Not only are there many IBM APAR's on the subject of rewinds, but you should also check if the devices are defined as AUTOSWITCHABLE. If they are AUTOSWITCHABLE and the VERIFY_POLICY is set to YES then OPEN will always verify the volume (rewind back to the beginning of the volume and re-read the VOL1) every time a new file is added to the volume. This is a HUGE performance impact, re-winding back to the beginning of the volume for every new file. A quick check would be to change the VERIFY_POLICY and rerun the impacted jobs, that will show what an impact this is. This alone might be a reason to stay with CA-MIA instead of switching to AUTOSWITCHABLE if you share drives outside of a sysplex environment.
Russell Witt CA-1 Level-2 Support Manager -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] Behalf Of Bruce Black Sent: Wednesday, October 11, 2006 8:30 AM To: [email protected] Subject: Re: Moving data from old cartridges (3490) to new ones (3590) > > CA-COPYCAT is a product that can do what you want. One warning about > COPYCAT, the more data sets you stack on a 3590, the longer it takes, I > think it rewinds the tape between each data set written to a 3590, for > 50 data sets it's not a big deal, for 500 or 5,000 it is a big deal. That might be an IBM bug. FDRABR got bit by several IBM APARs which caused rewinds between files for apps like ABR and COPYCAT which open multiple files on the tape. -- ...<snip>... ---------------------------------------------------------------------- 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
