Buffered Tape Writes - HP StorageWorks N1200 User Manual

Auto Assigned Maps
An auto assigned map is built dynamically and contains all of the devices found
during discovery. This map will change automatically any time the discovery
process finds a change in the devices attached. This map cannot be modified by
the user.
SCC Maps
An SCC map is only available on Fibre Channel ports and contains only a single
entry for LUN 0. This LUN is a router controller LUN. Access to attached devices
is managed using SCC logical unit addressing.

Buffered Tape Writes

This option is designed to enhance system performance by returning status on
consecutive write commands prior to the tape device receiving data. If data does
not transfer correctly, the router returns a check condition on a subsequent
command.
Commands other than Write are not issued until status is received for any
pending write, and status is not returned until the device completes the command.
This sequence is appropriate for tasks such as file backup or restore.
Some applications require confirmation of individual blocks being written to the
medium, such as for audit trail tapes or log tapes. In these instances, the Buffer
Tape Writes option must be disabled.
Network Storage Router N1200 User Guide
Configuration Overview
35