On Fri, 31 Aug 2012, Dietmar Maurer wrote:
RBD waits for the data to be on disk on all replicas. It's pretty easy
to relax this to in memory on all replicas, but there's no option for
that right now.
I thought that is dangerous, because you can loose data?
By putting the journal in a tmpfs then data written to the journal does
not hit disk. If all replicas fail data will be lost.
For some use cases that might be ok. For example incremental backups or
fast scratch space or volatile virtual machines etc.
Also see this previous discussion:
http://www.mail-archive.com/ceph-devel@xxxxxxxxxxxxxxx/msg06070.html
--jerker
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