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296 IBM System Storage DS6000 Series: Copy Services with IBM System z
23.7.10 Conclusions
This concludes the sequence of steps you have to go through for a swap to the remote site
and coming back to the local site after service is restored at the local site.
In particular, the check on a valid Consistency Group after a primary site failure is a challenge
when you consider a large configuration with many volume pairs. Each command usually
addresses a single pair of volumes. When you have a large quantity of volume pairs, this
requires automation, for example, to check all the FlashCopy relationships after a primary site
failure. Note that for a planned site swap, you may not have to check for a valid Consistency
Group because, through a proper command sequence and verifying their successful
completion, the possibility of an inconsistent group of C volumes is minimal.
Global Mirror is a 2-site solution that can bridge any distance between two sites. There are
ready-to-use packages and services available to implement a disaster recovery solution for
2-site remote copy configurations. IBM offers the GDPS and eRCMF service offerings to
deliver solutions in this area; see Part 8, “Solutions” on page 431, for more information. You
can also visit the IBM Web site and see the Services & Industry Solutions page for more
information.