Need suggestions for using ceph as reliable block storage

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Hi
We are building our private cloud. We have decided to use ceph to provide features like ebs. How can we make it transparent for vms when one ceph node goes down. Because when one ceph node goes down we will lose a set of osds and thereby set of pgs have to be recovered. Clients' read and write might fail till crush map is updated and recovery process accepts same state of objects. This hangs writes and reads on vms. How can we make it transparent to vms.

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