Date: Mon, 12 Mar 2001 18:15:39 -0500 From: Mike Tancsa <mike@sentex.net> To: Matt Dillon <dillon@earth.backplane.com> Cc: Soren Schmidt <sos@freebsd.dk>, stable@FreeBSD.ORG Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <4.2.2.20010312181414.02c135a8@marble.sentex.net> In-Reply-To: <200103122310.f2CNANH77246@earth.backplane.com> References: <200103122036.VAA99695@freebsd.dk> <200103122146.f2CLkLs08952@ptavv.es.net> <20010312140636.A18351@fw.wintelcom.net>
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Is there an equivalent low level IDE util of "sync" that can force the
drive to write out it's cache ?
---Mike
At 03:10 PM 3/12/2001 -0800, Matt Dillon wrote:
> It's actually worse. Someone, I forget who, ran some tests with
> write-caching turned on and found that the IDE drive could hold a
> pending write in its cache 'forever', even in the face of other writes,
> as long as there was other disk activity going on. So we aren't just
> talking about issuing I/O's out of order, we are talking about issuing
> a sequence of writes and having some of them simply not ever commiting
> to disk (not for a long, long time) in a heavily loaded environment.
> That's bad news.
>
> -Matt
>
>
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