DragonFly users List (threaded) for 2005-02
Re: UFS2 support?
Christopher Weimann <cweimann@xxxxxxxxx> wrote:
> Snapshots are a big deal to me personally. Specifically I have an nfs
> server with millions of files on it. Doing a full dump takes about 12
> hours and a restore takes several days. This is dump is taking place
> over gigabit ethernet to another server with a jumbo drive array and
> isn't being limited by the network.
> With ufs2 and snapshots I expect to be able to just dd the snapshot in
> no time flat but I haven't tried it yet.
Note that dd(8) probably works slower on a snapshot than on
a normal device, because the read access is not completely
sequential. It is also worth noting that dump(8) now has a
-C option in FreeBSD 5, which tells dump that the filesystem
is read-only (which is the case with snapshots) and that it
is OK to cache blocks freely. That improves performance of
By the way, snapshots don't require UFS2.