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The Question is:
We are setting up the Hot Standby option with Oracle Rdb, but some of our
important production data is in RMS files. The production and standby sites
are networked and have a 45Mbps (DS3) connection.
What are my options for keeping a close to real-time copy of the flat files at
our offsite location?
We are going to be upgrading VMS soon so if new features will be available for
use soon also.
The Answer is :
Why have a standby site when you can have a distributed cluster and
can use the systems and the data from all hosts concurrently?
By its very nature, a standby site without this capability is wasteful
-- the resources at the standby site are unused in normal production
save for the journaling- and BACKUP-related operations.
Most customers would clearly prefer to get some benefit and some use
from all available servers and these resources, prefering to see some
degraded operations during failures. (Further, regular use of these
remote "spare" systems ensures that the remote site is actually
operational, something you clearly don't want to have to determine
during an actual fail-over.)
With a distributed multi-site cluster, you can have local shadowset
volumes containing the actual files on the volumes, given the clustering
capabilities that are possible with a DS3-class (or faster) link.
If you wish to maintain journaled and recoverable copies of your RMS
files, the RMS journaling capabilities are available as well.
Disaster-Tolerant Cluster Services consulting and support is available
from HP. In general, establishing a reliable and functional
disaster-tolerant configuration (or even a fail-over configuration)
is far more difficult than it might initially look, with many and
particularly many subtle considerations involved.
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