The intermediate site should be in a safe environment separate from the primary site, with its
own power supplies, thus reducing the possibilities for unplanned outages affecting both the
local and the intermediate sites at the same time.
In this three-site implementation, if an outage occurs at the local site, the intermediate site
volumes will be holding a point-in-time copy of the data at the time of the outage. PPRC-XD
will do a catch-up, and so after a while the remote site volumes will be 100% in
synchronization with the intermediate site volumes. ...
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