Re: [PATCH] SCSI midlayer power management

James Bottomley
2004-08-11T16:28:39Z

On Wed, 2004-08-11 at 10:21, Alan Cox wrote:
> In addition we are not doing SCSI target so multi-initiator is ok.
> One question James - what are the rules for power management with
> SCSI when we provide termpwr to a shared bus ?

I don't believe the spec addresses that.

The rules we use in HA are that each bus entity supplies termpwr (i.e.
all initiators and targets) and each terminator draws its power from the
bus). Thus the bus is properly terminated until the last device powers
down.

You have to jumper this specially on most SCSI cards (especially if
they're at the end of the bus and have internal termination).

James