Bruce, Ron: I was referring to the "write side" of the operation. Reading back the intermediate files, although potentially benefiting from speed enhancements like read-ahead and PAV, is going to be throttled by the network bandwidth.
I'll admit that it's been a while since I did any serious DASD throughput tests with decent hardware. Best I've seen (informally) with the hardware I have available to me at the moment is about 15MB/sec (on a z800). What kind of numbers do you see when *writing*? (File must be large enough to remove the effects of any write cache.) At 09:45 AM 2/13/2006, Bruce Black wrote: >>you >>could get up to 8-10MB/sec with 3490s -- which is in the same >>ballpark as most of today's DASD. >Doing an FDR backup of a single disk to DUMMY, to get pure disk I/O rates, we >have been able to achieve 70MB/sec and more on FICON channels with fairly >current disk hardware from several vendors. > >Its been my experience that disk and tape speeds tend to leapfrog. A new tape >model will be faster than most disks, then new disks will outpace it, etc. >For example, the new IBM TS1120 claims up to 100MB/sec transfer rate. ================================================== Art Celestini Celestini Development Services Phone: 201-670-1674 Wyckoff, NJ ============= http://celestini.com ============= Mail sent to the "From" address used in this post will be rejected by our server. Please send off- list email to: ibmmain<at-sign>celestini<dot>com. ================================================== ---------------------------------------------------------------------- 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
