Hello,
I noticed some strange (and frightening) behaviour from ASM after a series of Pagedel and Pageadd commands. For demonstration purposes I IPLed this system with PAGTOTL=8 and 4 Locals. Together with the PLPA, Common and reserved Duplex slot, this leaves 1 available slot for a Local. CMF's ASM command shows the individual slots and shows that the last slot is empty. D ASM IEE200I 09.59.47 DISPLAY ASM 434 TYPE FULL STAT DEV DATASET NAME PLPA 41% OK D312 SYSL.PAGE.PLPA1 COMMON 14% OK D312 SYSL.PAGE.COMMON1 LOCAL 19% OK D312 SYSL.PAGE.LOCAL1A LOCAL 19% OK D312 SYSL.PAGE.LOCAL1B LOCAL 19% OK D325 SYSL.PAGE.LOCAL2A LOCAL 19% OK D325 SYSL.PAGE.LOCAL2B **ASM BBDDI026I ASM AMTA5CI Last IPL was Cold Start (CLPA) 441 AMTA51I ASMVT 00FE1AB8 AMTA52I Total local slots= 3,367,436 Available= 2,710,446 (80%) AMTA5DI Largest holder of slots is KLTJBEG1 with 3.5% AMTA53I D/S 0 (D312 LSYSP1) PLPA Size= 35,999 (58% Free) Burst= 3 AMTA53I D/S 1 (D312 LSYSP1) COMN Size= 72,179 (85% Free) Burst= 3 AMTA56I D/S 2 (not in use ) AMTA53I D/S 3 (D312 LSYSP1) LOCAL Size= 841,859 (80% Free) Burst= 3 AMTA53I D/S 4 (D312 LSYSP1) LOCAL Size= 841,859 (80% Free) Burst= 3 AMTA53I D/S 5 (D325 LSYSP2) LOCAL Size= 841,859 (80% Free) Burst= 3 AMTA53I D/S 6 (D325 LSYSP2) LOCAL Size= 841,859 (80% Free) Burst= 3 AMTA56I D/S 7 (not in use ) When I do a Pageadd of a new pagedataset, it occupies the last slot and is initially for 0% used. Nothing strange so far, all working according to 'the book'. Then I decided to help ASM a little to fill the new Local and lower the utilization of the other Locals. I did a Pagedel of 1 Local and after some 10 minutes the Local was empty and removed from the list. CMF's ASM shows that its slot is free. Then I did a Pageadd of the same Local and it is made 'available for system use', but it appears to be *19%* full. This is the percentage that it was before I removed it. CMF's ASM shows that it occupies its old slot, since this is the only available slot. Then I did a Pagedel again and in a few seconds it was empty and removed. Apparently not many frames needed to be moved out. I did a more complicated scenario: Pagedel 2 Locals and Pageadd them in reverse order. Both are again 19% full but swapped their slots. What is happening here? Is it only the percentage full that is in error? Or is ASM's administration in error, thinking there are pageframes in that Local that are not really there? Looking at the speed of the second Pagedel, there are not many frames that need to be moved from it, so this suggests that ASM's administration is correct. Anyone seen this before and can explain what is happening? I see it under both z/OS 1.8 and 1.10. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
