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Re: IDE write cache and journaling file systems

To: linux-xfs@xxxxxxxxxxx
Subject: Re: IDE write cache and journaling file systems
From: Jim Buzbee <James.Buzbee@xxxxxxxxxxxx>
Date: Thu, 18 Apr 2002 10:46:22 -0600
References: <3CBEE618.B220A393@xxxxxxxxxxx> <1019144692.10200.8.camel@xxxxxxxxxxxxxxxxxxxx> <20020418175314.A21976@xxxxxxxxxxxxx> <20020418160344.GM2492@xxxxxxx> <1019145843.10294.10.camel@xxxxxxxxxxxxxxxxxxxx> <3CBEF19B.9CFD9D99@xxxxxxxxxxxx> <1019147772.13561.9.camel@xxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
Tony Gale wrote:
> 
> On Thu, 2002-04-18 at 17:17, Jim Buzbee wrote:
> > Steve Lord wrote:
> >
> > > > ? Both the SuSE kernel has the infrastructure, and the 2.5 kernels so as
> > > > well.
> > >
> > > Unless I am mistaken, Jim is tied down to a fairly old kernel.
> >
> > Yep, we're on 2.4.8 with the current box under development.
> >
> > Jim
> >
> 
> Have you thought about using ext3 in data=journal mode instead?

One feature we require that only XFS provides (as far as I know) is the
ability to punch holes in files.  We continually record video to a file
and when the file gets too large, we just chop off the front and keep
writing.

> 
> Also make sure your disk honours the ATA write cache flush command, and
> that it doesn't throw away the cache contents on reboot/suspend.

That's an interesting thought.  The box can be reset (by the user
pulling the smart card) without losing power. So I guess in that case,
the IDE buffer would still get flushed. 

Jim


> 
> -tony


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