From: Greg Stark <gsstark@mit.edu>
To: "Mudama, Eric" <eric_mudama@Maxtor.com>
Cc: "'Daniel B.'" <dsb@smart.net>, linux-kernel@vger.kernel.org
Subject: Re: IDE DMA errors, massive disk corruption: Why? Fixed Yet? W hy not re-do failed op?
Date: 09 Oct 2003 21:10:18 -0400 [thread overview]
Message-ID: <87llrt99tx.fsf@stark.dyndns.tv> (raw)
In-Reply-To: <785F348679A4D5119A0C009027DE33C105CDB20A@mcoexc04.mlm.maxtor.com>
"Mudama, Eric" <eric_mudama@Maxtor.com> writes:
> If the disk has write cache enabled, this isn't necessarilly possible, since
> there's nothing in the IDE specification that guarantees the order of writes
> to the media without a FLUSH CACHE (EXT) command.
So, uhm, is there an interface exporting this command to applications?
Databases like Postgres would love to be able to issue such a command.
As it stands they have to do some awful hacks with fsync and sync. Postgres in
particular at certain points just calls sync and then waits an arbitrary time
hoping that that should be enough to get everything to disk.
Some users have in fact resorted to disabling the cache on their ide drives.
And of course it absolutely demolishes performance. Having it be disabled just
at the few points in time when it actually matters would be a huge improvement.
--
greg
next prev parent reply other threads:[~2003-10-10 1:10 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-06 19:32 IDE DMA errors, massive disk corruption: Why? Fixed Yet? W hy not re-do failed op? Mudama, Eric
2003-10-06 20:20 ` IDE DMA errors, massive disk corruption: Why? Fixed Yet? Why " Daniel B.
2003-10-06 20:45 ` Valdis.Kletnieks
2003-10-06 21:07 ` Daniel B.
2003-10-06 21:26 ` Jeff Garzik
2003-10-07 5:24 ` IDE DMA errors, massive disk corruption: Why? Fixed Yet? Whynot " Daniel B.
2003-10-07 6:03 ` Valdis.Kletnieks
2003-10-07 12:23 ` Ruth Ivimey-Cook
2003-10-07 13:46 ` IDE DMA errors, massive disk corruption: Why? Fixed Yet? Whynotre-do " Daniel B.
2003-10-07 13:32 ` IDE DMA errors, massive disk corruption: Why? Fixed Yet? Why not re-do " Daniel B.
2003-10-10 1:10 ` Greg Stark [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-10-06 20:46 IDE DMA errors, massive disk corruption: Why? Fixed Yet? W hy " Mudama, Eric
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