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ceph replication

asked 2016-10-24 10:52:09 -0600

Javi gravatar image

Hello. In our environment we have 3 controllers and 2 computes. Both computes has Ceph OSD role and I configured Ceph for volumes, images, ephemeral volumes and Ceph RadosGW for objects.

Also I have the ceph object replication factor to 2 so If don't misunderstoood, It means if I create a instance, it replicate to both computes... So if one of them shuts down, the second compute switch on the instance, right?

This is why I say misunderstood, but I shot down a Compute and the instance also shot down and it won't up. Is that correct?

The instance is no balanced to another computer?

Thank you.

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answered 2016-10-24 23:18:21 -0600

Ceph only replicates data, not instances. If one of the OSDs shuts down, the data is still accessible thanks to the second OSD. But any instance on the shut-down node will be down. OpenStack doesn't automatically migrate instances. Search for "migration" and "evacuation" on

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Asked: 2016-10-24 10:52:09 -0600

Seen: 510 times

Last updated: Oct 24 '16