Friday, August 17, 2018

Notes on Ceph RADOS paper

Why PGs?
PGs enable a balanced distribution of objects. Without PGs, there are two ways to distribute objects:
a. Mirroring on other OSDs
b. Keep a copy of object on all the nodes in the cluster (declustering)

PGs provide a way to replicate a set of objects in a fault-tolerant manner.

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