Re: Task Sets in SCSI and Linux

Kurt Garloff
2002-05-08T18:29:01Z

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Hi Michael,

On Wed, May 08, 2002 at 01:22:31PM -0400, Michael Heinz wrote:
> You confused me with this - my testing with 2.4 seems to indicate that
> SCSI won't queue up more than one command per LUN (that is, it waits for
> one command to complete before issuing the next). How can I tell it to
> do otherwise? (It allows parallel commands, as long as they are going to
> different LUNs). I didn't see anything in the SHT to indicate otherwise.

Your host adapter driver and your device need to support Tagged Command
Queueing and it needs to be enabled. The Linux SCSI layer will make use of
it.

Regards,
--
Kurt Garloff <kurt@garloff.de> [Eindhoven, NL]
Physics: Plasma simulations <K.Garloff@TUE.NL> [TU Eindhoven, NL]
Linux: SCSI, Security <garloff@suse.de> [SuSE Nuernberg, DE]
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