The 1st 32gig are reserved for JVM then comes 288G-32G for a System area. Then the user areas What is the System area used for ? Any ideas ?
Gunter Hochreiter From: Walt Farrell <[email protected]> To: [email protected] Date: 12/09/2010 01:26 PM Subject: Re: z/OS IARV64 Sent by: IBM Mainframe Assembler List <[email protected]> On Thu, 9 Dec 2010 12:22:53 -0500, John P. Baker <[email protected]> wrote: >32G thru 288G-1 is available for private memory objects, but only if >LOCALSYSAREA=YES is coded (new for z/OS V1R12); question: is this storage >unconditionally available for private memory objects on releases prior to >z/OS V1R12? As far as I know, yes. New functions in z/OS R12 required reserving some space for system functions, and the VSM designers chose that previously unreserved 256GB chunk of storage addresses for that purpose. -- Walt Farrell IBM STSM, z/OS Security Design ----------------------------------------- The information contained in this communication (including any attachments hereto) is confidential and is intended solely for the personal and confidential use of the individual or entity to whom it is addressed. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this communication in error and that any review, dissemination, copying, or unauthorized use of this information, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail, and delete the original message. Thank you
