IBM HPSS manual Setup Disk Drives, Hpss Installation Guide July Release 6.2 Revision 126

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