Scott, Be careful. The actual number of OE on a channel is highly dependent on response time and arrival, and response time is influenced by MP busy on the Host Channel Adapter. Further, the DS8300 FICON HCA write rate is half the read rate, which in turns is less than the capacity of two channels.
There's a reason why IBM recommend only one 4Gb FICON channel per HCA on the DS8300. A very high sustained page out rate to many locals on four channels may not be desirable. And please no-one remind me I work for HDS: I already know it. The information above comes from IBM. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > Scott Rowe > Sent: Wednesday, January 20, 2010 12:20 PM > To: [email protected] > Subject: Re: [IBM-MAIN] PAGE datasets -- few large or more small > > I have a similar configuration, and I use four mod-50 volumes (55650 cyls). > For each LPAR I have four page datasets on each volume, for a total of 16 page > datasets per LPAR (3 LPARS). Because of PAV and multiple allegiance, the ASM > on each LPAR can read/write to 16 page datasets simultaneously. This handles > heavy page-out activity pretty well. > > >>> Don Williams <[email protected]> 1/20/2010 1:39 PM >>> > Another question on page data set sizes... > > > > We only have 1 DS8000 controller. All volumes are raid 5 and metro mirrored > to a second off-site DS8000 controller. > > Which configuration is most likely to have the best performance? > > Which configuration is most likely to have the best RAS? > > > > 1. A few large paging volumes (mod-9 or bigger), each with a single > page data set. > > 2. A lot of small paging volumes (mod-3 or smaller) each with a single > page data set. > > 3. Something in between. > > > > Don > > > > Faith is taking the first step, even when you don't see the whole staircase. > > > -- Martin Luther King Jr. > > > > > ---------------------------------------------------------------------- > 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 > > > > CONFIDENTIALITY/EMAIL NOTICE: The material in this transmission contains > confidential and privileged information intended only for the addressee. If > you are not the intended recipient, please be advised that you have received > this material in error and that any forwarding, copying, printing, > distribution, use or disclosure of the material is strictly prohibited. If > you have received this material in error, please (i) do not read it, (ii) > reply to the sender that you received the message in error, and (iii) erase or > destroy the material. Emails are not secure and can be intercepted, amended, > lost or destroyed, or contain viruses. You are deemed to have accepted these > risks if you communicate with us by email. Thank you. > > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
