I thought that the PC term was "seldom-ending channel program." :-)
Listen to Alan (the advice given would never have come from Chuckie, it was right-on)! The directory does not fit the description of being rarely used on most systems. Putting it on a volume with page space not only interrupts the paging, it slows down access to the directory making logon, link, and directory update activity poor performers, too. Regards, Richard Schuh > -----Original Message----- > From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] > Behalf Of Alan Altmark > Sent: Monday, November 07, 2005 10:12 AM > To: [email protected] > Subject: Re: Anomaly in the default paging and spooling setup > in zVM 5.1 > > > > Eeeeewwwwww! In general, volumes should be dedicated to > paging, not mixed > with other data. If you must share the volume, ensure the > other data is > rarely, if ever, accessed. > > CP starts a never-ending channel program on the paging volume > to handle > paging. If something else needs to be read or written, then > the channel > program is stopped, the other I/O is performed, and then the channel > program is re-started. If you're doing a lot of paging, > that's going to > hurt. > > Alan Altmark > z/VM Development > IBM Endicott >
