All very good points. We do have a good monitor we just need to learn how to use it and what to look for. It will just take time.
Thanks to all for the input it has been very helpful! Thanks, Nick -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Mark Post Sent: Thursday, March 20, 2008 12:29 AM To: [email protected] Subject: Re: Number of IFLs to zLinux guests >>> On Wed, Mar 19, 2008 at 3:20 PM, in message <[EMAIL PROTECTED]>, "Harris, Nick J." <[EMAIL PROTECTED]> wrote: > Hello All, > > Is there a golden rule about the number of IFLs to support production > Linux guests? No. > I understand all shops are different and 'it depends' > applies...but we are curious as to the ratio of IFLs to Linux guest in > other shops. The question that comes to my mind is "why would you care?" My reaction is that you're trying to manage performance and capacity by gut feel and rules of thumb. If so, that's a good way to ensure failure at some point. You need the proper tools to monitor both and make rational, fact-based decisions. > Are there any shops out there running zLinux guests in production under > z/VM with two or less IFLs besides us? > > We have four production Linux guests and twenty one test Linux guests > supported by two IFLs on a z9BC. If you are experiencing bad performance, you may nor may not need to add capacity, which is where having a good monitor can help you be sure. If you're having good performance, for all you know you could put several hundred guests on those two IFLs. Or, maybe the next test system will crater you. If you don't have good measurements, all the rules of thumb in the world won't help you. Mark Post
