Ongoing U320 AIC7902 Seagate ST318453LW issues, SCB timed out
don at sandvine.com
Mon Aug 11 10:49:51 PDT 2003
> From: Kenneth D. Merry [mailto:ken at 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
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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