Hi, the server hangs again every 2 / 3 days. Cause it is testing environment, traffic is very low. It is not Vmware environment (as I say before), it is xenserver environment. I install xentools, upgrade to v2RC2 , and change 8 cpus to 1 cpu.
What can I do now? Jaume Ponsa Sistemes i Xarxes Inf. Calidae, S.L. [www.calidae.net] - [email protected] tel +34 938654433 fax +34 938651973 El 08/02/12 14:20, David Martin (IT) escribió: > What type of traffic? I really can't see that 8 vCPUS are needed unless it is > VERY heavy stuff. Even "Enterprise" load-balancers like the F5 BIG-IPs don't > have that kind of CPU firepower until you get to the very high end kit. My > own environment has not grown to that size as of yet as we are still using > the BIG-IPs but we are not predicting anything like 8vCPUs based on current > tests. > > Start with one vCPU, test performance, and increase your CPU resources > accordingly (if required). With VMWare, it is always best to start at the low > end and increase the resources if needed when working with new applications. > The vast majority of our Windows servers, for example, are running with 1vCPU > and 1GB RAM with no difficulty. The big stuff, databases and high end app > servers, are loaded with both memory and CPU, but only after very careful > benchmarking. > > Careful tuning of the VM and the workloads mean you can get away with very > low footprints if you can afford to put the time in. In turn, vMotion, DRS, > HA and all the other clever VMWare magic work more quickly with the smaller > footprint VMs. > > I also agree with Nick, you should get the VMWare tools installed asap as > these provide proper network drivers which will be critical to your success. > > Regards > > David > > > -----Original Message----- > From: Jaume Ponsa [mailto:[email protected]] > Sent: 08 February 2012 12:54 > To: [email protected] > Subject: Re: [Zenloadbalancer-support] question > > I was planning to manage 3 real servers behind ZLB and 600 concurrent > petitions... > > not necessary 8 cpu's? > > When cpu is 100% can't access machine, so can't type "top" > > Jaume Ponsa > > Sistemes i Xarxes Inf. Calidae, S.L. > [www.calidae.net] - [email protected] > tel +34 938654433 fax +34 938651973 > > > El 08/02/12 13:27, David Martin (IT) escribió: >> Is there a performance reason why you have 8 vCPUs assigned to the VM? >> Unless you are planning an absolutely massive load-balance pool that >> can actually use this arrangement you should drop this considerably >> according to VMWare best practice. >> >> My understanding is that, every time you introduce another vCPU, the >> overhead for context-switches, register flushes, synchronisation and >> the like increases considerably, especially when you are spreading the >> vCPUs across different dies. >> >> Unless you have applications that absolutely have to have access to >> the CPU power, you really want to cut the cores to the bare minimum. >> Try starting with 1vCPU and 4GB RAM and work your way up until you >> start to hit performance limits. >> >> Also, when you are seeing 100% CPU usage, what does the output of the >> "Top" command show? >> >> Regards >> >> David >> >> >> -----Original Message----- >> From: Jaume Ponsa [mailto:[email protected]] >> Sent: 08 February 2012 10:28 >> To: '[email protected]' >> Subject: [Zenloadbalancer-support] question >> >> Hello all... I have one testing v2RC1 installation on a vmware virtual >> machine. >> >> I have no more traffic (only tests) and I don't know why, 2 times, >> system hangs ..... the reason is cpu becomes 100% usage and system >> becomes unusable.... can anyone help me pleas? >> >> I don't think will be a hardware problem, because i have other >> machines running perfectly, and for this Zen machine I reserved 4Gb >> RAM and 8 CPU Xeon E5620 >> >> I installed ther kernel 2.6.32-5-686-bigmem to allow more than 4Gb RAM >> (in future I'll assign 16Gb ). May be have to install >> linux-image-2.6.32-5-vserver-686-bigmem kernel??? >> >> Thanks >> >> -- >> Jaume >> >> >> ---------------------------------------------------------------------- >> -- >> ------ >> Keep Your Developer Skills Current with LearnDevNow! >> The most comprehensive online learning library for Microsoft >> developers is just $99.99! Visual Studio, SharePoint, SQL - plus >> HTML5, CSS3, MVC3, Metro Style Apps, more. 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Free future releases when you >> subscribe now! >> http://p.sf.net/sfu/learndevnow-d2d >> _______________________________________________ >> Zenloadbalancer-support mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/zenloadbalancer-support > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers is > just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro > Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Zenloadbalancer-support mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/zenloadbalancer-support > > Johnston Press plc Registered in Scotland no. 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