IBM E16RMLL-I - Tivoli Storage Manager, Implementation Manual, Page: 88 / 828

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IBM Tivoli Storage Manager Implementation Guide
Adding up all these numbers as stored in Table 2-15 on page 51 gives a total of
68 tape volumes required, growing to 75 in the first year, assuming a 10% growth
rate. You then need to consider this number against the library configurations
available for your chosen technology. The IBM System Storage TS3310 with
expansion unit has space for 128 cartridges, so this leaves some capacity for
future growth. It should be noted that Tivoli Storage Manager setups rarely if ever
shrink.
2.10.4 z/OS tape management
On all platforms except for iSeries and z/OS®, OS/390® (or MVS), Tivoli Storage
Manager provides its own tape management functions. For z/OS, it uses the
functions provided within the operating system or other tape library management
systems.
Tivoli Storage Manager uses data set names to identify various types of Tivoli
Storage Manager data sets. The data set name prefix is set by the device class
parameter PREFIX. Each device class can have a different data set name prefix.
The data set name suffix is fixed by Tivoli Storage Manager for various data
types. The suffix .DBB indicates a database backup data set. The suffix .BFS
indicates an on-site or off-site data copy.
Most tape library management systems on z/OS use the data set name to
identify tapes to be taken off-site. Since Tivoli Storage Manager uses the data
set name PREFIX.BFS for both on-site and off-site copies, the tape management
system has no way to identify tapes that must be moved off-site.
To choose another data set name for off-site copies, create another device class
for the off-site copies and choose a different prefix. Set the tape library
management system to trigger on this different PREFIX.BFS data set name and
off-site copies will be identified automatically.
Tivoli Storage Manager allows an external data manager (EDM) to control tapes.
To inform the EDM when a tape goes into a scratch status, you can use the
DFSMShsm™ ARCTVEXT parameter. Include the DELETIONEXIT ARCTVEXT
parameter in the Tivoli Storage Manager server options file. For more information
see IBM Tivoli Storage Manager for MVS and OS/390 Administrator's Guide,
GC35-0377.
If your tape management system uses program names to identify External Data
Managers, the Tivoli Storage Manager program name is ANRSERV.