We use Mod 54 for our HFS/zFS files for sysres. I see no issue with using Mod 54s. The problem comes with backup and recovery. Using the smaller volume sizes allow for multiple SYSRES volumes so that SYSRS1 is IBM required to IPL datasets, SYSRS2 is OEM vendor and other files that are not required at IPL. So if one is unavailable the system can still be IPLd. However, if you have everything on a mod54 you risk not being able to IPL if there is an issue with that one volume. Then at DR, how long will it take to restore all of the sysres volume? If Replicating to another DASD volume, what are the time differentials?
Second, a Mod 54 may not be large enough to contain all files, HFS, zFS and anything else you place on it. So watch the file growth. Lizette > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf > Of CAPRON Romain > Sent: Wednesday, October 10, 2012 6:12 AM > To: [email protected] > Subject: 3390 Mod54 for sys volumes > > Hi, > > We want to minimize the number different geometry for our dasd. We're asking > if it's > reasonable to only use mod54 dasd. > More and more people say that with modern dasd storage, it's no more usefull > to work > with 3390-9 and 3390-27... > All of your dasd are pprc"ed" > > Thanks in advance for your feedbacks ! > > Regards, > > Romain > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
