On Feb 19, 2:15pm, "Kenneth D. Merry" wrote:
} Subject: Re: Slow seq. write on Seagate ST36530N
}
} The Write Cache Enable (WCE) bit is in mode page 8. To check it:
}
} camcontrol modepage -n da -u 1 -v -m 8
}
} To edit the mode page:
}
} camcontrol modepage -n da -u 1 -v -m 8 -
Dennis Glatting wrote...
>
> > > On the ST410800W I am getting, according to iozone:
> >
> > FWIW, several people have reported bad performance with that
> > drive when tagged queueing is enabled. Their firmware
> > revisions, however, were 71xx, not 45xx. Apparantly drives
> > with firmware tha
Matthew Jacob wrote...
> > >
> > > It sounds like a good idea, and it is. What I want to see is scsi_da use
> > > this automatically. I have never liked the "punch it, Chewey!" approach
> > > CAM has been taking.
> >
> > What do you mean "scsi_da use this automatically"?
> >
> > All of the t
> >
> > It sounds like a good idea, and it is. What I want to see is scsi_da use
> > this automatically. I have never liked the "punch it, Chewey!" approach
> > CAM has been taking.
>
> What do you mean "scsi_da use this automatically"?
>
> All of the tagged queueing stuff is controlled in t
Dennis Glatting wrote...
>
> > > Just to throw my voice in, I get crappy SCSI performance on my
> > > three SCSI card Dell. I don't understand why.
> >
> > Umm, you're going to have to be a little more specific than that.
> >
> > You do have one of those slow Western Digital drives, which
> > coul
Matthew Jacob wrote...
> > On Saturday, 20 February 1999 at 17:21:19 -0700, Kenneth D. Merry wrote:
> > > Matthew Jacob wrote...
> > >>
> > >> If you're feeling kind, could you try and see if you could get a
> > >> performance curve related to the number of outstanding tags allowed?
> > >
> > > I w
> On Saturday, 20 February 1999 at 17:21:19 -0700, Kenneth D. Merry wrote:
> > Matthew Jacob wrote...
> >>
> >> If you're feeling kind, could you try and see if you could get a
> >> performance curve related to the number of outstanding tags allowed?
> >
> > I will send him some diffs for camcontro
Greg Lehey wrote...
> On Saturday, 20 February 1999 at 17:21:19 -0700, Kenneth D. Merry wrote:
> > Matthew Jacob wrote...
> >>
> >> If you're feeling kind, could you try and see if you could get a
> >> performance curve related to the number of outstanding tags allowed?
> >
> > I will send him some
On Saturday, 20 February 1999 at 17:21:19 -0700, Kenneth D. Merry wrote:
> Matthew Jacob wrote...
>>
>> If you're feeling kind, could you try and see if you could get a
>> performance curve related to the number of outstanding tags allowed?
>
> I will send him some diffs for camcontrol in a separat
Dennis Glatting wrote...
>
> Just to throw my voice in, I get crappy SCSI performance on my
> three SCSI card Dell. I don't understand why.
Umm, you're going to have to be a little more specific than that.
You do have one of those slow Western Digital drives, which could cause
some problems.
>
Matthew Jacob wrote...
>
> If you're feeling kind, could you try and see if you could get a
> performance curve related to the number of outstanding tags allowed?
I will send him some diffs for camcontrol in a separate piece of mail that
will enable him to change the number of tags on the fly.
If you're feeling kind, could you try and see if you could get a
performance curve related to the number of outstanding tags allowed?
On Sun, 21 Feb 1999, Paul van der Zwan wrote:
> > >
> > > This did not improve anything , but I think I have found the couse.
> > > In that modepage there is a
> >
> > This did not improve anything , but I think I have found the couse.
> > In that modepage there is a DISC value which was 0 on the IBM and 1 on the
> > Seagate. I remembered a ' Enable disconnect' option in the Adaptec 2940
> > bios,
> > setting this to 'off' for both harddisks led to a
Matthew Jacob wrote...
>
>
> Well, yes, it can if the number of tagged commands you throw at a device
> overloads the sequencer so it can never really get started on the first
> command. If you don't disconnect, you don't throw multiple commands at
> the disk. I don't remember from the original m
Paul van der Zwan wrote...
> > Paul van der Zwan wrote...
> > >
> > > I am having some performance problems on my -current ( update last
> > > weekend)
> > > I hooked up a new Seagate ST36530N yesterday ( connected to an Adaptec
> > > 2940U)
> > Andreas Klemm has had similar trouble, as he point
Well, yes, it can if the number of tagged commands you throw at a device
overloads the sequencer so it can never really get started on the first
command. If you don't disconnect, you don't throw multiple commands at
the disk. I don't remember from the original mail whether or not this was
a raw d
:This did not improve anything , but I think I have found the couse.
:In that modepage there is a DISC value which was 0 on the IBM and 1 on the
:Seagate. I remembered a ' Enable disconnect' option in the Adaptec 2940 bios,
:setting this to 'off' for both harddisks led to a huge performance incre
> Paul van der Zwan wrote...
> >
> > I am having some performance problems on my -current ( update last weekend)
> > I hooked up a new Seagate ST36530N yesterday ( connected to an Adaptec
> > 2940U)
> Andreas Klemm has had similar trouble, as he pointed out.
> Can you check and see whether or not
Paul van der Zwan wrote...
>
> I am having some performance problems on my -current ( update last weekend)
> I hooked up a new Seagate ST36530N yesterday ( connected to an Adaptec 2940U)
> and sequential write is very slow.
> Compared to an IBM DORS-32160 connected to the same controller ( even th
Sounds familiar to me.
I had trouble with a Seagate Wide scsi harddisk in a HP Kajak.
First thought it's the NCR. Repllaces it with a AHA 2940UW.
Nothing helps. Installed FreeBSD 2.2.7.
With 2.2.7 the disk maxed at about 12 MB/sec write and write.
When I enabled tagged command queuing in 2.2.7, th
I am having some performance problems on my -current ( update last weekend)
I hooked up a new Seagate ST36530N yesterday ( connected to an Adaptec 2940U)
and sequential write is very slow.
Compared to an IBM DORS-32160 connected to the same controller ( even the same
cable) it is half as fast.
Io
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