[Openstack] Ceph.

Marcus White roastedseaweed.k at gmail.com
Tue Sep 30 21:17:20 UTC 2014


Hello,
Had some basic Ceph questions.

a. Ceph is strongly consistent and different from usual object, does
that mean all metadata also, container and account etc is all
consistent and everything is updated in the path of the client
operation itself, even for a single site? Is it the same for block and
file?

b. If it is strongly consistent, is that the case across sites also?
How can it be performant across geo sites if that is the case? If its
choosing consistency over partitioning and availability...For block, I
read somewhere that it is now eventually consistent(AP vs CP) via DR.
Gets a bit confusing with all the literature out there. If it is DR,
isnt that slightly different from the Swift case?

c. For block, is it CP on a single site and then usual DR to another
site using snapshotting?

d. For block, is it just a linux block device or is it SCSI?


TIA,
MW




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