Indeed, such tool is usually not needed, it is enough to know the copy
service ended with RC=0. It can be FlashCopy, TF/Clone, SRDF, PPRC, XRC,
Shadowimage.
One see the job finished with not errors so he's pretty sure that source
and target volumes are the same.
However let's assume the copy was performed week ago, by Frankie. And
Frankie is out of office. How can we be sure volume A has exactly the
same content as volume B? There several ways:
a) use some tool which Jesse asked about (however I don't know any).
b) perform the copy again just to create new copy. Sounds overkill, but
the tool above would generate at least the same I/O.
c) create dump of both volumes and compare them i.e. using some hash
function. Even more I/O and CPU cycles. The advantage is the volumes can
be online to different system (local and remote) and each of them
compute its own hash for comparison. At the time of verification no
connectivity between local and remote DASD is required.
My €0.02
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2019-04-23 o 22:13, Laurence Chiu pisze:
We are about to replace our DS8870 in the DR site with a new DS8886. This
is currently in a Metro Mirror relationship with production. We will copy
from the old SAN to the new SAN using Global Copy and then start a Metro
Mirror session from the production SAN to the new SAN. This is all using
Copy Services Manager. I must admit nobody has ever considered having to do
a track compare following the copy since that means you don't think any of
the copy services manager copy products have sufficient checking in them.
This is especially true when we regularly flash copy from our production
copy to a third copy and IPL our host from them.
On Tue, Apr 23, 2019, 11:52 AM Jesse 1 Robinson <jesse1.robin...@sce.com>
wrote:
Sorry for not taking the time to search the archives for this. We're
shortly moving from one DS8 DASD subsystem to another via global mirroring
(PPRC). We have the process worked out, but we're looking for the quickest
possible way to verify that the copy of a volume is identical to the
original. Systems will be down for the duration, so a utility that will
simply compare two volumes-for example track by track-in the shortest
elapsed time will win. On account of systems being down.
Of course the deadline is looming. TIA.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
323-715-0595 Mobile
626-543-6132 Office <===== NEW
robin...@sce.com<mailto:robin...@sce.com>
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