There are some issues with monitoring linux under VM - the numbers are not quite right, well, they can be absolutely wrong.
Linux does accounting and CPU measurements for processes, etc as if Linux owns 100% of the processor resource. Thus all of your Linux CPU numbers will be inflated. My example that I've presented at SHARE, IBM Tech conferences and assorted other meetings, shows Linux off by 1 order of magnitude. (This includes TOP, other agents, any way you like to measure Linux CPU) If you would like valid linux performance numbers when running on VM, the only solution on the market (i'm pretty darn sure) is ESALPS, from Velocity Software (long time vendor of VM performance products....), and for the last 14 years, Velocity has ALWAYS supported new releases of VM. ESALPS measures Linux servers under VM or rack servers, measures VM, and will report correct numbers for Linux as well as for VM. This includes Linux process data and Linux "system" utilization. ESALPS will also provide a "multiplier" so that you can correct your accounting data. For those trying to monitor many linux images under VM, the 2nd issue is how to turn off your monitoring when the server is idle. If you look at the processor and more important, the storage requirements of an active linux server, you would not want your linux servers to be active just to be monitored. ESALPS also provides the ability to turn off the monitor when there is no other activity. > >From: Jerry Prange <[EMAIL PROTECTED]> >Hello, > >I saw your post in one of the newsgroups re: a monitor for >Linux. I'm currently in the process of searching for a monitor >that gathers cpu statistics for our webservers that run in this >environment. We are using WebSphere 4.x and would like to be >able to gather cpu statistics for billing purposes to our >customers that utilize this platform. There may be several >application servers on a single image. > >Thanks for any feedback that you can provide me. > >Jerry "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/
