[Hadoop-common-user] Question about RAID controllers and hadoop

True, you need a P410 controller. You can create RAID0 for each disk to make it as JBOD.


-Bharath



________________________________
From: Koert Kuipers <[email protected]>
To: [email protected]
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

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
Sent: Thursday, August 11, 2011 5:00 PM
To: [email protected]
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 JBOD.


-Bharath



________________________________
From: Koert Kuipers <[email protected]>
To: [email protected]
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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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):

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
Sent: Thursday, August 11, 2011 5:17 PM
To: [email protected]
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):

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.


On 8/11/11 3:23 PM, "GOEKE, MATTHEW (AG/1000)" 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
Sent: Thursday, August 11, 2011 5:17 PM
To: [email protected]
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):

Hey Charles, I was considering using 8 drives, each set as RAID0, so its
good to hear such a setup is working for you.
Best Koert

[[email protected] bonnie++-1.03e]$ ./bonnie++ -d . -s 50000 -m P410 -f
Writing intelligently...done
Rewriting...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 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++


P410,50000M,,,68392,12,21153,3,,,116423,4,216.8,0,16,22238,33,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++



On 8/11/11 5:15 PM, "Mohit Anchlia" wrote: