All of lore.kernel.org
 help / color / mirror / Atom feed
From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
Date: Mon, 09 Apr 2012 00:27:29 -0500	[thread overview]
Message-ID: <4F827341.2000607@hardwarefreak.com> (raw)
In-Reply-To: <20120408234555.695e291f@galadriel.home>

On 4/8/2012 4:45 PM, Emmanuel Florac wrote:
> Le Sun, 08 Apr 2012 15:33:01 -0500 vous écriviez:
> 
>>>
>>> From my experience, with modern arrays don't make much of a
>>> difference. I've reached decent IOPS (i. e. about 4000 IOPS) on
>>> large arrays of up to 46 drives provided there are enough threads
>>> -- more threads than spindles, preferably.  
>>
>> Are you speaking of a mixed metadata/data heavy IOPS workload similar
>> to that which is the focus of this thread, or another type of
>> workload?  Is this 46 drive array RAID10 or RAID6?
> 
> Pure random access, 8K IO benchmark (database simulation). RAID-6
> performs about the same in pure reading tests, but stinks terribly at
> writing of course.

In your RAID10 random write testing, was this with a filesystem or doing
direct block IO?  If the latter, I wonder if its write pattern is
anything like the access pattern we'd see hitting dozens of AGs while
creating 10s of thousands of files.

-- 
Stan

_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs

  reply	other threads:[~2012-04-09  5:27 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
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 [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4F827341.2000607@hardwarefreak.com \
    --to=stan@hardwarefreak.com \
    --cc=xfs@oss.sgi.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.