Hi Alyce: If you are new to VM I would also suggest using 2nd level VM for testing, using the 1 cyl offset and G class user. This is a very safe environment, easy to create and so easy to get R/O access to any data on first level as Chris pointed out.
It's also very good to have an Emergency or DR VM system to IPL natively as others have mentioned. My 1 3390-3 volume DR system has a small page and spool space and a very small directory. It also hosts my DR recovery files needed to automatically recover the minimum (4-6 volume) VM floor system needed to IPL. I always hated entering DDR commands at the HMC especially under pressure. It's a lot easier and faster to use VM and REXX to run multiple DDR restores using your DR VM system. Hans _____ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Kris Buelens Sent: October 18, 2007 5:41 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: 2nd Level IPL With secondlevel systems it is also much easier to copy things from firstlevel to secondlevel. For example (supposing you install CPHOST from VM's download lib): CP1 LINK someone 191 1111 RR ATT 1111 * R/O ACCESS 1111 Z And there you have (in R/O mode) all files of minidisk "someone 191" at your fingertips. Additionally (and not less important): you IPL a secondlevel system at your desk, using any 3270 session that connects to the firstlevel VM system. 2007/10/18, Rob van der Heij <[EMAIL PROTECTED]>: On 10/17/07, Austin, Alyce (CIV) <[EMAIL PROTECTED]> wrote: > I assume I could also bring my "new" system up lst level > rather than 2nd level since I have an additional LPAR available; or, do > I have to bring it up 2nd level first (with the new volumes attached) > and then bring it up lst level? The big advantage is about isolating your test from production. Unless you are doing very strict access lists in the LPAR profile, your 2nd LPAR will have access to the same volumes are the primary VM system. If you miss one of the changes in your system configuration file or make another mistake, you may crash your primary VM system. For most things, the class G virtual machine isolates you from the real stuff and is a safe place to try things. And there's no risk you pick the wrong LPAR on the HMC or so. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/ -- Kris Buelens, IBM Belgium, VM customer support
