> ... slight-of-hand ...
It's _sleight_ of hand. > Date: Sun, 4 Jul 2010 10:30:42 -0400 > From: l...@garlic.com > Subject: Re: Unix systems and Serialization mechanism > To: IBM-MAIN@bama.ua.edu > > wfarr...@us.ibm.com (Walt Farrell) writes: > > If you consider ENQs such as the one ISPF created to protect updating > > members of a partitioned data set, and that some other programs also use, > > that ENQ is more obviously advisory. > > re: > http://www.garlic.com/~lynn/2010k.html#38 Unix systems and Serialization > mechanism > > in that sense, ACP controller lock were advisory ... old email > http://www.garlic.com/~lynn/2008i.html#email800325 > in this post > http://www.garlic.com/~lynn/2008i.html#39 American Airlines > > i.e. channel programs on loosely-coupled could execute w/o requiring > locks ... but "LOCK READ CCW" and "WRITE UNLOCK CCW" set/unset logical > locks in the controller. the value specified for logical locks can be > arbitary value ... applications can establish the possible > convention/meaning (and required cooperating application) > > by comparison reserve/release channel programs would prevent other > processors from accessing device for i/o ... even if the other > processors didn't execute a reserve. > > distributed lock manager I did for ha/cmp ... required cooperative DBMS > (or other cooperative appilcations) on all the clustered processors > http://www.garlic.com/~lynn/subtopic.html#hacmp > > and I did some amount of slight-of-hand to get scaleup performance > in the ha/cmp distributed lock manager ... reference here > http://www.garlic.com/~lynn/95.html#13 > > not so much mentioned in direct scaleup ... but there was also some > hacks required to drastically cut down elapsed time for DLM recovery in > various kinds of failure scenarios. > > and some old-email about cluster scaleup ... not just DBMS > http://www.garlic.com/~lynn/lhwemail.html#medusa > > and > http://www.garlic.com/~lynn/2009p.html#43 From The Annals of Release No > Software Before Its Time > http://www.garlic.com/~lynn/2009p.html#46 From The Annals of Release No > Software Before Its Time > > more recent > http://www.garlic.com/~lynn/2010k.html#3 Assembler programs was Re: Delete > all members of a PDS that is allocated > > > -- > 42yrs virtualization experience (since Jan68), online at home since Mar1970 _________________________________________________________________ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
