-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/25/2012 09:00 PM, Digimer wrote: > Hi all, > > EL6 DLM question. Beginning adventures in DLM tuning... :) > > I am trying to optimize DLM for use on nodes which can hit the > disks hard and fast. Specifically, clustered LVM with many LVs > hosting many VMs where the VMs are simultaneously disk i/o > intensive. I am testing though with bonnie++ to induce a high load > on a GFS2 partition though. Wouldn't it be more useful to test the clustered LVM scenario (e.g. using a block device benchmark tool to simulate VM I/O load)? GFS2 and clvmd use the locking service in quite different ways - in particular I/O on a GFS2 file system involves locking operations but this is not true for clvm volumes unless they use a cluster aware device-mapper target like cmirror. I'd only expect DLM performance to become a consideration here if there were many clustered LVM operations taking place on different nodes at the same time. Regards, Bryn. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk8hYKsACgkQ6YSQoMYUY970NQCeM5ottyaExj1SJTfgaiewYzfl 2PMAniZ1QVv8PWnADJ5/rru+dzy2OWNm =RdiC -----END PGP SIGNATURE----- -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
