Musings on ZFS Backup strategies

David Magda dmagda at
Sat Mar 2 01:12:05 UTC 2013

On Mar 1, 2013, at 12:55, Volodymyr Kostyrko wrote:

> Yes, I'm working with backups the same way, I wrote a simple script that synchronizes two filesystems between distant servers. I also use the same script to synchronize bushy filesystems (with hundred thousands of files) where rsync produces a too big load for synchronizing.

There are quite a few scripts out there:

For file level copying, where you don't want to walk the entire tree, here is the "zfs diff" command:

> zfs diff [-FHt] snapshot [snapshot|filesystem]
> 	 Describes differences between a snapshot and a successor dataset. The
> 	 successor dataset can be a later snapshot or the current filesystem.
> 	 The changed files are displayed including the change type. The change
> 	 type is displayed useing a single character. If a file or directory
> 	 was renamed, the old and the new names are displayed.

This allows one to get a quick list of files and directories, then use tar/rsync/cp/etc. to do the actual copy (where the destination does not have to be ZFS: e.g., NFS, ext4, Lustre, HDFS, etc.).

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