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From: Charles Polisher <cpolish@surewest.net>
To: keld@keldix.com
Cc: Peter Rabbitson <rabbit+list@rabbit.us>,
	Phil Turmel <philip@turmel.org>,
	linux-raid@vger.kernel.org
Subject: Re: Suboptimal raid6 linear read speed
Date: Tue, 15 Jan 2013 20:43:35 -0800	[thread overview]
Message-ID: <20130116044335.GA10165@kevin> (raw)
In-Reply-To: <20130115195707.GA30921@www5.open-std.org>

keld@keldix.com wrote:
> >                                         Advantage     Advantage
> >                                         vs 4 drives   vs RAID0
> > Config  Drives  Seq write   Seq  read   Write  Read   Write Read
> > ------  ------  ----------  ----------  ----- -----   ----  ----
> > RAID0   4        8.1MB/sec   9.3MB/sec   1.00  1.00   1.00  1.00
> > RAID0   8       16.8MB/sec  15.0MB/sec   2.07  1.61   1.00  1.00
> >  
> > RAID1   4        2.1MB/sec   3.6MB/sec   1.00  1.00   0.25  0.38
> > RAID1   8        1.6MB/sec   3.6MB/sec   0.76  1.00   0.09  0.24
> > 
> > RAID5   4       16.8MB/sec   9.1MB/sec   1.00  1.00   2.07  0.97
> > RAID5   8       17.2MB/sec  14.9MB/sec   1.02  1.63   2.12  1.60
> > 
> > RAID6   4       12.6MB/sec   7.9MB/sec   1.00  1.00   1.55  0.84
> > RAID6   8       14.4MB/sec  14.5MB/sec   1.63  1.83   1.77  1.55
> > 
> > RAID10  4        4.0MB/sec   7.3MB/sec   1.00  1.00   0.49  0.78
> > RAID10  8        6.3MB/sec  13.4MB/sec   1.57  1.83   0.37  0.89
> > 
> What layout are you using for RAID10?
> Is it Linux MD RAID10?

# cat /proc/mdstat 
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] 
md1 : active raid10 sdi[7] sdh[6] sdg[5] sdf[4] sde[3] sdd[2] sdc[1] sdb[0]
      2118656 blocks 64K chunks 2 near-copies [8/8] [UUUUUUUU]



  reply	other threads:[~2013-01-16  4:43 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-15 12:33 Suboptimal raid6 linear read speed Peter Rabbitson
2013-01-15 12:45 ` Mikael Abrahamsson
2013-01-15 12:56   ` Peter Rabbitson
2013-01-15 16:13     ` Mikael Abrahamsson
2013-01-15 12:49 ` Phil Turmel
2013-01-15 12:55   ` Peter Rabbitson
2013-01-15 17:09     ` Charles Polisher
2013-01-15 19:57       ` keld
2013-01-16  4:43         ` Charles Polisher [this message]
2013-01-16  6:37           ` Tommy Apel Hansen
2013-01-16  9:36           ` keld
2013-01-16 16:09             ` Charles Polisher
2013-01-16 20:40               ` EJ Vincent
2013-01-15 23:17     ` Phil Turmel
2013-01-16  2:48     ` Stan Hoeppner
2013-01-16  2:58       ` Peter Rabbitson
2013-01-16 20:29         ` Stan Hoeppner
2013-01-16 21:20           ` Roy Sigurd Karlsbakk
2013-01-17 15:51           ` Mikael Abrahamsson
2013-01-18  8:31             ` Stan Hoeppner
2013-01-18  9:18               ` Mikael Abrahamsson
2013-01-18 22:56                 ` Stan Hoeppner
2013-01-19  7:43                   ` Mikael Abrahamsson
2013-01-19 22:48                     ` Stan Hoeppner
2013-01-19 23:51                       ` Maarten
2013-01-20  0:16                         ` Chris Murphy
2013-01-20  0:49                           ` Maarten
2013-01-20  1:37                             ` Phil Turmel
2013-01-20  9:44                             ` Chris Murphy
2013-01-20  6:26                           ` Mikael Abrahamsson
2013-01-20  9:39                             ` Chris Murphy
2013-01-20 16:55                               ` Mikael Abrahamsson
2013-01-20 17:15                                 ` Chris Murphy
2013-01-20 17:17                                   ` Mikael Abrahamsson
2013-01-20 17:20                                     ` Chris Murphy
2013-01-19 23:53                       ` Phil Turmel
2013-01-20  9:04                     ` Wolfgang Denk
2013-01-20 19:28                     ` Peter Grandi
2013-01-20 21:09                       ` Mikael Abrahamsson
2013-01-20 21:50                         ` Peter Grandi
2013-01-21  5:24                           ` Mikael Abrahamsson
2013-01-21 14:40                       ` Peter Rabbitson
2013-01-21 20:32                         ` Peter Grandi
2013-01-21 20:55                           ` Peter Grandi
2013-01-21 22:00                         ` Peter Grandi
2013-01-19 13:21                   ` Roy Sigurd Karlsbakk

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