Note that I'm cross-posting my response to [EMAIL PROTECTED]; that's a much better list for this subject than LINUX-390.
Dave MYERS wrote:
I am going to be installing 3 different zVM's on the same z990 for 3 different sets of engineer departments.
Shared DASD.
What are the implications of using same VOLID's for 440RES W01 W02 etc. Does zVM detect duplicate VOLSERs (like z/OS) during IPL?
I'd prefer to change these VOL ID's and make them unique for each zVM system...but the z/VM Summary for Installation says I can't do that during the install.
How hard is it to do this after the install...and what are the todo's...
First off, one clarification: the work volumes can have names other than the defaults; this is set during installation easily. So, all you have to worry about is having three copies of 440RES. Given that 440RES is identified to z/VM when you IPL VM, it's not hugely critical; the correct 440RES for the image is the one that was IPL'ed. However, I'm still a proponent of renaming it so all volume IDs are distinct.
It's a little tricky to rename 440RES, but overwhelmingly so. Most of the work is done in USER DIRECT. Keep in mind that the DIRECT statement at the start of USER DIRECT has to match the current label of the volume. You can either not change it until after the IPL, or you can change it and make darned sure you DIRECTXA USER after you relabel the volume and before you re-IPL. (That's my personal blind spot: I've gotten very good at recovering systems which refer to the old volume label!)
There are also references to 440RES in SYSTEM CONFIG -- and remember that you have three copies of SYSTEM CONFIG, on MAINT CF1, CF2, and CF3. I think it's three references in SYSTEM CONFIG: warm start area, check point area, and system owned volumes list. But do a global search in case I've forgotten one.
1. Fix all references in USER DIRECT
2. Fix the references in at least one copy of SYSTEM CONFIG
3. on MAINT, "CPFMTXA 123 newvol LABEL" -- the label parameter is
important! :-)
4. DIRECTXA USER -- new DIRECT statement, new disk label, all is good.
5. write down on paper where minidisk that contains USER DIRECT
starts and for how many cylinders. Also, MAINT 190. You won't need
this, because you did 1-4 in the correct order and they all
worked, but failure to write down these pieces of information will
invoke Murphy's Law.
6. Shutdown your system
7. IPL your system.I presume you'll do this all second-level. It's a lot easier to do this with a test image than to have to repeat the installation process because you managed to say the wrong thing at the wrong time. :-)
Are you running two of the z/VM systems as guests of the third, all three as guests of a fourth, or each in their own LPAR? I'd probably run three as guests of a fourth, but that's just me.
Thanks Dave
Nick ("BTDT") Laflamme
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