Chapter 3 System Preparation
154 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
WARNING: The contents of this tape will be overwritten so be sure to mount the correct tape
cartridge.
3.5.5.3 IRIX
On each Tape Mover node, verify that each tape drive has variable-length block size set.
To manually check whether variable block size is enabled (see warning below), the following
should complete successfully:
% dd if=/dev/null of=/dev/rmt/tps2d6nr bs=80 count=1
% dd if=/dev/null of=/dev/rmt/tps2d6nr bs=1024 count=1
Ifvariable-length block sizes are not enabled, consult your driver documentation for procedures to
enable it.
On each Tape Mover node, verify that the raw read and write I/O performance of all HPSS tape
drives are at the expected levels. Create one or more talbes documenting the results.
Tomeasure uncompressed write performance (see warning below) on tps2d6 (Note that specifying
tps2d6nr will cause the tape not to rewind):
% iocheck -w -t 20 -b 1mb /dev/rmt/tps2d6nr
To measure the maximum-compressed write performance on tps2d6 (and then rewind the tape):
% iocheck -w -t 20 -f 0 -b 1mb /dev/tps2d6nrc
To measure read performance on drive tps2d6 using the previously-written uncompressed and
compressed files:
% iocheck -r -t 20 -b 1mb /dev/tps2d6nr
% iocheck -r -t 20 -b 1mb /dev/tps2d6nr
To empty the tape:
% mt -f /dev/tps2d6 rewind
% mt -f /dev/tps2d6 weof 2
WARNING: The contents of this tape will be overwritten so be sure to mount the correct tape
cartridge.
3.5.5.4 Linux
On each Tape Mover node, verify that the raw read and write I/O performance of all HPSS tape
drives are at the expected levels. Create one or more talbes documenting the results.