My experience too. A lot of monitoring is done with dedicated servers in mind. So CPU resources are allowed to be wasted and one doesn't care about keeping the machine active. The same scripts are then used in virtual environments and then they wonder why they get the wrong numbers, why there are performance problems (or seemds to be performance problems), etc. Obviously the CPU load, IO and such depend on how often you run the script.
Look at what you need to monitor. CPU numbers within the guest can be wrong. We have two guests hardlimitted on an absolute share of 11%. Every day they create alerts for high CPU loads within the guest. While they only are limitted in VM because of the share. So monitoring in the guest can give you alerts for the wrong event. If you want to monitor the guest for high user CPU chances are the guest is also running high CPU load in VM too. If you use the appldata and/or mon_procd services in linux you can monitor also usercpu from VM. The CP MONITOR holds the numbers, use a rexx to obtain them. Regards, Berry. -----Original Message----- From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Shane Sent: donderdag 9 december 2010 12:22 To: LINUX-390@VM.MARIST.EDU Subject: Re: Need a little help with a Linux script On Thu, 9 Dec 2010 09:57:55 +0100 Agblad Tore wrote: > I would say: don't use script for monitoring cpu. > You may not get the correct cpu figures from inside the Linux and > these cmds in scripts consumes huge cpu and I/O !! I can't see where parsing the output from mpstat would universally qualify for this admonition. Your bad experience is yours, not everyone elses. > Do it in z/VM and a nice Rexx instead, much better ! This may well be true for something like overall CPU usage of the entire guest - bit hard to determine userspace usage from the hipervisor though. Probably also presumes the availability of a monitor product of some sort on z/VM. Shane ... ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
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