On Mon, 19 Dec 2005 09:56:37 +0100, R.S. wrote: >Tom Schmidt wrote: > >> On Sun, 18 Dec 2005 14:54:15 +0100, R.S. wrote: >>>John S. Giltner, Jr. wrote: >>>[...] >>> >>>>Mostly Linux on the MF was so that you could migrate what was on 10, 20, >>>>200 Intel boxes that were sitting there 90% idle and put on a single box >>>>and share CPU and Memeory resources. >>> >>>IMHO this is marketing mantra from IBM. >>>1. Sharing memory resource is not true. Memory can be easily >>>reconfigured (taken from system A to system B), but, assuming 24x7 >>>availability it is big advantage. >> >> >> 1a) Sharing memory resource IS true if you are using z/VM, as the site >> where I'm backup VM-guy is doing with its mainframe Linux workloads. >> They have 24x7 (well, closer to 24x6.98 with periodic scheduled outages >> for non-VM reasons). If it was important to the business to be fully up >> at 5am on every Sunday morning they could achieve 24x7 but it is more >> important to the business that it spend that money elsewhere. > >Does it mean, the system takes memory from common pool when needed ? >Or you can configure some memory offline from one system and assign it >to another, everything without any IPL of any system (mean Linux image) ? >My humble opinion is that you can reconfigure memory between Linux >virtual machines but only when these machines are down. Maybe I'm wrong >with that.
You're wrong with that. VM's virtual memory implementation shares among all of its Linux parasites ALL of the time. The LPAR memory is owned by VM and a subset of that is available to the pool of Linux systems. The size of the subset varies, based on many factors but it is generally a healthy number - plenty for our purposes. One thing for you to consider, R.S., is that Poland is approximately the size of Wisconsin. Our usage extends beyond our borders - worldwide, actually. Because of the reach across many timezones we are more likely to see substantial variability in usage from Linux instance to Linux instance. If you only work within one timezone you might not find the same opportunities. -- Tom Schmidt Madison, WI ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
