On Tue, 2008-09-23 at 20:34 -0700, Daniel Phillips wrote: > On Sunday 21 September 2008 07:31, Tomasz Chmielewski wrote: > > > Writeable snapshot has been available in btrfs for a long time. > > > > Writeable snapshots and snapshot merging are two different things. > > I think what Mikulas really means by "snapshot merging" is what we call > "revert to snapshot" in ddsnap (google Zumastor ddsnap). The latter is > more appropriate terminology IMHO. For a snapshotted volume, this just > requires copying any blocks that belong to the snapshot and not the > origin back to the origin. Similarly, one could revert any snapshot > "back" (quotes because there is not necessarily any relationship in > time) to any other. For a filesystem it will not be nearly so simple, > because at best only part of the job can be done at the physical block > level. It took me a while to get what was meant by snapshot merging. Consider this a vote for the "revert" terminology. :) Although, it calls into question some of my assumptions about what people use snapshots for. What do people use snapshots for? Cheers, Eric
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