What I have been told is that z/OS no longer uses the alternate tracks, so the reformat removes them from the VTOC.
Frankly, I haven't looked into this deep enough to know how you would ever get a "bad" track since there is so little use of real 3390 disk volumes anymore to cause z/OS to try and use an alternate track in the VTOC. Tom Moulder -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Michael Bradley Sent: Tuesday, July 31, 2007 9:55 AM To: [email protected] Subject: Re: EMC DMX3-1500 and REFORMAT VTOC John, ========================== …we are expanding our storage by about 1.5TB and moving to a DMX3… …as part of this process EMC is stating that we need to do a REFORMAT VTOC across our farm… …have not been able to pin the whys and hows down… …might someone have the whys and hows? ========================== It's likely that this is insurance against volumes that don't conform to the conventional physical layout, particularly where alternate tracks are concerned. Michael No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.11.0/927 - Release Date: 7/30/2007 5:02 PM ---------------------------------------------------------------------- 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
