RE: iSCSI: Re: iSCSI & Linked Commands

["Douglas Otis" <dotis@sanlight.net>]

Stephen,

Unlike random access devices, sequential access devices operate with
relative addressing.  For random access devices, this is a seldom used
option.  There is a requirement to bind commands together to ensure order of
execution on these devices.  By popular, you mean not sequential?

Doug


> Julian,
>
> > According to your logic no FCP implementation can use linked commands?
> > Is this true for all OS's?  Is it a verified fact or foloklor?
>
> In my experience it's fact.  I have never used a SCSI stack which both
> supported AND used linked commands.  Like some others here, I always
> assumed AIX might :^) Ralph has pointed out that T10 is well aware
> that the feature is not popular.  There are other ways of
> accomplishing the same thing that are less likely to blow up in your
> face.
>
> > Is it so also for the new MS StorPort driver?
>
> I don't know, but I'd be really surprised if they did use linked
> commands.  You have to be pretty nuts to rely on a feature that's not
> even exercised by most SCSI implementations.
>
> Steph
>