Re:Second Data Center for Disaster Recovery

Discussion created by ca.portal.admin on Nov 5, 2009
Dear Listers :

We will be opening a new Disaster Recovery Center in less than a year.

We will be replicating all data to this center from our primary
operations using an IBM product called

""Global Mirror"".

All data is replicated at the DASD block level in real time for all

The primary and secondary sites are not expected to be more than a
minute or

two out-of-sync during the heaviest of processing.

All our archive journals are written to disk and then migrated off to

after several days.

Also, every day, we do a FLASHCOPY of the entire mainframe complex and

nightly tape backups of the Flashed volumes.

This also captures all database, disk journals, and journal archives.

With all databases, journals, and even journal archives on disk...


In a true disaster, it seems that recovery is as simple as starting an
instance of IDMS at the DR site and

let it go through WARMSTART.

Am I correct about this, or is it more complicated than that?

And if more complicated, I'll have the archives replicated if I have to
do more.


Jon Gocher
IDMS 3rd-party providers forum


Re: Second Data Center for Disaster Recovery
"As long as new DB files are on covered volumes (and all our volumes are
covered), no other work for DBA. . . all work controlled by STG MGT
group . . . DBA only required to verify integrity of DB after fail-over
tests .

Since it all takes place in the DASD Controller, no performance hit, no
cpu hit. . . during the initial setup (months long) we had some hiccups,
but no major incidents to production. . .=20

We had reservations about performance degradation during database
reorgs, e.g., but even that does not seem to affect replication thru
Global Mirror.

We started out replicating 9000 miles, from Scottsdale to Prague. . .
now we do a much shorter distance.