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From Charles Wimmer <cwim...@yahoo-inc.com>
Subject Re: Question about RAID controllers and hadoop
Date Sun, 14 Aug 2011 23:00:37 GMT
[cwimmer@hostname bonnie++-1.03e]$ ./bonnie++ -d . -s 50000 -m P410 -f
Writing intelligently...done
Reading intelligently...done
start 'em...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version 1.03e       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
P410         50000M           68392  12 21153   3           116423   4 216.8   0
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 22238  33 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++


On 8/11/11 5:15 PM, "Mohit Anchlia" <mohitanchlia@gmail.com> wrote:

On Thu, Aug 11, 2011 at 3:26 PM, Charles Wimmer <cwimmer@yahoo-inc.com> wrote:
> We currently use P410s in 12 disk system.  Each disk is set up as a RAID0 volume.  Performance
is at least as good as a bare disk.

Can you please share what throughput you see with P410s? Are these SATA or SAS?

> On 8/11/11 3:23 PM, "GOEKE, MATTHEW (AG/1000)" <matthew.goeke@monsanto.com> wrote:
> If I read that email chain correctly then they were referring to the classic JBOD vs
multiple disks striped together conversation. The conversation that was started here is referring
to JBOD vs 1 RAID 0 per disk and the effects of the raid controller on those independent raids.
> Matt
> -----Original Message-----
> From: Kai Voigt [mailto:k@123.org]
> Sent: Thursday, August 11, 2011 5:17 PM
> To: common-user@hadoop.apache.org
> Subject: Re: Question about RAID controllers and hadoop
> Yahoo did some testing 2 years ago: http://markmail.org/message/xmzc45zi25htr7ry
> But updated benchmark would be interesting to see.
> Kai
> Am 12.08.2011 um 00:13 schrieb GOEKE, MATTHEW (AG/1000):
>> My assumption would be that having a set of 4 raid 0 disks would actually be better
than having a controller that allowed pure JBOD of 4 disks due to the cache on the controller.
If anyone has any personal experience with this I would love to know performance numbers but
our infrastructure guy is doing tests on exactly this over the next couple days so I will
pass it along once we have it.
>> Matt
>> -----Original Message-----
>> From: Bharath Mundlapudi [mailto:bharathwork@yahoo.com]
>> Sent: Thursday, August 11, 2011 5:00 PM
>> To: common-user@hadoop.apache.org
>> Subject: Re: Question about RAID controllers and hadoop
>> True, you need a P410 controller. You can create RAID0 for each disk to make it as
>> -Bharath
>> ________________________________
>> From: Koert Kuipers <koert@tresata.com>
>> To: common-user@hadoop.apache.org
>> Sent: Thursday, August 11, 2011 2:50 PM
>> Subject: Question about RAID controllers and hadoop
>> Hello all,
>> We are considering using low end HP proliant machines (DL160s and DL180s)
>> for cluster nodes. However with these machines if you want to do more than 4
>> hard drives then HP puts in a P410 raid controller. We would configure the
>> RAID controller to function as JBOD, by simply creating multiple RAID
>> volumes with one disk. Does anyone have experience with this setup? Is it a
>> good idea, or am i introducing a i/o bottleneck?
>> Thanks for your help!
>> Best, Koert
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> Kai Voigt
> k@123.org

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