Chapter 3 System Preparation
HPSS Installation Guide September 2002 155
Release 4.5, Revision 2
Tomeasureuncompressed write performance (see warning below) on st1 (Note that specifying nst1
will cause the tape not to rewind):
% iocheck -w -t 20 -b 1mb /dev/rmt/nst1
To measure the maximum-compressed write performance on st1 (and then rewind the tape):
% iocheck -w -t 20 -f 0 -b 1mb /dev/nst1
To measure read performance on drive st1 using the previously-written uncompressed and
compressed files:
% iocheck -r -t 20 -b 1mb /dev/nst1
% iocheck -r -t 20 -b 1mb /dev/nst1
To empty the tape:
% mt -f /dev/st1 rewind
% mt -f /dev/st1 weof 2
WARNING: The contents of this tape will be overwritten so be sure to mount the correct tape
cartridge.
3.6 Setup Disk Drives
Verifythat Ultra SCSI is enabled for all SCSI devices via smit on AIX and by the appropriate means
on non-AIX platforms.

3.6.1 AIX

Verifythat the correct number and type of disk devices are available on each SFS and Disk
Mover node.
The disk devices section of thelsnode report displays all available disk devices.
To manually find out the type and number of available disk devices:
% lsdev -C -S a -c disk
If using SSA disks, on each appropriate Disk Mover spread the SSA disks equally across
the two loops on each SSA adapter.
The SSA configuration section of thelsnode report provides details on the SSA
configuration.
Note the following:
The section shows which SSA adapter to which each disk is attached.