From: Patrick Caulfield <caulfield@sistina.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] Re: [Announce] device-mapper beta3 (fast snapshots)
Date: Tue Jul 16 13:05:02 2002 [thread overview]
Message-ID: <20020716180522.GN957@tykepenguin.com> (raw)
In-Reply-To: <1026840444.21656.544.camel@tiny>
On Tue, Jul 16, 2002 at 01:27:24PM -0400, Chris Mason wrote:
> On Tue, 2002-07-16 at 12:31, Joe Thornber wrote:
>
> > > Joe, are you absolutely sure these tests had the disk cache disabled? That's
> > > the only hardware thing I can think of that would make a difference.
> >
> > Absolutely sure. Those figures were for a pair of PVs that were
> > sharing an IDE cable so I can certainly get things moving faster.
>
> Some IDE drives ignore commands to turn off the write back cache, or
> turn it back on when load gets high.
>
I have reproduced Joes flat graph with SCSI & Fibre-channel drives so I wouldn't
read too much into his cabling :-)
patrick
next prev parent reply other threads:[~2002-07-16 13:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-12 18:26 [linux-lvm] Re: [Announce] device-mapper beta3 (fast snapshots) Andrew Theurer
2002-07-15 4:00 ` Joe Thornber
2002-07-15 9:44 ` Andrew Theurer
2002-07-15 7:40 ` Joe Thornber
2002-07-15 14:13 ` Kevin Corry
2002-07-16 3:42 ` Joe Thornber
2002-07-16 11:11 ` Andrew Theurer
2002-07-16 11:32 ` Joe Thornber
2002-07-16 12:26 ` Chris Mason
2002-07-16 13:05 ` Patrick Caulfield [this message]
2002-07-17 5:31 ` Joe Thornber
2002-07-17 5:35 ` Alan Cox
2002-07-16 13:13 ` [linux-lvm] " James Manning
2002-07-17 6:03 ` Joe Thornber
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