Alan, We have been using our current DASD setup for about 5 months now, with no problems, until a couple of days ago. We have 896 (256+256+256+128) devices on the Escon channels, using 4 control units, which PTK shows as 3990-6. AFAIK this should all be nicely within the IBM and EMC limits. What puzzles me is that we do millions of IOs to all those devices, but the problem only occurs with the IPL command in a virtual machine. Is there some special kind of IO involved with IPL?
Thanks, Geert. _____________________________ Geert Dieltiens Systeembeheerder Informatica J. Van Breda & C° Tel.: + 32 3 217 50 16 -----Original Message----- From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf Of Alan Altmark Sent: woensdag 25 maart 2009 16:33 To: [email protected] Subject: Re: FW: IPL 190 hangs in zVM 5.4 On Wednesday, 03/25/2009 at 03:54 EDT, Dieltiens Geert <[email protected]> wrote: > I made that device available to a VM in another LPAR on the same CEC, and there > the IPL worked. > Our 3 LPARs share the same Escon channels to an EMC box. Each LPAR only uses > it's own set of DASD devices (the other devices are set offline according to > SYSTEM CONFIG "OFFLINE_AT_IPL"). > > In the production LPAR I see msgs like this on the OPERATOR console: > HCPMHT2153I DASD B03C I/O CANCELLED DUE TO A MISSING INTERRUPT > They started appearing since the moment that I IPL'd another VM in another LPAR > last weekend. I thought that maybe some devices were being used in both LPARs, > but I checked, and that's not the case. > > Maybe EMC can find out more... I have seen odd I/O incidents (tho not on EMC) when the number of devices defined in an I/O configuration exceeds the number supported by the control unit. E.g. every dasd chpid with every device on the chpid defined to all the LPARs. As soon as a device "beyond the limit" is used, it pulls the device away from whoever had it first. But working it through EMC will be good. Alan Altmark z/VM Development IBM Endicott DISCLAIMER This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify [email protected] This footnote also confirms that this email has been checked for the presence of viruses. Informatica J.Van Breda & Co NV BTW BE 0427 908 174
