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From Doug Cutting <cutt...@apache.org>
Subject Re: Question about HDFS capacity and remaining
Date Fri, 30 Jan 2009 17:32:28 GMT
Bryan Duxbury wrote:
> Hm, very interesting. Didn't know about that. What's the purpose of the 
> reservation? Just to give root preference or leave wiggle room?

I think it's so that, when the disk is full, root processes don't fail, 
only user processes.  So you don't lose, e.g., syslog.  With modern 
disks, 5% is too much, especially for volumes that are only used for 
user data.  You can safely set this to 1%.


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