-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Johnny Luo Sent: Wednesday, August 22, 2007 9:27 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: LPA Module Size 80MB impact on system?
Thanks for the answer, Wayne. I remember that if a module comes from an APF lib and with RENT attribute, it'll be loaded into SP 252 of JPA. Since SP 252 is key 0, a modification to itself may fail unless you're in key 0. However, as far as LPA is concerned, is it protected using another mechanism? So even you're running in key 0, you still cannot modify LPA. So the module in LPA should be also refreshable. <SNIP> As best as my memory is working this morning, going back to hardware days: The protection for LPA is that it is written once (LPA PAGE DS) and then fetched as needed. So, if a page gets corrupted, which in this case would show that the page frame has been written to, the page is flushed and re-read from the LPA page data set. This also allows the system to recover from a memory parity error (where the page frame gets marked as unusable). This last being a trick that I wonder if the M/S systems have learned yet (oh, they don't have ECC dual parity memory)? Later, Steve Thompson Opinions expressed are those of the poster and not necessarily those of poster's employer. -- This e-mail message is intended only for the addressee(s) and contains information that may be confidential and/or privileged material. If you are not the intended recipient please notify the sender by reply e-mail immediately. Use, disclosure or reproduction of any information in this e-mail by anyone other than the intended recipient(s) is strictly prohibited. Sterling Commerce is not liable for any loss or damage arising in any way from transmission of the message or use of its attachments. This email may contain links to third party web sites. Sterling Commerce is not responsible for the content or privacy policies of such other sites and the existence of a link in this email does not imply an endorsement of the linked web site or the goods or services offered therein. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
