Chapter 14. Copy Services for the DS6000 457
14.5 IBM TotalStorage Global Mirror
Global Mirror copying provides a two-site extended distance remote mirroring function for
z/OS and open systems servers by combining and coordinating a Global Copy and
FlashCopy operations. With Global Mirror, the data that the host writes to the storage unit at
the local site is asynchronously shadowed to the storage unit at the remote site. A consistent
copy of the data is then periodically automatically maintained on the storage unit at the
remote site by forming a Consistency Group at the local site, and subsequently creating a
tertiary copy of the data at the remote site with FlashCopy. This two-site data mirroring
function is designed to provide a high performan ...