>>> On 8/4/2013 at 04:34 PM, Paul Gilmartin <[email protected]> wrote: > And here, I'm not up to speed on my jargon. Since I can say, > "CP IPL CMS", does that mean CMS is a NSS? I had always > thought of it as a DCSS.
CMS is indeed an NSS, not a DCSS. >>After that gets saved to spool, any z/VM guest can IPL using that shared NSS. > Only one copy of it will be brought into real storage for any number of > users. >> > "... any number of users"? Or any number of virtual machines? > (May not be the same thing; one z/OS virtual machine may support > "any number" of TSO users.) (FSVO "any".) Any number of virtual machines that IPL that NSS, which in this example would by definition be Linux guests. Any number of CMS guests can IPL CMS and only one copy of the CMS nucleus will be in real storage, etc. Note that in both cases, we're only talking about the kernel/nucleus. Anything else running within that guest will have its own copy of "whatever." Unless you use the xip2fs file system driver to turn a DCSS into a read-only shared file system containing binary executables. Using that technology, you can have multiple instances of applications only taking up the space of one instance. Mark Post Mark Post ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
