Date: Sun, 4 Aug 2002 13:11:56 -0400 From: "Brian T. Schellenberger" <bts@babbleon.org> To: Nuno Teixeira <nunotex@pt-quorum.com>, freebsd-questions@freebsd.org Subject: Re: ata_tags and write_cache question (CORRECTED) Message-ID: <200208041311.56345.bts@babbleon.org> In-Reply-To: <20020804165444.GC51994@gw.tex.bogus> References: <20020804163925.GB51994@gw.tex.bogus> <20020804165444.GC51994@gw.tex.bogus>
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Well, what you should *not* do is to use "plain" (untagged) write cache and
softupdates at the same time, as the two together increase latency time even
more, and when I briefly did that I lost work that I'd done just before
shutting down, and left my file systems in a corrupt state (forced fsck on
reboot). I solved the problem by disabling write caching.
But in theory the tagging makes it safer.
I wouldn't recommend it, but it depends on your tolerance for risk vs. speed.
If you *do* do it, there are still potential latency problems. It would be
wise not to do a "shutdown -p" with this setup, but rahther to do "shutdown
-h" and then power off after waiting a few seconds until the disk has been
quiet for a while.
On Sunday 04 August 2002 12:54 pm, Nuno Teixeira wrote:
| Hello to all,
|
| I made a mistake.
|
| The right question is:
|
| Can we use ata tags (it implies write cache) AND softupdates
| simultaneosly? Or should only use this features separately?
|
| On Sun, Aug 04, 2002 at 05:39:25PM +0100, Nuno Teixeira wrote:
| > Hello to all,
| >
| > I have searched at google about using ata tags and write cache on
| > DTLA IBM disks but I haven't found a right answer to:
| >
| > Can we use ata tags and write cache simultaneosly? Or should only
| > use this features separately?
| >
| > Thanks very much,
| >
| > Nuno Teixeira
| >
| > --
| >
| > /*
| > PGP fingerprint:
| > C6D1 06ED EB54 A99C 6B14 6732 0A5D 810D 727D F6C6
| > */
| >
| > To Unsubscribe: send mail to majordomo@FreeBSD.org
| > with "unsubscribe freebsd-questions" in the body of the message
--
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