> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Skip Robinson > Sent: Monday, August 04, 2008 10:13 AM > To: [email protected] > Subject: Re: couple dataset problem at IPL? > > All these symptoms are consistent with a case of 'lost CDS', > where XCF has > determined for whatever reason that the missing CDS is 'defective'. I > haven't seen this condition for years, but it has > happened--and not always > traceable to a clear cause. The number one suspect is volume > RESERVE. If > XCF cannot complete I/O to a CDS for even a short period, the > dataset will > be declared unusable and removed from the configuration. When this > situation occurs, XCF puts out a complaining or two and rolls on. Like > having your spare tire go flat. You probably won't notice > until you have to > move the bodies in the trunk to pull the spare out. If you > have all syslog > since the previous IPL, you will most certainly find a flurry of IX* > messages chronicling the CDS removal. > > You might not notice any of this until the next IPL. Years > ago we created > an automation routine to notify us loudly and clearly that we > had lost a > CDS. I forget the message(s) we key on, but I could dig into it if > requested. The last episode probably predated Health Checker. > The current > (1.9) HC does not seem to specifically list 'CDS > consistency', but there > are a couple of XCF checks that I would expect to holler if a > named pair > was not intact. > > Meanwhile, make sure that all CDSs live on their own volumes. It seems > wasteful to dedicate that much space to a handful of smallish > data sets, > but the effects of a sysplex wide outage far outweigh the > unused cylinders. > Also watch out for full volume backups that might grab a volume for an > extended period. Better not to back up CDS volumes at all. > > . > . > JO.Skip Robinson
Now that may be a real possibility!! The CDSes are on "system infrastructure" volumes. And they get an occasional RESERVE. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
