Hi, I am planning to monitor performance metrics of Dom0 and DomUs (CPU ,Memory,Disk I/O ,Netowrk I/O) .....and define benmchmarks/thresholds to allocate resources accoring to the performance metrics.I am using xm top and Xenmon to collect these metrics. 1)Any suggestions as to how i should go about defing these metrics.? The metrics given out by Xenmon are a bit unclear.Could anyone give some link which describes these parameters. 2)And are there performance thresholds defined for virtualized enviroment like Xen. Any updates on the follwoing post would be helpful. Thanks.......... Henning Sprang wrote: > Hi, > Apart from normal service availability and quality monitoring and > measuring of ressources on a system as it would be done for any normal > machine, I think about additionally monitoring Xen-specific data and > creating one/some Nagios plugins for this. > > So one idea is that I want to know when cpu, net and disk I/O on a Xen > host are saturated, which could, depending on specific needs and > SLA's, make it necessary to add ressources to the host or migrate VM's > to other hosts on which these ressources aren't saturatd yet, or > aother measures. > > While, as far as I understand it, CPU scheduling and traffic shaping > are highly useful to set rules to allocate a given share of the > available ressources to specific vm's, and set minimal and maximal > amounts of these shares, in some cases it might be desirable to get > more information, and be warned. > > As a result of this, I started to analyze (with a nagios plugin) > different sources of xen runtime data, beginning with the output of > xentop -b -i 2, and will mgo on to look deeper into libxenstats, > XenMon and xenoprof(of which I am not yet sure if it's good for > analyzing production runtime data, or if it's more the kind of > profiling one does in non-production environments). > Getting CPU share and seeing when the CPU is fully loaded is no great > deal. > Getting useful information of net and disk I/O saturation requires a > lot of math and measuring (what's the maximum possible net/disk I/O on > that machine, under the given configuration? ) - they both are > depending on overall hardware, cpu scheduling and a lot of other > factors - I am really not sure if this is worth the trouble. > > I am at the same time working on implementations and looking at > information and publications on that topic, like multiple papers on > XenMon available, and so on. > > Did anybody else think about this, or anybody has comments if this is > the right direction to think or better/concrete data to collect and > look at? > > Henning >