On 2017-03-16 05:34, Timothy Sipples wrote:
A few years ago (2013) Linux started supporting "raw-track access mode" to
ECKD DASD, beginning with Linux kernel Version 3.11. Eberhard Pasch briefly
describes raw-track access mode here:
http://linuxmain.blogspot.sg/2013/11/raw-eckd-access-from-zlinux.html
I'm wondering if anybody uses raw-track access mode to copy and backup z/OS
volumes, including startable volumes, and what your experiences are. Please
note that the z/OS volume(s) should be offline (to z/OS) before accessing
them from Linux. Nonetheless, raw-track access mode seems like an
interesting way to use Linux on z for certain z/OS-related maintenance
tasks, especially for development and testing. Raw-track access mode also
applies to the other operating systems that can use ECKD volumes (z/VM,
z/VSE, z/TPF).
I think this approach has a couple of disadvantages versus DFDSS (or
equivalent) backups:
1. The z/OS volume should be offline to [all instances of] z/OS.
This is often not feasible.
2. If needed, an individual data set can be restored from a DFDSS full
volume backup. A Linux raw-track backup will need to be restored in
its entirety (requiring an additional volume) in order to get at
a copy of the individual data set.
--
Regards, Gord Tomlin
Action Software International
(a division of Mazda Computer Corporation)
Tel: (905) 470-7113, Fax: (905) 470-6507
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