From: Dave Chinner <david@fromorbit.com>
To: "Assarsson, Emil" <Emil.Assarsson@sonyericsson.com>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: XFS memory recomendation?
Date: Fri, 17 Feb 2012 13:49:41 +1100 [thread overview]
Message-ID: <20120217024941.GH14132@dastard> (raw)
In-Reply-To: <2BF070A7A2375D46BA1B6087F8D5DCB68BEA721CA3@seldmbx01.corpusers.net>
On Thu, Feb 16, 2012 at 12:50:57PM +0100, Assarsson, Emil wrote:
> Hi,
>
> Are there any recommendations about how much memory I need based
> on the size of the file system and/or amount of files? For
> example: how much memory would be optimal for a 20TB file system
> with 3000000 files?
/me shrugs
> I guess it depends on the usage pattern?
Totally.
> Is there any way to make sure that the file allocation table stays in the memory?
What's a "file allocation table"? XFS doesn't have one. :)
XFS does have a sophisticated metadata cache and reclaim scheme that
keeps frequently referenced metadata hot in cache, but you as a
user have very little control over that because the cache size is
effectively controlled by memory pressure. i.e. it's size is
completely workload dependent.....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2012-02-17 2:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 11:50 XFS memory recomendation? Assarsson, Emil
2012-02-17 2:49 ` Dave Chinner [this message]
2012-02-17 13:05 ` Michael Monnerie
2012-02-17 15:27 ` Assarsson, Emil
2012-02-18 1:14 ` Eric Sandeen
2012-02-18 1:58 ` Stan Hoeppner
2012-02-18 2:17 ` Eric Sandeen
2012-02-19 13:16 ` Michael Monnerie
2012-02-19 21:00 ` Eric Sandeen
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