From: Brad Campbell <lists2009@fnarfbargle.com>
To: thomas@fjellstrom.ca
Cc: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: recommended way to add ssd cache to mdraid array
Date: Thu, 10 Jan 2013 21:13:38 +0800 [thread overview]
Message-ID: <50EEBE82.10501@fnarfbargle.com> (raw)
In-Reply-To: <201212222044.27731.thomas@fjellstrom.ca>
On 23/12/12 11:44, Thomas Fjellstrom wrote:
>
> moose@mrbig:/mnt/mrbig/data/test$ iozone -a -s 32G -r 8M
> random random
> bkwd record stride
> KB reclen write rewrite read reread read write
> read rewrite read fwrite frewrite fread freread
> 33554432 8192 212507 210382 630327 630852 372807 161710
> 388319 4922757 617347 210642 217122 717279 716150
>
> Is this normal for a 7 disk (2TB seagate barracudas) raid array on a pcie x8
> sas controller?
>
For comparo using the same command line. This is a running system and
has a slight but measurable load on the array, but not enough that it
should really impact the numbers.
This is 10 x WD 2TB Green drives (sloooow) in RAID-6 on a pair of those
cards. Formatted ext4.
mpt2sas0: LSISAS2008: FWVersion(15.00.00.00), ChipRevision(0x02),
BiosVersion(00.00.00.00)
md0 : active raid6 sdl[0] sdr[5] sdo[6] sdp[7] sdn[8] sdk[9] sdm[10]
sdq[11] sds[4] sdf[12]
15628106752 blocks super 1.2 level 6, 128k chunk, algorithm 2
[10/10] [UUUUUUUUUU]
bitmap: 2/15 pages [8KB], 65536KB chunk
random
random bkwd record stride
KB reclen write rewrite read reread read
write read rewrite read fwrite frewrite fread freread
33554432 8192 349745 448840 481170 488821 284313
312892 355422 2288708 440818 397878 469964 478596 496619
Not sure this actually means anything though.
Regards,
Brad
prev parent reply other threads:[~2013-01-10 13:13 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-22 6:57 recommended way to add ssd cache to mdraid array Thomas Fjellstrom
2012-12-23 3:44 ` Thomas Fjellstrom
2013-01-09 18:41 ` Thomas Fjellstrom
2013-01-10 6:25 ` Chris Murphy
2013-01-10 10:49 ` Thomas Fjellstrom
2013-01-10 21:36 ` Chris Murphy
2013-01-11 0:18 ` Stan Hoeppner
2013-01-11 12:35 ` Thomas Fjellstrom
2013-01-11 12:48 ` Thomas Fjellstrom
2013-01-14 0:05 ` Tommy Apel Hansen
2013-01-14 8:58 ` Thomas Fjellstrom
2013-01-14 18:22 ` Thomas Fjellstrom
2013-01-14 19:45 ` Stan Hoeppner
2013-01-14 21:53 ` Thomas Fjellstrom
2013-01-14 22:51 ` Chris Murphy
2013-01-15 3:25 ` Thomas Fjellstrom
2013-01-15 1:50 ` Stan Hoeppner
2013-01-15 3:52 ` Thomas Fjellstrom
2013-01-15 8:38 ` Stan Hoeppner
2013-01-15 9:02 ` Tommy Apel
2013-01-15 11:19 ` Stan Hoeppner
2013-01-15 10:47 ` Tommy Apel
2013-01-16 5:31 ` Thomas Fjellstrom
2013-01-16 8:59 ` John Robinson
2013-01-16 21:29 ` Stan Hoeppner
2013-02-10 6:59 ` Thomas Fjellstrom
2013-01-16 22:06 ` Stan Hoeppner
2013-01-14 21:38 ` Tommy Apel Hansen
2013-01-14 21:47 ` Tommy Apel Hansen
2013-01-11 12:20 ` Thomas Fjellstrom
2013-01-11 17:39 ` Chris Murphy
2013-01-11 17:46 ` Chris Murphy
2013-01-11 18:52 ` Thomas Fjellstrom
2013-01-12 0:47 ` Phil Turmel
2013-01-12 3:56 ` Chris Murphy
2013-01-13 22:13 ` Phil Turmel
2013-01-13 23:20 ` Chris Murphy
2013-01-14 0:23 ` Phil Turmel
2013-01-14 3:58 ` Chris Murphy
2013-01-14 22:00 ` Thomas Fjellstrom
2013-01-11 18:51 ` Thomas Fjellstrom
2013-01-11 22:17 ` Stan Hoeppner
2013-01-12 2:44 ` Thomas Fjellstrom
2013-01-12 8:33 ` Stan Hoeppner
2013-01-12 14:44 ` Thomas Fjellstrom
2013-01-13 19:18 ` Chris Murphy
2013-01-14 9:06 ` Thomas Fjellstrom
2013-01-11 18:50 ` Stan Hoeppner
2013-01-12 2:45 ` Thomas Fjellstrom
2013-01-12 12:06 ` Roy Sigurd Karlsbakk
2013-01-12 14:14 ` Stan Hoeppner
2013-01-12 16:37 ` Roy Sigurd Karlsbakk
2013-01-10 13:13 ` Brad Campbell [this message]
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