On Tue, Feb 1 at 10:54, Rahul Deb wrote:
Hello All, I have two questions related to "zfs snapshot -r" 1. When "zfs snapshot -r tank@today" command is issued, does it creates snapshots for all the�descendent file systems at the same moment? I mean to say if the command is issued at 10:20:35 PM, does the creation time of all the snapshots for descendent file systems are same? 2. Say, tank has around 5000 descendent file systems and "zfs snapshot -r tank@today" takes around 10 seconds to complete. If there is a new file systems created under tank within that 10 seconds period, does that snapshot process includes the new file system created within that 10 seconds? OR it will exclude that newly created filesystem? Thanks, -- Rahul
I believe the contract is that the content of all recursive snapshots are consistent with the instant in time at which the snapshot command was executed. Quoting from the ZFS Administration Guide: Recursive ZFS snapshots are created quickly as one atomic operation. The snapshots are created together (all at once) or not created at all. The benefit of such an operation is that the snapshot data is always taken at one consistent time, even across descendent file systems. Therefore, in #2 above, the snapshot wouldn't include the new file in the descendent file system, because it was created after the moment in time when the snapshot was initiated. In #1 above, I would guess the snapshot time is the time of the initial command across all filesystems in the tree, even if it takes 10 seconds to actually complete the command. However, I have no such system where I can prove this guess as correct or not. --eric -- Eric D. Mudama edmud...@mail.bounceswoosh.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
