> -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Gibney, Dave > Sent: Wednesday, April 01, 2009 2:40 PM > To: [email protected] > Subject: Re: "A foolish consistancy" or "3390 cyl/track architecture" <Snipped> > I don't see the problem with coding over generous space estimates. For > most of allocations I don't require a space parameter at all. The > default DATACLAS allows a big extended striped dataset. And with SMS > compression. We only see x37 abends when the JCL explicitly calls for > too small an allocation, and extended/striping/compression isn't > selected by DFSMSdfp. Usually due to fragmentation. > > Yes, I have sizable pools with and generous free space threshold, but > DASD is cheap. I've probably spent more writing this note than being > stingy on disk space would buy me. > > From a user prospective, and even from a z/OS Sysprog perspective, I > don't care about the underlying FBA or CKD or QED of the architecture. > > We still have many outdated parsimonious attitudes from the days when > bytes were expensive. DASD is cheap, so is memory. z/OS CPU is also > cheap, too bad the software (mostly ISV) is still priced by old time > thinking.
Indeed, many storage administrators still hold such parsimonious attitudes, because disk isn't "cheap" in the multi-terabyte quantities that large companies have to buy it. Six figures per "box" acquisition is not unusual for a large organization. Those kinds of numbers get the attention of bean counters, who tell the executive suite, who tell the CIO to tell the storage administrators to figure out a way make do with what they've already got. Most programmers (of any kind) have no say in the matter. Yes, disk is *relatively* cheap for what you get, and getting more so every day. That doesn't make any particular acquisition "cheap" by financial measurements. You are very lucky to be where you are, and to have the management blessing to do as you have described. Peter This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- 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
