6.4.4 IP Compression IBM FS9100 can average the IP compression capability to speed up replication cycles or to  reduce the bandwidth utilization. This feature reduces the volume of data that must be transmitted during remote copy  operations by using compression capabilities similar to those experienced with existing  Real-time Compression implementations. No License:  IP compression feature does not require an RtC software license. The data compression is made within the IP replication component of the IBM Spectrum  Virtualize code. It can be used with all the remote copy technology (Metro Mirror, Global  Mirror, and Global Mirror Change Volume). The IP compression is supported, with some  restrictions, in the following systems: The IP compression can be enabled on hardware configurations that support RtC only. The IP  compression feature provides two kinds of compression mechanisms: The hardware  compression and software compression. The hardware compression is active when  compression accelerator cards are available, otherwise software compression is used.  Hardware compression makes use of currently underused cards. The internal resources are  shared between RACE and IP compression. Software compression uses the system CPU  and might have an impact on heavily used systems. To evaluate the benefits of the IP compression, the Comprestimator tool can be used to  estimate the compression ratio of the data to be replicated. The IP compression can be  enabled and disabled without stopping the remote copy relationship by using the  mkippartnership  and  chpartnership  commands with the  -compress  parameter. Furthermore,  in systems with replication enabled in both directions, the IP compression can be enabled in  only one direction. IP compression is supported for IPv4 and IPv6 partnerships. GLYPH<SM590000> SAN Volume controller with CF8 nodes GLYPH<SM590000> SAN Volume controller with CG8 nodes GLYPH<SM590000> SAN Volume controller with DH8 nodes GLYPH<SM590000> SAN Volume controller with SV1nodes GLYPH<SM590000> FlashSystem V9000 GLYPH<SM590000> Storwize V7000 Gen1 GLYPH<SM590000> Storwize V7000 Gen2, Gen2+, Gen3 GLYPH<SM590000> Storwize V5000 Gen2 GLYPH<SM590000> Storwize V5100, V5000E GLYPH<SM590000> FlashSystem 9100 Chapter 6. Copy services  219