9710 (StorageTek) Addendum for NonStop Servers

Addendum to the StorageTek™ 9710 for the Tandem Environment
The 5155/5159 Digital Linear Tape CRE and NonStop Kernel
9-57
Setting param1 Value
No data compression 1
Data compression 2
Notes:
• Changes to compression using SETMODE 162 are allowed
only at the beginning of tape (BOT); otherwise, the tape drive
returns an error.
• BACKUP and FUP utilities do not support SETMODE
operation.
9.6 Programming and Configuration Considerations
9.6.1 Choosing Block Size
The D30 operating system now allows much larger data records to
be created when writing to tape. The current limit is 56 KB;
however, if block sizes that can be read by most Tandem systems,
tape drives and control units are wanted to be created, do not create
data records larger than 32,767 bytes (32KB minus 1 byte) in size.
For a detailed discussion of these limits as they relate to the
BACKUP and RESTORE utilities, see “Using the BLOCKSIZE
Option”.