TimeFinder/Mirror: Symmetrix TimeFinder/Mirror is essentially a business continuance solution that allows the use of special business continuance volume (BCV) Symmetrix devices. Copies of data from a standard Symmetrix device (which are online for regular I/O operations from the host) are sent and stored on BCV devices to mirror the primary data. Uses for the BCV copies can include backup, restore, decision support, and applications testing. Each BCV device has its own host address, and is configured as a stand-alone Symmetrix device.     TimeFinder/Clone: Creates full-device and extent-level point-in-time copies.      TimeFinder Clone and TimeFinder Mirror uses two different operations and rules   TimeFinder Clone: symclone When you create the session between the Source and target, the Source will be in RW state and Target in Not Ready state. (SR:RW& Tgt:NR) Once you activate the session, both the source and the target will be in RW state. (SR:RW& Tgt:RW)   TimeFinder Mirror: symmir Associate session: At this state there is no copying yet. and both standard and BCV devices are RW. (SR:RW& Tgt:RW) Establish session: Create the relationship between the std and bcv device, at this stage the standard devices is RW and BCV is not ready (SR:RW & tgt:NR) Once you split the relationship, both standard and BCV are in RW state (SR:RW& Tgt:RW)  From the above, the symclonde activate is equivalent to symmir split command where both Source and Target can be modified, enabled and disabled.  Please see page 118 -table 3 for details mapping of the TimeFinder/Mirror operation to their TimeFinder/Clone operational equivalents. [URL]
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What is the relation or difference between mirror,clone and copy?