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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: Question about HDFS capacity and remaining
Date Fri, 30 Jan 2009 17:59:16 GMT
Very interesting note for a new cluster checklist. Good to tune the
file system down from 5%.

On a related note some operating systems ::cough:: FreeBSD will report
negative disk space when you go over the quota. What does that mean?

We run nagios with NRPE to run remote disk checks. We configure our
alarms to warn at 5%. Image a process keeps using a disk.

Alarm 5% , Alarm4%, Alarm 3%,Alarm 2%, Alarm 1%, Alarm cleared 103%.
NRPE assumes disk % 0-100% comically if you drop below 100% the
monitor thinks the disk is fine again. This is like a signed/unsigned

I mention this not to show off, As people deploy hadoop on other
platforms issues like this might crop up. I am not saying it is an
issue, but it could be.

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