Verify Tape Drives; Aix - IBM High Performance Storage System HPSS Installation Manual

For AML tape libraries:
If using an AML PVR, configure the Insert/Eject ports using the configuration files /var/hpss/
•
etc/AML_EjectPort.conf and /var/hpss/etc/AML_InsertPort.conf.
Refer to Section 5.2.8.3: AML PVR Specific Configuration of the HPSS Management Guide for more
information.

4.4. Verify Tape Drives

Verify that the correct number and type of tape devices are available on each Tape Mover node.

4.4.1. AIX

The tape devices section of the lsnode report displays all available tape drives.
To determine the type and number of available tape devices:
% lsdev -C -S a -c tape
On each Tape Mover node, verify that each tape drive has the variable-length block size
•
option enabled. The tape devices section of the lsnode report will indicate the status of each
drive.
To determine if the variable block size option is enabled, the following should return a value
of zero(0):
% lsattr -E -l <tapeDevice> -a block_size -F value
To change the device to use variable block size:
root% chdev -l <tapeDevice> -a block_size=0
If using STK drives, verify that the drive type is not incorrectly set to Generic tape drive or
•
IBM Emulation mode.
On each Tape Mover node, verify that the raw read and write I/O performance of all HPSS
•
tape drives are at expected levels. Create one or more tables documenting the results.
To conduct the read and write tests on rmt1, mount a scratch tape on rmt1 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 rmt1.1 causes the tape
not to rewind):
% iocheck -w -t 20 -b 1mb /dev/rmt1.1
To measure the maximum-compressed write performance on rmt1 (and then rewind the
tape):
% iocheck -w -t 20 -f 0 -b 1mb /dev/rmt1
HPSS Installation Guide
Release 6.2 (Revision 2.0)
July 2008
124