Is this supposed to be an answer to my question?
Regards, Richard Schuh ________________________________ From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Kris Buelens Sent: Tuesday, March 16, 2010 2:03 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: DDR 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<mailto: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
