> From: Richard Elling [mailto:richard.ell...@gmail.com] > Sent: Saturday, April 24, 2010 10:43 AM > > > Nope. That discussion seems to be concluded now. And the netapp > does not > > have the problem that was suspected. > > I do not recall reaching that conclusion. I think the definition of > the problem > is what you continue to miss. > > > The .snapshot directories do precisely what you would want them to > do. > > Which is: The .snapshot directory belonging to a parent contains a > copy of > > the filesystem as it looked at the time of the snapshot. But when > you mv or > > rename a subdirectory, then the .snapshot subdir of the subdirectory > > correctly maps, to preserve the snapshots inside that directory. > > Agree, but the path is lost.
In the original test, done by Jonathan, it seemed that way. But after two other people responded with their own repeats of that test, which concluded with no problems, Jonathan retried his, and found that he just needs to repeat the same "ls" command twice to get the proper result on the 2nd try. He is running a very old version of Ontap, so most likely he's just seeing the result of some bug. But others don't have that issue. The path is not lost. The following all work just fine: a/.snapshot/vol0_deleteme/b/c/d.txt or a/e/.snapshot/vol0_deleteme/c/d.txt a/e/c/.snapshot/vol0_deleteme/d.txt > It seems, the NetApp snapshot is a directory-level snapshot rather than > a > file system snapshot. I cannot see how to merge the two, so perhaps > adding such a feature to ZFS could not leverage the file system > snapshot? Again, in Jonathan's original post, that's what it seemed like. But after Adam and Tom replied showing they didn't have the same behavior ... Jonathan reran his test, and got a different result. Which concluded: The .snapshot directory does indeed maintain a filesystem-level snapshot of the whole filesystem, but it also provides an easy-to-access interface within any subdirectory, even after renaming a directory. It works. Although Jonathan apparently saw a problem in an old version of the OS. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
