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From "GOEKE, MATTHEW (AG/1000)" <matthew.go...@monsanto.com>
Subject RE: Question about RAID controllers and hadoop
Date Thu, 11 Aug 2011 22:13:31 GMT
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.


-----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 JBOD.


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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