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From: Emmanuel Florac <eflorac@intellique.com>
To: Stefan Ring <stefanrin@gmail.com>
Cc: stan@hardwarefreak.com, Linux fs XFS <xfs@oss.sgi.com>
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
Date: Sat, 7 Apr 2012 10:53:18 +0200	[thread overview]
Message-ID: <20120407105318.7d31b413@galadriel.home> (raw)
In-Reply-To: <CAAxjCEyJW1b4dbKctbrgdWjykQt8Hb4Sw1RKdys3oUsehNHCcQ@mail.gmail.com>

Le Sat, 7 Apr 2012 09:27:50 +0200 vous écriviez:

> So it sounds like that for poor guys like us, who can’t afford the
> hardware to have dozens of spindles, the best option would be to
> create the XFS file system with agcount=1? That seems to be the only
> reasonable conclusion to me, since a single RAID device, like a single
> disk, cannot write in parallel anyway.

You best option is to buy a SSD. Seriously, even a basic decent consumer
model will bury your array in the dust. Also, recent RAID controllers
from LSI and Adaptec are able to "enhance" a spinning rust array by
using an SSD as a cache.

-- 
------------------------------------------------------------------------
Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac@intellique.com>
                    |   +33 1 78 94 84 02
------------------------------------------------------------------------

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  reply	other threads:[~2012-04-07  8:53 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-05 18:10 XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?) Stefan Ring
2012-04-05 19:56 ` Peter Grandi
2012-04-05 22:41   ` Peter Grandi
2012-04-06 14:36   ` Peter Grandi
2012-04-06 15:37     ` Stefan Ring
2012-04-07 13:33       ` Peter Grandi
2012-04-05 21:37 ` Christoph Hellwig
2012-04-06  1:09   ` Peter Grandi
2012-04-06  8:25   ` Stefan Ring
2012-04-07 18:57     ` Martin Steigerwald
2012-04-10 14:02       ` Stefan Ring
2012-04-10 14:32         ` Joe Landman
2012-04-10 15:56           ` Stefan Ring
2012-04-10 18:13         ` Martin Steigerwald
2012-04-10 20:44         ` Stan Hoeppner
2012-04-10 21:00           ` Stefan Ring
2012-04-05 22:32 ` Roger Willcocks
2012-04-06  7:11   ` Stefan Ring
2012-04-06  8:24     ` Stefan Ring
2012-04-05 23:07 ` Peter Grandi
2012-04-06  0:13   ` Peter Grandi
2012-04-06  7:27     ` Stefan Ring
2012-04-06 23:28       ` Stan Hoeppner
2012-04-07  7:27         ` Stefan Ring
2012-04-07  8:53           ` Emmanuel Florac [this message]
2012-04-07 14:57           ` Stan Hoeppner
2012-04-09 11:02             ` Stefan Ring
2012-04-09 12:48               ` Emmanuel Florac
2012-04-09 12:53                 ` Stefan Ring
2012-04-09 13:03                   ` Emmanuel Florac
2012-04-09 23:38               ` Stan Hoeppner
2012-04-10  6:11                 ` Stefan Ring
2012-04-10 20:29                   ` Stan Hoeppner
2012-04-10 20:43                     ` Stefan Ring
2012-04-10 21:29                       ` Stan Hoeppner
2012-04-09  0:19           ` Dave Chinner
2012-04-09 11:39             ` Emmanuel Florac
2012-04-09 21:47               ` Dave Chinner
2012-04-07  8:49         ` Emmanuel Florac
2012-04-08 20:33           ` Stan Hoeppner
2012-04-08 21:45             ` Emmanuel Florac
2012-04-09  5:27               ` Stan Hoeppner
2012-04-09 12:45                 ` Emmanuel Florac
2012-04-13 19:36                   ` Stefan Ring
2012-04-14  7:32                     ` Stan Hoeppner
2012-04-14 11:30                       ` Stefan Ring
2012-04-09 14:21         ` Geoffrey Wehrman
2012-04-10 19:30           ` Stan Hoeppner
2012-04-11 22:19             ` Geoffrey Wehrman
2012-04-07 16:50       ` Peter Grandi
2012-04-07 17:10         ` Joe Landman
2012-04-08 21:42           ` Stan Hoeppner
2012-04-09  5:13             ` Stan Hoeppner
2012-04-09 11:52               ` Stefan Ring
2012-04-10  7:34                 ` Stan Hoeppner
2012-04-10 13:59                   ` Stefan Ring
2012-04-09  9:23             ` Stefan Ring
2012-04-09 23:06               ` Stan Hoeppner
2012-04-06  0:53   ` Peter Grandi
2012-04-06  7:32     ` Stefan Ring
2012-04-06  5:53   ` Stefan Ring
2012-04-06 15:35     ` Peter Grandi
2012-04-10 14:05       ` Stefan Ring
2012-04-07 19:11     ` Peter Grandi

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