I would stay away from blanket terms like GFS being slower than NFS or vice versa. Undoubtedly, stat calls "should" perform better on NFS with attribute caching enabled, but I would first go down the route out insure that the iSCSI is pumping out as much io as it should before getting too carried away on blaming GFS. Actually, more info on the setup would make it easier for us to make an educated guess on what could be causing the problem, for instance, what do you mean by "StorageWorks via 2GB Fiber - iSCSI" is that iscsi over a fibre Ethernet device? That alone would be an odd setup. - raf -----Original Message----- From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Robinson Maureira Castillo Sent: Tuesday, July 10, 2007 8:23 AM To: linux clustering Subject: Re: GFS slower than NFS ??? -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Rainer Duffner wrote: > > GFS is supposed to have a smaller overhead, compared to NFS. > However, I'm not sure this pays out in case a maildir-mailstorage is > clustered. In my personal experience using GFS on RHEL4 vs NFS, is that GFS outperforms NFS on a mail system, both using maildir and mbox style mailboxes. The email software we're using is CommuniGate Pro, which doesn't do any locking at filesystem level. Under heavy use, in a 5TB (split on 5 mountpoints) filesystem, we experienced a drop on WIO from ~90% to 60% using maildir, and then to ~45% when we switched to mbox. One important tip with GFS is to disable quota (noquota mount flag) if you don't need it, it saves a good amount of resources. Best regards, Rob. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGk6Rbu+2kmA0sEb4RAvqnAJ4k6ae/Z8mBu18VADxCKD8j1aoyFwCfYzAc IQiVYHZTil8mNLWBnbzu8bI= =uESK -----END PGP SIGNATURE----- -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
