Brent A Nelson wrote:
On Mon, 12 Jan 2009, Gordan Bobic wrote:
Brent A Nelson wrote:
I believe you're looking for shared writable mmap support, which
requires a very recent (maybe) or painfully-patched FUSE; it's not
really up to GlusterFS (I think it will probably just work, if your
FUSE is somehow able to support it).
I was actually more thinking about an option to rpm/bdb to make it no
use mmap.
I don't know for rpm; apt-get certainly did not have any such option,
although someone did create a patch to disable it in apt-get.
BDB seemingly has such options, but I haven't managed to get them to
work. Putting the mmap disabling flag in /var/lib/rpm/DB_CONFIG did
nothing. :(
So, if you can't get shared writable mmap to work, try the workaround
with tmpfs or another filesystem (perhaps even an NFS mount of a
GlusterFS directory).
Would that actually work? Exporting /var/lib/rpm via NFS and mounting
it to fake some kind of mmap support? It's an inspired solution, I'll
grant you that. I'll have to try it. :-)
tmpfs certainly worked in my case, and others claimed that NFS in
general would work.
The with the tmpfs solution is that it requires extra work to keep the
rpm DBs in sync. Not ideal.
NFS to a filesystem that doesn't itself support
shared writable mmap (such as GlusterFS or any other FUSE filesystem)?
Well, we probably won't know for sure until you try it. ;-)
Well, I'm trying to get it working at the moment, but when I'm exporting
it from glusterfs I get:
mountd: Cannot export /var/lib/rpm, possibly unsupported filesystem or
fsid= required
I am using the fuse stuff from here:
http://ftp.gluster.com/pub/gluster/glusterfs/fuse/fuse-2.7.3-2.src.rpm
Am I missing something?
Gordan
