Jim is correct about TCP/IP's expanded use of C. The sidebar to that statement is that the increased virtual storage requirement comes from the use of the C sockets code and the name resolver code in LE and CMS. C sockets are byte file system (BFS) file descriptors. Even if you are not running with or using the BFS, every socket created is a BFS file descriptor. Unfortunately, the BFS control blocks and data areas chew up a lot of virtual storage, ~5M. Since TCP/IP functions such as PING, TRACERTE, and NFS use C sockets now, they need more virtual storage to run.
For other reasons for some of the increased storage use in z/VM 5.1.0 and later CMS, please see the http://www.vm.ibm.com/devpages/donovanm/zvmle.html#LEstor web page. Also, you really want to make sure you have installed CMS APAR VM63819 on both z/VM 5.1.0 and 5.2.0, LE APAR VM63820 on both releases, and TCP/IP APAR PK15940 on z/VM 5.1.0. These APARs correct several out-of-storage related conditions discovered when running PING. Thanks! Mike "Stracka, James (GTI)" <[EMAIL PROTECTED] To .com> [email protected] Sent by: VM/ESA cc and z/VM Discussions Subject <[EMAIL PROTECTED] Re: CMS SIZE .UARK.EDU> 02/13/2006 11:05 AM Please respond to VM/ESA and z/VM Discussions <[EMAIL PROTECTED] .UARK.EDU> This was because of TCP/IP's expanded usage of C. Testing showed doing PING and NETSTAT commands may need up to 5M more. IBM Level-2 suggested going to 32M (as much as 64M is will not expand what was called the page and segment tables). -----Original Message----- From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] On Behalf Of Huegel, Thomas Sent: Monday, February 13, 2006 10:47 AM To: [email protected] Subject: CMS SIZE I have a simple question for anyone that has z/VM 5.2 running. I seem to remember someone saying that the size of CMS machines needs to be increased on 5.2. I am sure the validity of that statement depends on what release one is on before going to 5.2. I am on z/VM 4.3. The book states that the minimum for 4.3 and 5.2 are both 2M to IPL CMS and 20M for IPL 190. Most of my 100+ CMS users are at 8M now. Will 8M suffice or should it be virtualized to 16M? Any opinions? Thanks __________________________________________________________________ << ella for Spam Control >> has removed VSE-List messages and set aside VM-List for me You can use it too - and it's FREE! http://www.ellaforspam.com If you are not an intended recipient of this e-mail, please notify the sender, delete it and do not read, act upon, print, disclose, copy, retain or redistribute it. Click here for important additional terms relating to this e-mail. http://www.ml.com/email_terms/
