John, I don't agree that this is a single point of failure. Darth's point that disk arrays, be them HDS, EMC or whatever, are designed to be disaster tolerant is perfectly valid. Any catastrophic event that will lose data on a single volume in a disk array controller is likely to affect many, if not all volumes.
In a Disk array like a USP-V, a volume is not a "thing" and it does not fail. Things fail and that may affect many volumes. If you use one, two or ten volumes for your catalogs in the same controller you have not improved your protection against multiple failures. You would need your volumes on two or more USP-V to do that. Personally I think your single volume with many catalogs idea has merit. Darth is correct that you should consider PAV or HyperPAV, but if your catalogues get busy I would also suggest locking them into cache. The Dynamic Cache Management software comes with the USP-V and you can use it to make a Solid State Disk area in cache and speed up your catalog access. To help with catalog recovery you may want to consider using a second volume for Shadowimage or FlashCopy copies of the catalog volume or the catalogs themselves at regular intervals. Doing this daily, at batch start and end, or every few hours would improve your survivability against logical errors in a catalog in a way that simply spreading them around cannot achieve. I like your idea. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of > John Norgauer > Sent: Tuesday, May 04, 2010 8:32 AM > To: [email protected] > Subject: Re: [IBM-MAIN] Catalog re-location > > Yes, I realize there would be a single point of failure, and we probably > will not put them all on one volume. > > We are not using ECS, and we are using PAV and RAID. > > > > John Norgauer > Senior Systems Programmer > Mainframe Technical Support Services > University of California Davis Medical Center > 2315 Stockton Blvd > ASB 1300 > Sacramento, Ca 95817 > 916-734-0536 > > SYSTEMS PROGRAMMING...... Guilty, until proven innocent !! " JN 2004 > ........ > "Hardware eventually breaks - Software eventually works" anon > ........ > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
