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Posted to common-user@hadoop.apache.org by jiang licht <li...@yahoo.com> on 2010/08/26 01:15:53 UTC

data node disk usage per volume?

"dfs.datanode.du.reserved" can limit the size of space per volume that can be used by a data node. I have 2 related questions.

1. How "volume" is defined here?
Say I have 2 folders listed for "dfs.data.dir" and each resides on a different disk. By setting "dfs.datanode.du.reserved" to N, does it mean 2N bytes reserved for non-dfs use, with N bytes on each disk?

2. Is it possible that we can reserve different size of space to non-dfs use on different disks?

Thanks,

Michael