> From: Mike Shorkend <[email protected]> > Subject: Re: Running on CP or IFL ? > Is anybody doing that? Running Linux natively in an LPAR? > If yes, why?
There are some applications (*cough* SAP *cough*) that demand every single cycle you can give them and still want more. VM does add a (small) resource overhead. That's the usual reasoning. Another reason is accounts where IBM had spent a lot of time and money convincing the customer that VM was "not strategic" or "going away real soon" and their IBMers (and/or customer execs) don't want to lose significant face by bringing it back. That reason is common in a lot of Asian customers, Japan in particular, although there's a lot of that still perking around in the US customer base too (inexperienced salescritters selling what they get the biggest bonus for, and not understanding what VM is or does, and getting no education about that from anyone). LPAR mode is also common in "just testing" installs -- most sites with z/OS have a play/testing LPAR already defined, and sticking Linux in that "temporarily" can sometimes sneak it in under the radar. Otherwise, Marcy's stating the obvious -- the improvements in manageability and supportability for Linux in a VM environment quickly pay for any extra capacity or licenses needed to run VM. In almost every case, production use of LPAR mode for Linux is a gigantic PITA, and to be avoided if in any way possible. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] 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/
