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Consistency Groups with TrueCopy--what's the difference?

Question asked by Sandy Wright on Sep 11, 2014
Latest reply on Sep 12, 2014 by Dang Luong

I'm new to Hitachi Storage and I'm trying to understand the difference between creating a pair relationship that is part of a consistency group versus one that is not.  In my reading on this it appears that a consistency group won't allow a split until all I/O has been written to the shadow/remote copy.   I've also read that if the host requests I/O to the PVOL and a split operation is in progress that I/O request won't get served until the split is completed.  Am I understanding this correctly?   In the case of the host wanting to write or read to the PVOL during a split, wouldn't a delay in this request create errors on the host side?    If anyone could shed some light or point me to a white paper or real world situation I'd appreciate. 

 

Thanks

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