Re: cachefs on linux

From: Sean Hunter (
Date: Tue Jun 10 2003 - 03:29:30 EST

On Mon, Jun 09, 2003 at 03:49:36PM -0500, Shawn wrote:
> Well, it's a nice way to simulate writing on r/o filesystems IIRC. Like
> mounting a cdrom then writing to it, but you're not.
> Was that was this was? Anyway, linux also does not have unionFS. If it
> was that big of a deal, someone would write it. As it is, it's a
> whizbang no one cares about enough.

Its particularly handy for fast read-only NFS stuff. We have thousands
of linux hosts and distributing software to all of them is a pain. With
cachefs with NFS as the "back" filesystem, you push to the masters and
the clients get the changes over NFS and then store them in their local
cache so your software distribution nightmare becomes no problem at all.
Clients read off the local disk if they can, but fetch over NFS as
required. You can tune the cache size on all of the client machines so
they can cache more or less of the most recently used NFS junk on its
local disk.

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