN, 5 MIN
Set up time to wait for Drive getting Ready.
Usually the drive is judged as DOWN if it is not ready after certain period after power on but some high
speed and high capacity drive will need a longer period WAIT time to get ready.
● Cache Memory Check Timing Setup