Hi Rio Rio schrieb: > it is FAR cheaper to run a few hosts running virtuals than to run real > hardware. the more hardware you run the more you increase your chances of a > hardware failure. although possibly measurable, we have absolutely no > noticable difference in efficiency of services between virtuals and real > hardware. > You quite missed the point. Cost-efficiency and HA never match nor be a difference - they are distinct :-)
Joseph critiziced that virtualisation alone is not the answer to HA - and he is right. The combination of virtualisation _AND_ LVS may be a answer to future quests for HA . We and surely several others run virtualized server-clusters with many virtual servers embedded into one big box. As Joseph states a critical faillure of this box will costs us as much cutomers as we have v-servers on this box :-) _BUT_ we have a second big box which is the realtime mirror of the first one by the virtue of DRBD. So if big box one fails ... to cite Joseph: > If you need failover (do virtual servers fail?) > why not just 5 machines (enough that you'll only loose 20% > on failure)? the second box takes over by the virtue of heartbeat and reboots the mirrored virtual instances. [This is not truly our aproach. We use virtual realservers spread across some big boxes via ipvs wich share some cluster-filespace. This is truely HA] Imagine the future in 2-5 years. A typical server will have 8 to 16 CPU-cores with 2 MHz. Without virtualisation you will ony enlarge the CO2 footprint of you datacenter but you will not be cost-efficient nor you will be more HA than with distinct boxes. I post this not to put oil in the fire, but to promote a fruitful discussion on the benefits of combining virtualisation with LVS. Best regards, Volker -- ==================================================== inqbus it-consulting +49 ( 341 ) 5643800 Dr. Volker Jaenisch http://www.inqbus.de Herloßsohnstr. 12 0 4 1 5 5 Leipzig N O T - F Ä L L E +49 ( 170 ) 3113748 ==================================================== _______________________________________________ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to [EMAIL PROTECTED] or go to http://lists.graemef.net/mailman/listinfo/lvs-users