> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Craddock, Chris > Sent: Thursday, January 04, 2007 10:23 AM > To: [email protected] > Subject: Re: Just another example of mainframe costs. > > > > When they found out what I paid for maintenance per year > for 500gib I > > couldn't get them to stop laughing. > > I bought an external 500GB USB2 backup disk for a home system > yesterday > for a couple of hundred bucks. So yeah, even though things have come > down a long way, mf costs are still out in the ozone. > > CC
You are not doing an apples-to-apples comparison. I will grant that the actual "drive" platters et al. may be the same. But your USB drive is likely slower (5400 or 7200 RPM vs. 15,000 RPM). Your interface is much slower (USB vs. Ficon). Your USB drive is a single point of failure, unless you are putting it in a software RAID array of some sort. Your USB drive may or may not have "tagged queuing" to minimize seeks. Of course, the mainframe DASD box has gigabytes of RAM cache to speed it up and help mask latencies. It also likely has "intelligent" pre-staging of data from disk to cache. However, I will agree that Enterprise zSeries DASD is still more expensive that the corresponding Enterprise "Open" Systems (Windows and UNIX) DASD. Does anybody know about iSeries DASD prices? Just curious. -- 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
