Network Mode

JetStream, by default, operates in a client-server architecture. The client software resides on the system where the files are copied from. The server software resides on each system where the files are to be copied to. The client software can communicate with any number of servers at the same time, including a server on the same system as the client software.

JetStream can then copy or replicate a file or list of files to another disk on the same system as well as to any number of other systems. Each server can in turn replicate the software to any number of disks on its own system. Thus, you may copy a file to 3 different disks on a single remote system or to 3 different remote systems or all of these at the same time.

Network I/O, disk I/O, and compression are overlapped to provide the speed JetStream can attain.

Local Mode

JetStream can also be invoked using the /LOCAL qualifier. This sofware is a single VMS image and only runs on one system. It is highly optimized to give incredible performance copying or replicating files on the same system. The target disks need only be 'seen' by the JetStream software. The disks may be locally connected to the same computer or clustered. No compression is done in this mode. The files are simply copied with overlapping I/O to provide speed.