[unisog] large volume of files per filesystems

Mitch Collinsworth mitch at ccmr.cornell.edu
Fri Dec 21 20:01:24 GMT 2001


On Fri, 21 Dec 2001, Jim Ennis wrote:

> What have other people done to handle the backup of lots of little files
> with a short backup window?  Any preferred (working) solutions that you
> would recommend?

OpenAFS, and IBM AFS from which it OpenAFS came, both snapshot their
volumes first (quickly) and then the backup system backs up the
snapshot copy.

Restores do involve restoring an entire AFS volume, but AFS volumes
can be whatever size you prefer, from a single directory on upwards.
It's not necessary, or even advisable, to put the entire filesystem
into one volume.  If you need to restore a single file, you restore 
the volume it belongs to onto a chunk of disk space, mount the
volume somewhere in the filesystem, and copy the file to wherever
you want it.

AFS is not the one right answer for everything, but it's a good
choice in many cases.  The ability to make coherent backups without
requiring down time is one of its handy features.

-Mitch



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