That's what I suspected. The numbers I am getting are pretty consistent with it.
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:ib...@listserv.uark.edu] On Behalf Of Tom Rae > Sent: Tuesday, March 16, 2010 12:08 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: DDR > > Based on a number of disk platform migrations during which I > used IND USER and various products that digest CP Monitor > data to track progress, DDR does full track reads when > copying from disk to disk. The same is true for disk to tape. > > Tom > > Schuh, Richard wrote: > > When DDR copies one disk to another, a COPY ALL operation, > does it do > > full track reads and writes, copy an entire cylinder in a > single I/O, > > or what? > > >
