BIOS BR256, User Manual, Page: 39 / 110

BR256
（
eSATA+USB3.0
）
model User Manual
－
38
－
●
Cache Management Setup
DPO/FUA BIT
DISABLE
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 detection of slow drive after first drive initialization completion.
「
0.1S
」
,
「
0.5S
」
are for testing.
This function does not work when the parameter is set to
「
NONE
」
or status under
「
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. Refer to Sec. 4.9.3 MOST DELAY CH.
●
Power On Standby Time Setup
WAIT POWER ON
TIME 10S
1S/5S/10S/15S/20S
Sometimes drives are not accessible after getting power connected. For this period specified, the RAID
controller will respond to host as drives not accessible.
(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.