Date: Mon, 17 Nov 1997 14:54:41 -0600 From: Brett Rabe <brett@uswest.net> To: chuckr@Glue.umd.edu Cc: npp@neg-micon.dk, current@FreeBSD.ORG Subject: Re: async fs? Message-ID: <199711172054.OAA19807@phouka.oss.uswest.net> In-Reply-To: Your message of "Mon, 17 Nov 1997 12:23:38 EST." <199711171723.MAA28442@earth.mat.net>
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On Mon, 17 Nov 1997 12:23:38 EST, chuckr@Glue.umd.edu wrote:
>On 17 Nov, Nicolai Petri wrote:
>> I read something about mounting a drive in async mode, I wondered if this
>> will give me a performance increase on my proxy server.. And is it possible
>> to do it on all filesystems ??
>>
>Are you aware that losing your system while you are running async is
>usually fairly safe (often you lose no files, or if you were very busy
>doing disk activity, maybe a few), but if you are mounted async, you
>could possibly lose much, much more? It'll certainly increase
>performance, but you'd better be willing to pay the price.
Sure, you increase your risk of damage in the event of a system
failure.
But it's definitely worth it in certain cases. For example, I
switch all of my news servers' spool filesystems -- spool only --
to async for the duration of the nightly expire. It dramatically
speeds up the expire time, and the risk is acceptable. If I
lose one news machine for the length of time it takes me to
re-newfs and populate the machine... big deal. We've done this
for nearly a year without ever experiencing a total failure
of the filesystem.
Once in that year the machine crashed during the expire, and
aside from a rather lengthy fsck, everything recovered just fine.
Brett
---
Brett Rabe Email : brett@uswest.net
Systems Administrator - !nteract Services Phone : 612.664.3078
600 Stinson Blvd. Pager : 612.613.2549
Minneapolis, MN USA 55413 Fax : 612.664.4770
If you aren't the lead dog, the view is always the same.
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