Hello folks, 2008/8/14 Daniel Phillips <phillips@xxxxxxxxx>: > On Monday 11 August 2008 16:34, FUJITA Tomonori wrote: >> On Mon, 11 Aug 2008 18:12:08 -0400 (EDT) Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: >> > So use different format --- we in RedHat plan redesigning it too. One of >> > the needed features is "rolling snapshots" --- i.e. you take snapshot > > Matt Dillon's Hammer for BSD has rolling snapshots, effectively > infinite snapshots on a per-fsync basis. I strongly suggest that you > think about rustling up some engineers to join a porting team, both > Red Hat and NTT. I'm a developer of NILFS, a Linux log-structured filesystem with the rolling snapshots (we call it continous snapshots); NILFS can take inifinite snapshots every few seconds or on a per-fsync basis. ( It is available from http://www.nilfs.org/ ) Though it works fine and is maintained for the recent kernels, it's too complicated due to its LFS nature (as Tomonori pointed out). So, I am happy if we can realize continuous snapshotting filesystem much simpler on nicely supported dm or block layer features. We also have to keep in mind that filesystem development requires much more energy than usual projects. It seems that a lot of development energy is dispersed around filesystems especially for Linux. I'm still working on NILFS to make it simple enough, but I am also glad to cooperate with other engineers if other FS people or Red Hat people hope for that. With regards, Ryusuke Konishi -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
