An IPL isn't an action? True, the guest was not aware that it would harm the system, but absent that action by the guest, there would not have been a problem. The guest was an unwitting agent, a part of a bot net, as it were.
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Bill Holder > Sent: Thursday, September 17, 2009 9:14 AM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: VM lockup due to storage typo > > I don't entirely agree. The action of the guest did not > cause harm to CP, it was the action of the operations staff > which did. This is not a denial of service case that I can see. > > Bill Holder > z/VM Development, Memory Management team leader, IBM > > On Tue, 15 Sep 2009 09:59:09 -0700, Schuh, Richard > <rsc...@visa.com> wrot= > e: > > >Maybe CP couldn't know that the guest would do something bad, but it > >sho= > uld > know that it has opened itself to the possibility that the > guest could, i= n normal operation, cause the problem. > >One of Alan's first precepts of information security and > integrity is > >th= > at > the guest cannot be allowed to harm the CP. This clearly > violates that. > > > >Regards, > >Richard Schuh > > > > > > > >> -----Original Message----- > >> From: The IBM z/VM Operating System > >> [mailto:ib...@listserv.uark.edu] On Behalf Of Tom Duerbusch > >> Sent: Tuesday, September 15, 2009 9:19 AM > >> To: IBMVM@LISTSERV.UARK.EDU > >> Subject: Re: VM lockup due to storage typo > >> > >> CP wouldn't know at IPL time, the guest would, not could, > but would > >> cause such harm. > >> > >> Just because you say you can use xxx GB, doesn't mean you would > >> actually use them. > >> > >> When page fills, it over flows to spool. > >> When spool fills, CP abends on the next pageout. > >> > >> Tom Duerbusch > >> THD Consulting > >> > >> >>> Marcy Cortes <marcy.d.cor...@wellsfargo.com> 9/15/2009 > >> 11:02 AM >>> > >> See a thread on this list with subject "Sanity check?" > from Oct 2007 > >> for what happened when I did the same thing ;) > >> > >> You probably filled page space. > >> > >> I still think IBM should refuse to IPL a guest that will > cause such > >> harm. > >> > >> > >> Marcy > >> > >> "This message may contain confidential and/or privileged > information. > >> If you are not the addressee or authorized to receive this for the > >> addressee, you must not use, copy, disclose, or take any > action based > >> on this message or any information herein. If you have > received this > >> message in error, please advise the sender immediately by reply > >> e-mail and delete this message. Thank you for your cooperation." > >> > >> > >> -----Original Message----- > >> From: The IBM z/VM Operating System > >> [mailto:ib...@listserv.uark.edu] On Behalf Of Lee Stewart > >> Sent: Tuesday, September 15, 2009 8:39 AM > >> To: IBMVM@LISTSERV.UARK.EDU > >> Subject: [IBMVM] VM lockup due to storage typo > >> > >> Does anyone have an idea of how we might have gotten out of > >> this without an IPL? > >> > >> VM LPAR has 175G of memory and a flock of Linux Oracle guests... > >> Several guests needed more memory added so the directory was > >> updated and one by one the guests shutdown, logged off and > >> back on. So far, so good. > >> > >> But... In changing the memory for many guests, and it being > >> late at night after a long day, while meaning to set a > >> guest's memory to 9728M, it got set to 9728G. When that > >> guest was cycled we see the message on the console that it's > >> memory was limited to 8TB (HCPLGN093E), then the VM system > >> appeared to freeze. > >> > >> We couldn't get in via TCP/IP, or the HMC Operating System > >> Messages screen, or the HMC Integrated 3270. > >> > >> Finally had to IPL. Even that was wierd as I'd have > >> expected the Load > >> Normal to shutdown, it just IPLed. We did NoAutolog, > fixed the typo = > > >> and all came back up ok... > >> > >> I suspect CP was scrambling paging everything in the world > >> out as Linux > >> tried to initialize that 8TB of memory... But I'm surprised > >> I couldn't > >> even get into the HMC consoles (to kill just that one guest > >> as opposed to all of them).. > >> > >> Any thoughts? > >> Lee > >> -- > >> > >> Lee Stewart, Senior SE > >> Sirius Computer Solutions > >> Phone: (303) 996-7122 > >> Email: lee.stew...@siriuscom.com > >> Web: www.siriuscom.com > >> ========================= > ========================== > ======================= >
