How about a simple example: Lets say that I want to add 10 3390-3's as page space to my zVM system. I login as MAINT and issue the CPFMTXA command to format the first volume. The MAINT userid is now tied up for 5+ minutes while the volume is formatting. Plus I can only do one volume at a time. Now, I can simulate multitasking by logging on as 10 different MAINT users (assuming they are already defined in the user directory and ESM) and have each one format a volume.
Contrast this scenario to Linux where I can issue the same command 10 times and simply send all of the processes to the background without tying up my userid/interactive session, and all of the volumes are formatted simultaneously. Several other examples: The REXEC server uses secondary virtual machines (agents) to execute commands passed from each ANONYMOUS or GUEST client. This allows the REXEC server to better service multiple REXEC requests, as the multiple agents accessible to the REXEC server help simulate a multitasking environment. DIRMAINT has its DATAMOVE service machine. IBM Operations Manager uses multiple "worker machines" to propagate work. -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Dave Jones Sent: Thursday, October 11, 2007 2:21 PM To: [email protected] Subject: Re: Linux guest to manage zVM? While CMS is certainly a single user o/s, it as also certainly a multitasking and multiprocessing one as well. And it comes with a very nice set of tools for building very efficient, high performance multitaskings applications (see, e.g., the RSK). I believe the original poster claimed, incorrectly, that since CMS is single user, it must not support multitasking. Mark Post wrote: >>>> On Thu, Oct 11, 2007 at 1:56 PM, in message > <[EMAIL PROTECTED]>, > Coffin Michael C <[EMAIL PROTECTED]> wrote: >> So let's see, Linux is a multi-tasking OS and it runs several >> "processes" simultaneously. >> >> VM is a multi-tasking OS and it runs several "processes" >> simultaneously, only they are independent "virtual machines" running a shared CMS NSS. > > CP is, but CMS is not. The comparison wasn't with CP. > > > Mark Post > > ---------------------------------------------------------------------- > 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 -- DJ V/Soft ---------------------------------------------------------------------- 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 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
