[8477] in linux-scsi channel archive
inducing SCSI bus scan
daemon@ATHENA.MIT.EDU (mkwasigr@INTERCOPE.COM)
Fri Mar 24 05:47:22 2000
From: mkwasigr@INTERCOPE.COM
To: linux-scsi@vger.rutgers.edu
Cc: eric@andante.org
Message-ID: <C12568AC.003ABFC2.00@NS.INTERCOPE.COM>
Date: Fri, 24 Mar 2000 11:43:19 +0100
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Hi all,
issuing an
echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
works fine but you'll lose any tagged command queueing (TCQ) depths > 1.
They'll be reset to one with (I'm sure) some performance penalty for the
devices supporting it. This is why I don't use it anymore, my IBM scsi
disks appear to be faster with a queue depth of eight.
-> I could not find the reason for this by looking at the source code, but
I must admit I didn't tried too hard...
-> Maybe one day this useful command will be out of BETA and no longer have
this side effect on the TCQ queue depth.
Thanks.
Mit freundlichen Gruessen / best regards
Michael Kwasigroch
FaxPlus/Open Development
________________________________________
eMail: mkwasigr@intercope.com
INTERCOPE GmbH, Hamburg, Bebelallee 72
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