linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <20070805014926.400d0608@the-village.bc.nu>
Date:	Sun, 5 Aug 2007 01:49:26 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Claudio Martins <ctpm@....utl.pt>
Cc:	Jeff Garzik <jeff@...zik.org>, Ingo Molnar <mingo@...e.hu>,
	Jörn Engel <joern@...fs.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk, david@...g.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

>  Can you give examples of backup solutions that rely on atime being updated?
> I can understand backup tools using mtime/ctime for incremental backups (like 
> tar + Amanda, etc), but I'm having trouble figuring out why someone would 
> want to use atime for that.

HSM is the usual one, and to a large extent probably why Unix originally
had atime. Basically migrating less used files away so as to keep the
system disks tidy.

Its not something usally found on desktop boxes so it doesn't in anyway
argue against the distribution using noatime or relative atime, but on
big server boxes it matters

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