Date: Mon, 11 Aug 2003 13:49:46 -0400 From: Don Bowman <don@sandvine.com> To: "'Kenneth D. Merry'" <ken@kdm.org>, Don Bowman <don@sandvine.com> Cc: "'aic7xxx@freebsd.org'" <aic7xxx@freebsd.org> Subject: RE: Ongoing U320 AIC7902 Seagate ST318453LW issues, SCB timed out Message-ID: <FE045D4D9F7AED4CBFF1B3B813C853370274221F@mail.sandvine.com>
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> From: Kenneth D. Merry [mailto:ken@kdm.org] > > On Fri, Aug 08, 2003 at 13:43:55 -0400, Don Bowman wrote: > > Just to confirm i'm talking about the same thing... > > my seagate device reports 255 tagged openings: > > > > # camcontrol tags 0:0:0 > > (pass0:ahd0:0:0:0): device openings: 255 > > > > but seagate indicates the device has only support for > > 64. Am i reading something different here? > > You'll see 255 openings until we get a queue full response > from the drive. > Then it'll go down to however many transactions we had > outstanding when the > queue full happened. > > If you want a little more information (e.g. how many transactions are > outstanding at a given moment), try: > > camcontrol tags da0 -v > > Ken So i've reconfirmed, the drive supports a max of 64 tags. under load I see the max go down to 252, how can that make sense? under severe load it may go lower, to e.g. 33. ???
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