HP Linear Tape File System Software - Manual (Page 16)

Library and serial number information
The TapeAssure data contains references to library serial numbers or host names. For tape drives
managed under HP LTFS, this column shows the string HP LTFS.
About the operation of the TapeAssure LTFS service
The TapeAssure LTFS service is implemented as a daemon that can be started and stopped using the
Sa_TapeAssure utility under the installation directory. TapeAssure transports tickets to Command View
TL that are pulled by HP LTFS when a tape is unmounted.
The TapeAssure LTFS service is configured to check for available tickets at 60 minute intervals by
default. You can change this configuration to match the unmount frequency. Processing overhead is
very low so extending the check interval is not necessary for performance reasons.
It is important that the tape is not unloaded manually because it will confuse the LTFS driver and not
result in a pulled ticket. LTFS will normally set Prevent Media Removal to ensure this doesn’t
happen but power cycles and force eject can still override this. Only an LTFS-controlled unmount
will result in a ticket that can be sent to Command View TL.
Some of the calculations from the tickets are estimates, so writing more data between unmounts results
in more accurate TapeAssure data. For this reason, some TapeAssure calculations will only be
performed when at least 4 GB has been written between unmounts.
Installation and configuration 16