It is not only for consistent between memory and disk. The key point
is to implement the atomicity of an trancation.
That is when an trancation needs to write an object and update the
pglog at the same time, we must make sure the two IO do both or
nether.
With the journal, when osd restore from
On 11/01/2014 00:40, Kyle Bader wrote:
I've been researching what features might be necessary in Ceph to
build multi-site RADOS clusters, whether for purposes of scale or to
meet SLA requirements more stringent than is achievable with a single
datacenter. According to [1], typical
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