[PLUG] dump & restore

Steve Bonds 1s7k8uhcd001 at sneakemail.com
Sun Jun 13 17:40:02 UTC 2004


On Sun, 13 Jun 2004, Elliott Mitchell ehem-at-m5p.com |PDX Linux| wrote:

> The thought that occurs is; could a journaling filesystem simply
> implement a journal-only mode where all changes go to the journal,
> resulting in a dumpable snapshot without needing LVM or another layer?

Keep in mind that in a journaling filesystem, only the filesystem metadata
(inode entries, data pointers, etc.) are journalled-- the actual data in
the files is not.  (There may be some exeptions for very small changes,
depending on which journaling filesystem is in use.)

The Veritas filesystem has a snapshot mode that does what you describe for
both the data and the filesystem metadata, without regard for which LVM is
in use.

  -- Steve




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