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From Adam Phelps <...@opendns.com>
Subject Re: HDFS drive, partition best practice
Date Tue, 08 Feb 2011 19:33:13 GMT
On 2/7/11 2:06 PM, Jonathan Disher wrote:
> Currently I have a 48 node cluster using Dell R710's with 12 disks - two
> 250GB SATA drives in RAID1 for OS, and ten 1TB SATA disks as a JBOD
> (mounted on /data/0 through /data/9) and listed separately in
> hdfs-site.xml. It works... mostly. The big issues you will encounter is
> losing a disk - the DataNode process will crash, and if you comment out
> the affected drive, when you replace it you will have 9 disks full to N%
> and one empty disk.

If DataNode is going down after a single disk failure then you probably 
haven't set dfs.datanode.failed.volumes.tolerated in hdfs-site.xml.  You 
can up that number to allow DataNode to tolerate dead drives.

- Adam

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