A cylinder is not a track. Depending on the DASD type, a cylinder might be composed of 12 tracks for example. z/VSE and z/OS people have those numbers in their heads, z/VMers count in cylinders.
DFSMS COPY, it can read a whole cylinder with one I/O, and write with one I/O. Not friendly to other users of the given DASD, but makes a copy as fast as possibe. 2010/3/16 Schuh, Richard <rsc...@visa.com> > 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? > > Regards, > Richard Schuh > > > > -- Kris Buelens, IBM Belgium, VM customer support
