Asus PCI-DA2200, User Manual

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ASUS PCI-DA2100/PCI-DA2200 User’s Manual
3.5 Drive-Side SCSI Parameters
3.5.1 SCSI Motor Spin-up
When the power supply is unable to provide sufficient current for all
the hard drives and controllers that are powered-up at the same time,
spinning-up the hard drives
serially is one of the best way of
consuming lower power-up current.
By default, all hard drives will spin-up when powered-on. These
hard drives can be configured so that all of them will not spin-up at
power-on. There are 3 methods of spinning-up the hard drive’s
motor: Spin-up at power-on, Spin-up serially in random sequence or
Spin-up by SCSI command. Please refer to the hard drive’s user’s
manual for instructions on configuring the hard drive using the
“Spin-up by SCSI command”. The procedure for each brand/model
of hard drive should vary.
Configure all the hard drives as above and enable “SCSI Motor Spin-
Up” in Drive-Side SCSI Parameters. Power off all hard drives and
controller, and power them on again. All the hard drives will not
spin-up at this time. The controller will then spin-up the hard drives
one by one at four seconds interval.
IMPORTANT:
If the drives are configured as “Delay Motor Spin-up” or “Motor Spin-up
in Random Sequence,” some of these drives may not be ready yet for the
controller to access when the system powers up. Increase the disk access
delay time so that the controller will wait a longer time for the drive to be
ready.
3.5.2 SCSI Reset at Power Up
By default, when the controller is powered up, it will send a SCSI bus
reset command to the SCSI bus. When disabled, it will not send a
SCSI bus reset command on the next power-up.
When connecting dual host computers to the same SCSI bus, the SCSI
bus reset will interrupt all the read/write requests that are being
performed. This may cause some operating systems or host
computers to act abnormally. Disable the “SCSI Reset at Power-up”
to avoid this situation.