Is this FICON or ESCON? On Tue, Jan 24, 2012 at 5:06 PM, Cosby, Bob - OCFO <bob.co...@nfc.usda.gov> wrote: > Ask the EMC vendor if the Subsystem has dynamic Parallel Access Volumes > (PAV's) turned on assuming the EMC Subsystem supports it. This creates > multiple volumes for one. > Puts the water where the fire is. > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf > Of Jousma, David > Sent: Monday, January 23, 2012 9:18 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: Going from mod-3 to mod9 > > Iosq? Really? This is raid dasd, isn't "slow" 3390-9's a thing of > the past? > > _________________________________________________________________ > Dave Jousma > Assistant Vice President, Mainframe Services > david.jou...@53.com > 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H > p 616.653.8429 > f 616.653.2717 > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On > Behalf Of Staller, Allan > Sent: Monday, January 23, 2012 10:09 AM > To: IBM-MAIN@bama.ua.edu > Subject: Re: Going from mod-3 to mod9 > > <snip> > 1. We just had 3390-9's configured into our EMC box. This box also > contains 3390-3's. Given that the hardware is the same throughout and > all other things being equal, is there any decrease in response time on > the mod-9's? > </snip> > > Beware of IOSQ! From the viewpoint of the Operating System, you now have > 3 times as much data behind the actuator on Mod-9's as Mod-3's. If the > Operating system *thinks* the device is busy, the IO is queued off the > UCB and never even tried until it comes to head of queue. Multi-system > access will exacerbate this even more. > > <snip> > 2. I have a VSAM file (with extended addressability) that currently > spans 27 mod-3's. My plan is to move it to 10 mod-9's using IDCAMS REPRO > to back it up then doing a DELETE/DEFINE, (changing the SPACE parameter > from CYL(2500 150) to CYL(9500 150)), then REPRO from the backup. Am I > setting myself up for a failure? > </snip> > > I do not believe there will be an issue. Obviously, you already have all > of the SMS stuff in place. I would, however suggest REPRO from > "original" to "original.new" and after successful repro operation, alter > "original" to "original.old" and then alter "original.new" to original". > In this way, the original is always available for a momentary recover if > any problems are discovered with the target of the repro. >
-- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
