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We use EMC's SRDF technology to replicate one of our DB, and we do not use suspend/resume.
You may check metalink /ID 340305.1) and Tom Kyte (http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:373618158622), both says that if your hardware vendor tells you to do it, do it :)
Use SUSPEND and RESUME if your storage hardware vendor requires this.
If the storage implementation is such that your database filesystems are on LUNs which happen to not really get snapshotted at a consistent point in time (i.e. as an atomic operation) you may lose write-ordering.
So, the requirement to SUSPEND/RESUME is based on how the Snapshot/Clone technology is implemented in the storage.
Note : The BEGIN BACKUP and filesystem 'sync' commands are also necessary !!
Hemant K Chitale