On 06/11/2010 06:40 PM, Sage Weil wrote:
The btrfs isn't required for consistency if the writeahead journal is enabled (which it is by default). However, at the moment the code that controls trimming the journal assumes ext3 data=ordered fsync semantics (fsync flushes the entire journal and all prior writes). This needs a little bit of work to do the right thing with ext4 and xfs. So: I would stick with btrfs or ext3 for now if you want recovery to work reliably!
The recovery you are referring to, here, is that an operation required... a) after an outage that involved many/all redundant OSDs b) after a physical failure of one underlying storage device c) after every disconnect/reconnect of Ceph nodes ? Regards, Peter Niemayer -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
