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
/ Oskari