5190/5194 Modular Tape Subsystem Manual

Operating the Cartridge Tape Drive and ACL
5190/5194 Modular Tape Subsystem Manual—426878-002
4-41
Using the NOUNLOAD Option
The default BLOCKSIZE is 8 (8192 bytes). When using larger block sizes, make sure
all tape subsystems that will read the tape support the BLOCKSIZE you specified.
Tape subsystems with lower BLOCKSIZE limits cannot read larger block sizes.
Before using BLOCKSIZE values larger than 28, consider this information:
•
Only K10000 and K20000 servers with 3216 tape controllers support BLOCKSIZE
values larger than 28.
•
The 3216 controller and MFC do not support BLOCKSIZE values larger than 28.
•
A tape that was backed up with a BLOCKSIZE larger than 28 can be restored only
on a system using a D30 or later version of RESTORE with a tape subsystems that
supports the larger block transfers.
•
Expand networks do not support BLOCKSIZE values larger than 28.
For more information about the BLOCKSIZE attribute, refer to the Guardian Disk and
Tape Utilities Reference Manual.
Using the NOUNLOAD Option
The NOUNLOAD option directs the BACKUP utility to rewind the final tape and leave it
online in the tape drive when the BACKUP process is completed. If you don’t specify
the NOUNLOAD option in the BACKUP command, the ACL returns the last cartridge
tape to its slot when the drive is finished writing to the tape. The ACL then
automatically loads the next cartridge.
1> BACKUP $TAPE1, $MYDISK.MYVOL.*, NOPROMPT, NOUNLOAD
TMF Support
The Transaction Management Facility (TMF) subsystem, which is part of the
Compaq NonStop Transaction Manager/MP (TM/MP) product, protects databases in
online transaction processing environments. To provide this service, the TMF
subsystem manages database transactions, keeps track of database activity through
audit trails, and supports online dumps.
After the TMF subsystem is running, you can use the TMFCOM command interface to
issue the DUMP FILES command, which initiates an online dump.
The following observations concern the TMF subsystem and online dumps:
•
TMF tape processing of online dumps requires labeled tapes (see Using Labeled
and Unlabeled Tapes on NonStop Himalaya K-Series Servers on page 4-42).
•
If you are using a TMF scratch tape for your online dump, verify that the tape is not
write-protected. See Setting the File-Protect Thumbwheel on page 4-3.
•
The TMF subsystem has its own recovery mechanisms for audited files. However,
you might want to use the BACKUP and RESTORE utilities (see Using BACKUP