Mark, >From the IBM Presentations the biggest boost would be that one HSM address space (HSMA) is the main that runs only RECALLS. Then an aux (HSMB) could run PSM or SSM, then another aux could run DUMP/BACKUP.
Then each HSM could be in a different WLM class. This could offload the work as well as the priority processing. The three HSM address spaces (HSMA, HSMB and HSMC) all share the xCDS, Journal, and CRQ. They have separate PDA and LOGs Other than memory, system resources, it appears this might be an acceptable setup if you are having issues with recalls, or want to separate out the functions of HSM under different WLM classes. Some documentation is found in Glen Wilcox's HSM presentation from Share. Also in the DFHSM Primer. I am working on a conversion doc that IBM is helping with. There is not a lot of detail in the manuals/presentations. And as always, no tables to show the HSM parms and the various environments. Lizette > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Mark Jacobs > Sent: Wednesday, May 23, 2012 4:17 AM > To: [email protected] > Subject: Re: Anyone using MASH (Multiple Address Space HSM) > > Can I ask under what situations would that be appropriate? > > Mark Jacobs > > On 05/22/12 18:21, Lizette Koehler wrote: > > Thanks Allan, but that is not what I was asking about. > > > > In an HSMPlex you can setup what is called MASH (Multiple Address Space HSM). > This is where one LPAR can have upto 39 DFHSM address spaces running all doing > different functions. The MAIN is doing RECALLS but the others can be doing other > functions. > > > > I am curious to know if any other shop has actually setup the MASH and what issues > they might have come across. > > > > Lizette > > > > > > > > -----Original Message----- > > > >> From: "Staller, Allan"<[email protected]> > >> > >> Look in the Setting up a SYSPLEX manual. It will talk about HSMplex's > >> etc. Should be helpful. > >> I am running a single HSMplex at this time. > >> > >> The only gotcha I recall is be careful with any ADDVOL commands for > >> non-SMS managed volumes. > >> > >> HTH, > >> > >> > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, send > > email to [email protected] with the message: INFO IBM-MAIN > > > > > > > -- > Mark Jacobs > Time Customer Service > Tampa, FL > ---- > > The Doctor: You know when grown-ups tell you everything's going to be fine, and you > think they're probably lying to make you feel better? > Young Amy: Yes. > The Doctor: Everything's going to be fine. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
