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4.4.3. IRIX
On each Tape Mover node, verify that each tape drive has the variable-length block size option
enabled.
To determine if the variable block size option is enabled, 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
If the variable-length block size option is 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 tables documenting the results.
To conduct the read and write tests on tps2d6, mount a scratch tape on tps2d6 and issue the
following commands.
WARNING: The contents of this tape will be overwritten by iocheck so be sure to mount the
correct tape cartridge.
To measure uncompressed write performance (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/rmt/tps2d6nrc
To measure read performance on drive tps2d6 using the previously-written uncompressed and
compressed files:
% iocheck -r -t 20 -b 1mb /dev/rmt/tps2d6nr
% iocheck -r -t 20 -b 1mb /dev/rmt/tps2d6nr
To empty the tape:
% mt -f /dev/rmt/tps2d6 rewind
% mt -f /dev/rmt/tps2d6 weof 2
4.4.4. Linux
There are currently no known tools available to measure raw read and write I/O performance of
HPSS tape drives for Linux.
4.5. Setup Disk Drives
Verify that Ultra SCSI is enabled for all SCSI devices via smit on AIX and by the appropriate means
on non-AIX platforms.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 126