Thanks Alan that actually is a great help. I wish I could find what the format of content of R0's data area is.
On Fri, May 20, 2011 at 7:04 AM, Alan Altmark <alan_altm...@us.ibm.com>wrote: > On Friday, 05/20/2011 at 09:00 EDT, Tom Huegel <tehue...@gmail.com> > wrote: > > Can anyone point me to a doc that has the format of ECKD Home Address > (HA) and > > Record 0 (R0) records? > > It's odd that the most recent programming reference for ECKD DASD (IBM ESS > S/390 Command Reference, SC26-7298) does not describe the format of the HA > except to say that it is 5 bytes. > > Dragging out an old 3880 book, READ HOME ADDRESS transfers "the flag, > cylinder, and head bytes of the home address area." I'm assuming that's > of the form FCCHH. I only see a description of flag byte bits 6-7='10': > Next track defective. > > In that same 3880 book, READ SPECIAL HOME ADDRESS transfers "the skip > control bytes, segment number, physical address bytes, flag, and > identifier bytes (CCHH) of the home address area" with no further > description. > > I'm guessing that detailed HA content is part of the proprietary disk > architecture, but you'd have to raise a problem to your storage vendor to > find out. > > R0 doesn't have any special format except that it is 8 bytes with KL=0. > > The most r > Alan Altmark > > z/VM and Linux on System z Consultant > IBM System Lab Services and Training > ibm.com/systems/services/labservices > office: 607.429.3323 > mobile; 607.321.7556 > alan_altm...@us.ibm.com > IBM Endicott >
