On 09/08/2014 09:57 AM, Jakes John wrote:
Hi all,
I have been reading ceph-crush-location hook (
http://ceph.com/docs/master/rados/operations/crush-map/ ) which says to
add crush location field in the conf file to provide location awareness
to ceph deamons and clients. I would like to understand whether ceph use
this location awareness information internally for placing read/write
requests of objects. I couldn't find related details anywhere in the
documentation.
I used this recently for a deployment with servers mixed with SSDs and
HDDs. I used this location lookup script:
https://gist.github.com/wido/5d26d88366e28e25e23d
This way I have a 'hostname-ssd' and 'hostname-hdd' bucket for each
machine. I can then create CRUSH rules using those machines to put data
on SSDs or HDDs.
Thanks
<http://ceph.com/docs/master/rados/operations/crush-map/#ceph-crush-location-hook>
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Wido den Hollander
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42on B.V.
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