We have thousands of devices in the IOCP that we never want to see on our VM system; however, there are some we do need to access from VM intermixed with them. In this case, we find it better to add yet another category, Not_Accepted, which prevents the devices from being sensed and the building of control blocks for them. This prevents bloat in the use of storage and in any monitor displays or reports. If you went ahead and sensed the devices and took them offline after the IPL, the device blocks would be built for them and they could affect the way space is allocated and used in your monitor segment.
As with all things that affect the configuration, you must take care when specifying that devices are to be kept offline or not even sensed. It is certainly best to insure that you do not include devices which you need in the offline or Not_Accepted lists. As we like to say, "Your gun, your bullet, your foot." Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[email protected]] On Behalf Of Rich Smrcina > Sent: Wednesday, July 14, 2010 8:26 AM > To: [email protected] > Subject: Re: Devices OFFLINE at IPL > > That's one way, as long as the device numbers are never, ever > used in this VM system. If they are, on the next IPL it will > cause a little problem. > > Another possibility is to have an exec go through the DASD > device list and vary off the devices based on whether the > volume 'belongs' to the VM system. 'Ownership' is based on > an identifier in the VOLID, eg: VM1RES, VM2WK1, etc. > > On 07/14/2010 10:11 AM, Billy Bingham wrote: > > > > > > Would the following be the proper way to specify devices, in the > > SYSTEM CONFIG file, that I don't want to come online at an IPL: > > > > > > Devices , > > Online_at_IPL 0000-FFFF, > > Sensed 0000-FFFF, > > Offline_at_IPL 0500-050F > > > > > > > > Thanks, > > > > Billy > > > -- > Rich Smrcina > Phone: 414-491-6001 > http://www.linkedin.com/in/richsmrcina > > Catch the WAVV! http://www.wavv.org > WAVV 2011 - April 15-19, 2011 Colorado Springs, CO >
