On Wed, Oct 2, 2013 at 05:23:31PM +0300, Oskari Saarenmaa wrote: > On 02/10/13 17:18, Andrew Dunstan wrote: > > > >On 10/01/2013 06:31 PM, Oskari Saarenmaa wrote: > >>Add file cloning as an alternative data transfer method to pg_upgrade. > >>Currently only btrfs is supported, but copy-on-write cloning is also > >>available on at least ZFS. Cloning must be requested explicitly and if > >>it isn't supported by the operating system or filesystem a fatal error > >>is thrown. > >> > > > >So, just curious, why isn't ZFS supported? It's what I am more > >interested in, at least. > > No fundamental reason; I'm hoping ZFS will be supported in addition > to btrfs, but I don't have any systems with ZFS filesystems at the > moment so I haven't been able to test it or find out the mechanisms > ZFS uses for cloning. On btrfs cloning is implemented with a custom > btrfs-specific ioctl, ZFS probably has something similar which would > be pretty easy to add on top of this patch. > > Added this patch to commitfest as suggested, > https://commitfest.postgresql.org/action/patch_view?id=1251
What is the performance overhead of using a cloned data directory for a cluster? -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
