We have dell 1950s, I didn't do the setup, but from what I recall... basically you have no choice but to use the raid controller. Think of it as a super advanced SATA controller instead. But the Dell 1950 raid card did NOT support jbod from what I recalled. You can raid0 it (Stripe only), and maybe you can concatenate the drives, which is not ideal. But without doing some srs internal surgery, which might not be possible, no jbod. Maybe a firmware update adds it back in? Presumably dell figures if you are buying a machine with a raid controller you'll raid the disks, therefore other modes not supported.
-ryan On Tue, Feb 1, 2011 at 12:34 PM, Edward Capriolo <[email protected]> wrote: > On Tue, Feb 1, 2011 at 3:17 PM, Joseph Coleman > <[email protected]> wrote: >> Sorry that was a typo on the amount of Master node although what is the >> limitation of how many masters you can have? Thank you for the feedback on >> the JBOD however, I am a little lost on the setup of it. Looking at a Dell >> 1950 or 2950 I do not see that as an option in the raid controller setup >> nor do I see that as an option when setting up Ubuntu. Is this a hardware >> or software option after the fact? Do I just setup raid0 do a ext root vol >> and then run a command to convert to JBOD. Sorry for the ignorance this is >> just new to me and I want to get it right the first time. >> >> Thanks >> >> >> >> >> On 2/1/11 10:06 AM, "Sean Bigdatafun" <[email protected]> wrote: >> >>>- hbase-user >>> >>>No raid should be used, use JBOD instead. I do not think you can setup 3 >>>master nodes in current Hadoop version, can you explain why you believe >>>so? >>> >>>Thanks, >>> >>> >>>On Tue, Feb 1, 2011 at 7:50 AM, Joseph Coleman < >>>[email protected]> wrote: >>> >>>> Hi all not sure where to ask this question but here it goes. I have been >>>> playing with Hadoop for a while now in a test environment before we >>>>setup >>>> and deploy a productions environment. I am using Hadoop 0.20.0 on >>>>Ubuntu >>>> 10.04 LTS install on Dell 1950's currently. >>>> >>>> My question is what raid should I be using for my data nodes? I haven't >>>> come across anything that clearly spells it out I have used raid1 and >>>>then >>>> EXT4 filesystem but I know this isn't right after further research but >>>>not >>>> sure what do do. I will be setting up 3 masters in a cluster which I >>>>will >>>> raid out. And roughly 10 datanodes running hdfs and hbase and a separate >>>> zookeeper cluster. Any thoughts or recommendations on the clustering >>>>would >>>> be much appreciated. >>>> >>>> Thanks, >>>> Joe >>>> >>>> >>>> >>> >>> >>>-- >>>--Sean >> >> > > JBOD in your case means either: > 1) Do not use your RAID controller > 2) Setup your raid controller with N devices using a 1 to 1 mapping > with physical disks > /dev/sda -> disk1 > /dev/sdb -> disk2 > ... > Good luck. >
