HP 3PAR Remote Copy Software - Manual (Page 178)

B.42 setrcopygroup
Remote Copy User’s Guide InForm OS Version 2.3.1
■ The -nosnap option can be used when making a secondary group take over as the primary
after a disaster takes down the primary ( setrcopygroup failover -nosnap... ). This
option indicates that no incremental resynchronization of the primary group is possible
while the primary system is coming back online. Without this option, a snapshot is taken
when the secondary server takes over as the primary. That snapshot is used to do an
INCREMENTAL synchronization of the primary after it is restored. This assumes that there
was no loss of data in the primary volumes when the primary server went down.