Business continuity solutions implementation requires special considerations in the  infrastructure and network setup. Throughout this book, many recommendations have been  made regarding specific topics, but for a complete coverage of the implementation guidelines  see  IBM Spectrum Virtualize and SAN Volume Controller Enhanced Stretched Cluster with  VMware , SG24-8211 for Enhanced Stretched Cluster and  IBM Storwize V7000, Spectrum  Virtualize, HyperSwap, and VMware Implementation , SG24-8317 for HyperSwap  configurations. Appendix B. Business continuity  499 Ability to use FlashCopy  with an HA solution Yes (although no  awareness of the site  locality of the data) Yes (although no awareness  of the site locality of the  data) Limited: You can use  FlashCopy maps with a  HyperSwap Volume as a  source; avoids sending data  across link between sites Ability to use Metro Mirror,  Global Mirror, or Global  Mirror Change Volume  with an HA solution One remote copy; it can  maintain current copies on  up to four sites One remote copy; it can  maintain current copies on  up to four sites No Maximum number of  highly available volumes 5,000 5,000 1,250 Minimum required paths  for each logical unit (LUN)  for each host port Two Two Four Minimum number of I/O  Groups One One I/O Group is supported,  but it is not recommended Two Rolling disaster support No Yes Yes Licensing Included in base product Included in base product Requires Remote Mirroring  license for volumes. Exact  license requirements might  vary by product. Standard Stretched  Cluster Enhanced Stretched  Cluster  HyperSwap