This option for the IBM TotalStorage DS4300 Midrange Disk System with turbo option builds upon the existing Remote Mirror option by adding asynchronous mirroring support and the ability to suspend and resume mirroring. This doubles the maximum number of mirrors to 64 and enables FlashCopy operations to be performed on the remote mirrored volume. Remote mirroring enables you to maintain a remote mirror copy of a logical volume on another TotalStorage Disk System at a disaster recovery site.