Am Freitag, 1. Februar 2008 13:19 schrieb Dejan Muhamedagic: > On Fri, Feb 01, 2008 at 01:12:53PM +0100, Michael Schwartzkopff wrote: > > Am Freitag, 1. Februar 2008 13:02 schrieb Dejan Muhamedagic: > > > Hi, > > > > > > On Fri, Feb 01, 2008 at 11:44:16AM +0100, Michael Schwartzkopff wrote: > > > > Hi, > > > > > > > > we want to offer services on 4 servers. These services should be high > > > > available. All services will have very low usage. > > > > (...) > > > > > Options 2 or 3. Note that you'll probably have higher maintenance > > > costs with option 3 as well as more complex configuration. And > > > lower hardware cost. It's really a matter of preference. I'd > > > probably go with option 2) and reduce the number of nodes if > > > possible. > > > > HA! Even better solution: > > 8 virtual machines on 2 physical servers form one cluster. heartbeat in > > that cluster can monitor application resources. If one physical machine > > dies, no problem. > > Looks like split brain to me ;-) > > > If an application causes trouble: move it onto a machine on the > > other physical machine. Constraints will be complex, but with the > > technique from "floating peers" from the DRBD HOWTO it should be > > possible. > > I must have missed the "floating peers" term. What kind of > technology is that?
See: http://www.linux-ha.org/DRBD/HowTov2 section "Floating peers" at the bottom of the page. > Note that you'll also have a much bigger and slower cluster this > way. Take some time to test it properly, preferably using CTS > with a near real configuration. Yes. A 8-node cluster is quite complex. There should be a separate quorum server. -- Dr. Michael Schwartzkopff MultiNET Services GmbH Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany Tel: +49 - 89 - 45 69 11 0 Fax: +49 - 89 - 45 69 11 21 mob: +49 - 174 - 343 28 75 mail: [EMAIL PROTECTED] web: www.multinet.de Sitz der Gesellschaft: 85630 Grasbrunn Registergericht: Amtsgericht München HRB 114375 Geschäftsführer: Günter Jurgeneit, Hubert Martens --- PGP Fingerprint: F919 3919 FF12 ED5A 2801 DEA6 AA77 57A4 EDD8 979B Skype: misch42 _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
