Re: EMC DMX3-1500 and REFORMAT VTOC

Tom,

======================
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.
======================
I can't argue the point.

However, EMC requires "traditional" formatting, My recollection is that it
has to do with certain IBM DASD models that DIDN'T have alternate tracks.

Michael

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Relevant Pages

  • Re: EMC DMX3-1500 and REFORMAT VTOC
    ... What I have been told is that z/OS no longer uses the alternate tracks, ... anymore to cause z/OS to try and use an alternate track in the VTOC. ... EMC DMX3-1500 and REFORMAT VTOC ...
    (bit.listserv.ibm-main)
  • RE: EMC DMX3-1500 and REFORMAT VTOC
    ... Alternative tracks are actually provided for in the controller and were last ... disk arrays had no microcode to take advantage of/or use alternate tracks. ... EMC DMX3-1500 and REFORMAT VTOC ...
    (bit.listserv.ibm-main)