On 06/11/2014 12:51 PM, Florent B wrote:
Hi,
I would like to know if Ceph uses CRUSH algorithm when a read operation
occurs, for example to select the nearest OSD storing the asked object.
CRUSH is used when reading since it's THE algorithm inside Ceph to
determine data placement.
CRUSH doesn't support reading the nearest object, it will always read
from the primary OSD for a PG, but you can influence the primary affinity.
Thank you :)
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Wido den Hollander
Ceph consultant and trainer
42on B.V.
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