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:bharathw...@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. > > > -Bharath > > > > ________________________________ > From: Koert Kuipers <ko...@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 > This e-mail message may contain privileged and/or confidential information, > and is intended to be received only by persons entitled > to receive such information. If you have received this e-mail in error, > please notify the sender immediately. Please delete it and > all attachments from any servers, hard drives or any other media. Other use > of this e-mail by you is strictly prohibited. > > All e-mails and attachments sent and received are subject to monitoring, > reading and archival by Monsanto, including its > subsidiaries. The recipient of this e-mail is solely responsible for checking > for the presence of "Viruses" or other "Malware". > Monsanto, along with its subsidiaries, accepts no liability for any damage > caused by any such code transmitted by or accompanying > this e-mail or any attachment. > > > The information contained in this email may be subject to the export control > laws and regulations of the United States, potentially > including but not limited to the Export Administration Regulations (EAR) and > sanctions regulations issued by the U.S. Department of > Treasury, Office of Foreign Asset Controls (OFAC). As a recipient of this > information you are obligated to comply with all > applicable U.S. export laws and regulations. > > -- Kai Voigt k...@123.org
