HP XP P9500 Storage - Manual (Page 139)

4. When pair status becomes Duplex, create a pair in the second mirror, from the local site to
the second remote site. Specify the same primary volume and journal used in the first mirror
as the primary volume and journal in the new pair.
Select a Mirror ID from 0 to 3, though not the one used for the first pair.
Make sure pair status changes to Duplex before proceeding.
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