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Re: [Question #226895]: carbon-cache IO reads problem

To: graphite-dev@xxxxxxxxxxxxxxxxxxx
From: kaarel <question226895@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 05 Mar 2014 07:46:28 -0000
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Question #226895 on Graphite changed:
https://answers.launchpad.net/graphite/+question/226895

kaarel posted a new comment:
Added enough RAM so that hot data can fit inside kernel page cache. The
problem was that each write does also a read. Even more reads are done
if aggregation rules are defined in storage-schemas.conf (e.g:
15s:7d,1m:21d).

So solutions are: fast SSD-s or enough RAM. Currently I'm running one
carbon instance at approx 50k updates/minute with total data-set
~200-300GB using 6GB RAM. But the amount of RAM varies as your hot data
size varies.

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