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| General functionality considerations for VVR compression | ||
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Compression results in unavoidable CPU overhead, both at the Primary and Secondary sites. In a CVM configuration, the CPU overhead will only be seen on the logowner nodes of the respective CVM clusters.
VVR will not send the data in compressed format in following cases:
If either the Primary or Secondary hosts are not running 6.0 or higher, and the disk group version is not 170 or above
If the primary RLINK does not have compression enabled
If the compressed data size is greater than the uncompressed data size
If no memory is available for allocation of memory buffers from the NMCOM memory pool on the Primary site