"Barbara Nitz" <nitz-...@gmx.net> wrote in message news:<9197539290910617.wa.nitzibmgmx....@bama.ua.edu>... > >To be precise: ASM reserves 2 exposures *per pagedataset* not per > >volume (i.e. 2n-1 Aliasses per volume), since/so you can allocate more > >than 1 pagedataset on one volume. We do so to fill 3390-9s and -27s with > >pagedatasets. > > I beg to disagree. :-) HiperPAV works on a per-IO-basis in the hardware, so ASM cannot 'reserve' an exposure (anymore). HiperPAV is for faster I/O turnaround and for reduction of IOS queuing times by giving another SSCH another 'exposure'. No SSCH, no HiperPAV usage. If no I/O is started because ASM knows there is one outstanding (as was the case in the past) then HiperPAV is effectively not used. Other than for the second case that Jim Mulder had detailed in the past. Hence my question if that is still true or if ASM now starts as many IOs as needed to get paging requests filled. > > Barbara >
Diagrement permitted. I was referring to the pre-hiperpav ASM algorithmes, where it ensured that PAVS guaranteed 2 I/Os to each pagedataset. 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 lists...@bama.ua.edu with the message: INFO IBM-MAIN