All memory so yes, all the baggage, cache, etc. But you can clean it up first! Use Sir Rob's wonderful cmmflush We clean up hundreds of dev servers every night and it has saved real $
https://zvmperf.wordpress.com/2012/07/06/using-cmm-to-flush-a-linux-guests-memory/ https://zvmperf.wordpress.com/2015/02/11/user-experience-with-cmmflush/ Marcy -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Graham Harris Sent: Friday, May 29, 2015 3:03 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] Are weekly z/VM IPLs necessary? Dumb question: Is live guest relocation of a z/Linux guest effectively a reboot of that guest, or does it transfer all the baggage that has accumulated over the life of the guest? On 28 May 2015 at 23:48, Mike Walter <mike.wal...@aon.com> wrote: > Enter the Wayback Machine for trip to 1996 by visiting: > > > http://listserv.uark.edu/cgi-bin/wa?A2=ind9610&L=IBMVM&P=R1016&1=IBMVM > &9=A&I=-3&J=on&X=D2B166CA66E8CA0104&Y=Mike.Walter%40aon.com&d=No+Match > %3BMatch%3BMatches&z=4 > > (watch out for URL line breaks of that link). > > That post was written before Linux ran on any IBM mainframes, and it > addresses some CMS application issues, but some parts (e.g. 'other > systems', and accumulated changes affecting the next IPL) still apply. > While you're there, search for other posts on that thread... > interesting and enlightening reading. > > While z/VM can shutdown and restart at astonishingly speed (well under > 10 minutes), large Linux servers can take much longer -- making the > business case for more frequent IPLs a more difficult decision. But > one must balance weekly IPLs against the potential for the extended > recovery time which may (place your bets) be required to recover from > those changes which have accumulated since the last IPL, and may > detrimentally affect the next > IPL. Provide your management with as many facts as you can find, and your > advice, then let them make a decision -- that's why they get paid the > big bucks, right? > > Mike Walter > Aon Service Corporation > The opinions expressed herein are mine alone, not necessarily those of > my employer. > > ------------------------------ > In response to: > > ------------------------------ > > > > Date: Wed, 27 May 2015 14:33:41 +0000 > > From: "Will, Chris" <cw...@bcbsm.com<mailto:cw...@bcbsm.com>> > > Subject: Are weekly z/VM IPLs necessary? > > > > We have gotten in the habit of IPLing our z/VM and zLinux guests every > = > > Sunday during our standalone window. With the window shrinking and > the = > > need for 24/7 availability is it really necessary to IPL every week? > If = > > not what potential problems could we run into by not doing the IPL > (memory = > > leaks, logs filling etc.). This is in comparison to the Intel side of > the = > > shop (Red Hat, Windows) where they go months between IPLs. The only = > > benefit I see is the opportunity to recycle WMB execution groups. > > > > Chris Will > > > > > > > > The information contained in this communication is highly confidential > and = > > is intended solely for the use of the individual(s) to whom this = > > communication is directed. If you are not the intended recipient, you > are = > > hereby notified that any viewing, copying, disclosure or distribution > of = > > this information is prohibited. Please notify the sender, by > electronic = > > mail or telephone, of any unintended receipt and delete the original = > > message without making any copies. > > =20 > > Blue Cross Blue Shield of Michigan and Blue Care Network of Michigan > are = > > nonprofit corporations and independent licensees of the Blue Cross and > = > > Blue Shield Association. > > > > > > > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, send > email to lists...@vm.marist.edu with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
