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From: Stefan Ring <stefanrin@gmail.com>
To: Linux fs XFS <xfs@oss.sgi.com>
Subject: Re: A little RAID experiment
Date: Wed, 10 Oct 2012 16:57:47 +0200	[thread overview]
Message-ID: <CAAxjCEwYyzTLTJk7SU0t=1SnT-V=7VadtKd0v9qj0soXtJ8XTg@mail.gmail.com> (raw)
In-Reply-To: <CAAxjCEzh3+doupD=LmgqSbCeYWzn9Ru-vE4T8tOJmoud+28FDQ@mail.gmail.com>

Btw, one of our customers recently aquired new gear with HP SmartArray
Gen8 controllers. Now they are something to get excited about! This is
the kind of write performance I would expect from an expensive server
product. Check this out (this is again my artificial benchmark as well
as random write of 4K blocks):

SmartArray P400, 6 300G disks (10k, SAS) RAID 6, 256M BBWC:

ag4
Read 0b  Written 161.56Mb  Total transferred 161.56Mb  (5.3853Mb/sec)
 1378.63 Requests/sec executed

random write
Read 0b  Written 97.578Mb  Total transferred 97.578Mb  (3.2526Mb/sec)
  832.66 Requests/sec executed

SmartArray Gen8, 8 300G disks (15k, SAS) RAID 5, 2GB FBWC:

ag4
Read 0b  Written 2.4575Gb  Total transferred 2.4575Gb  (83.883Mb/sec)
21474.03 Requests/sec executed

random write
Read 0b  Written 343.86Mb  Total transferred 343.86Mb  (11.462Mb/sec)
 2934.24 Requests/sec executed

So yeah, the disks are a bit faster. But what does that matter when
there is such a huge difference otherwise?

Unfortunately, while composing this text, I noticed that the new one
is configured as RAID 5, and I cannot change it because of HP's
licensing policy. That makes it not a meaningful comparison, although
extrapolation from previous SmartArray controllers would suggest that
the RAID5 and RAID6 performance is comparable.

My subjective impression is still a very good one!

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  parent reply	other threads:[~2012-10-10 14:56 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-25  8:07 A little RAID experiment Stefan Ring
2012-04-25 14:17 ` Roger Willcocks
2012-04-25 16:23   ` Stefan Ring
2012-04-27 14:03     ` Stan Hoeppner
2012-04-26  8:53   ` Stefan Ring
2012-04-27 15:10     ` Stan Hoeppner
2012-04-27 15:28     ` Joe Landman
2012-04-28  4:42       ` Stan Hoeppner
2012-04-27 13:50 ` Stan Hoeppner
2012-05-01 10:46   ` Stefan Ring
2012-05-30 11:07     ` Stefan Ring
2012-05-31  1:30       ` Stan Hoeppner
2012-05-31  6:44         ` Stefan Ring
2012-07-16 19:57 ` Stefan Ring
2012-07-16 20:03   ` Stefan Ring
2012-07-16 20:05     ` Stefan Ring
2012-07-16 21:27   ` Stan Hoeppner
2012-07-16 21:58     ` Stefan Ring
2012-07-17  1:39       ` Stan Hoeppner
2012-07-17  5:26         ` Dave Chinner
2012-07-18  2:18           ` Stan Hoeppner
2012-07-18  6:44             ` Stefan Ring
2012-07-18  7:09               ` Stan Hoeppner
2012-07-18  7:22                 ` Stefan Ring
2012-07-18 10:24                   ` Stan Hoeppner
2012-07-18 12:32                     ` Stefan Ring
2012-07-18 12:37                       ` Stefan Ring
2012-07-19  3:08                         ` Stan Hoeppner
2012-07-25  9:29                           ` Stefan Ring
2012-07-25 10:00                             ` Stan Hoeppner
2012-07-25 10:08                               ` Stefan Ring
2012-07-25 11:00                                 ` Stan Hoeppner
2012-07-26  8:32                             ` Dave Chinner
2012-09-11 16:37                               ` Stefan Ring
2012-07-16 22:16     ` Stefan Ring
2012-10-10 14:57 ` Stefan Ring [this message]
2012-10-10 21:27   ` Dave Chinner
2012-10-10 22:01     ` Stefan Ring
2012-04-26 22:33 Richard Scobie
2012-04-27 21:30 ` Emmanuel Florac
2012-04-28  4:15   ` Richard Scobie

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