Wow. I don't think I could bring myself to put all of my catalogs on the same device - RAID DASD or no RAID DASD.
I worked in Storage Management only for a year back in the mid-90's, so PAV's are something I'm not familiar with. Going by the name only (and some very quick lookup via Google); are they some sort of constant/permanent Dual Copy situation? Automatic failover? BTW... in searching for "PAV + IBM" on Google, I ran across this link that you may already be familiar with, but I was not. Very cool stuff that I just thought I would share. The "Vintage Views" links to the right of this page I thought were fascinating. Some marketing blurb about the IBM Stretch computer bragged about the fact that it "only" took up 2000 sq. feet of floor space. I felt that, among all the other techno-babble, was probably the most telling. http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV2085.html All the best, Scott T. Harder Mainframe Services, Inc. Naples, FL > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On > Behalf Of Darth Keller > Sent: Tuesday, May 04, 2010 8:46 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: Catalog re-location > > Single point of Failure - Other than John's saying he's moving to > Hitachi Mod 9's, he really didn't describe his storage. It would probably > be safe to assume (& watch me get burned on this one) he's got RAID DASD - > in which case he does have some protection. In my case, in the last 10 > years I've had zero DASD failures, but I've 5+ catalog failures which I've > had to recover from. So if he's going to be worried about a failure, I'd > say his time would probably be better spent looking at his catalog backup > & recovery procedures (insert plug here for DINO Software's TREX). > > With that said, I'm with Bob in that I'm 'old school' enough that I'd > spread my catalogs across at least a few volumes. For one thing, I want > plenty of room for catalogs to take 2ndary extents. Not much worse that > getting called at o-dark in the morning because some application failed > because a catalog can't take a 2ndary. > > John - are you running with PAV's? Even though catalogs can be cached in > memory in CAS and using ECS, eventually catalogs are going to need to be > updated meaning writes to DASD - if you don't have PAV's and you've got > all your catalogs on one volume, you've got limited access to your > catalogs. Something to consider - some of my catalogs are very busy > during certain times of the day and one volume would be an issue for me > without PAV's. > > ddk > > This e-mail message and all attachments transmitted with it may > contain legally privileged and/or confidential information intended > solely for the use of the addressee(s). If the reader of this > message is not the intended recipient, you are hereby notified that > any reading, dissemination, distribution, copying, forwarding or > other use of this message or its attachments is strictly > prohibited. If you have received this message in error, please > notify the sender immediately and delete this message and all > copies and backups thereof. Thank you. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
