Home > Storage > PowerMax and VMAX > Storage Admin > Dell PowerMax and VMware vSphere Configuration Guide > Copying virtual machines with TimeFinder
SnapVX operations are performed using the symsnapvx command to create point-in-time copies (snapshots) of critical data. SnapVX creates snapshots by storing changed tracks (deltas) directly in the Storage Resource Pool (SRP) of the source device. SnapVX snapshots are targetless. There is no target device unless the snapshot is linked. Snapshots consume minimal cache space rather than disk space. If you ever need the application to use the point-in-time data, you can create links from the snapshot to one or more target devices. If multiple snapshots exist and the application must find a particular point-in-time copy for host access, you can link and relink until the correct snapshot is located.
SnapVX supports up to 256 snapshots per source device (including any emulation mode snapshots) or 1024 snapshots at the storage group level. The legacy session limits still apply to the emulations. For a more detailed overview of TimeFinder SnapVX functionality including I/O flow, see the appropriate product guides.