Yang Zhang <yanghatespam@xxxxxxxxx> writes: > My question really boils down to: if we're interested in using COW > snapshotting (a common feature of modern filesystems and hosting > environments), would we necessarily need to ensure the data and > pg_xlog are on the same snapshotted volume? Yeah, I think so. It's possible to imagine schemes that would let a WAL-snapshot-shortly-after-the-data-snapshot work, but you would (at least) need to disable WAL file recycling, which there's no provision for at the moment. The usual approach is to use a COW snapshot only for making a base backup of the data area, and rely on WAL streaming/archiving to copy the WAL. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
