On Sun, Jan 06, 2008 at 08:05:56AM -0800, sudarshan sridhar wrote:
> My exact doubt is, if COW is default behavior of ZFS then does COWd
> data written to the same physical drive where the filesystem
> resides?
Just to clarify: there is no way to disable COW in ZFS.
> If so the physical
sudarshan sridhar wrote:
> /Hi,/
> //
> / >>Also where exactly COWed data written
> /
> >>>I'm not quite sure what you're asking here. Data, whether newly
> written or >>>copy-on-write, goes to a newly allocated block, which
> may reside on any >>>vdev, and will be spread across devices if using
sudarshan sridhar wrote:
>> I'm not quite sure what you're asking here. Data, whether newly written or
>> copy-on-write, goes to a newly allocated block, which may reside on any
>> vdev, and will be spread across devices if using RAID.
> My exact doubt is, if COW is default behavior of ZFS then
> Does copy-on-write happen every time when any data block of ZFS is getting
> modified?
Yes. (Data block or meta-data block, with the sole exception of the set of
überblocks.)
> Also where exactly COWed data written
I'm not quite sure what you're asking here. Data, whether newly written or
