Hi, i've been asking all around here a while ago. Unfortunately I couldn't continue to work on my cluster, so I'm still thinking about the design. I hope you will help me again with some recommendations, because when the cluster is running changing of the design is not possible anymore.
These are my requirements: - all services are running inside virtual machines (KVM), mostly databases and static/dynamic webpages - I have two nodes and would like to have some vm's running on node A and some on node B during normal operation as a kind of loadbalancing - I'd like to keep the setup simple (if possible) - availability is important, performance not so much (webpages some hundred requests per day, databases some hundred inserts/selects per day) - I'd like to have snapshots of the vm's - live migration of the vm's should be possible - nodes are SLES 11 SP4, vm's are Windows 7 and severable linux distributions (Ubuntu, SLES, OpenSuSE) - setup should be extensible (add further vm's) - I have a shared storage (FC SAN) My ideas/questions: Should I install all vm's in one partition or every vm in a seperate partition ? The advantage of one vm per partition is that I don't need a cluster fs, right ? I read to avoid a cluster fs if possible because it adds further complexity. Below the fs I'd like to have logical volumes because they are easy to expand. Do I need cLVM (I think so) ? Is it an advantage to install the vm's in plain partitions, without a fs ? It would reduce the complexity further because I don't need a fs. Would live migration still be possible ? snapshots: I was playing around with virsh (libvirt) to create snapshots of the vm's. In the end I gave up. virsh explains commands in its help, but when you want to use them you get messages like "not supported yet", although I use libvirt 1.2.11. This is ridiculous. I think I will create my snapshots inside the vm's using lvm. We have a network based backup solution (Legato/EMC) which saves the disks every night. Supplying a snapshot for that I have a consistent backup. The databases are dumped with their respective tools. Thanks in advance. Bernd -- Bernd Lentes Systemadministration institute of developmental genetics Gebäude 35.34 - Raum 208 HelmholtzZentrum München bernd.len...@helmholtz-muenchen.de phone: +49 (0)89 3187 1241 fax: +49 (0)89 3187 2294 Wer Visionen hat soll zum Hausarzt gehen Helmut Schmidt Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Dr. Nikolaus Blum, Dr. Alfons Enhsen Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 _______________________________________________ Users mailing list: Users@clusterlabs.org http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org