Use the iocheck.ksh script from the deployment tools package to show the performance of
one or more individual disk devices and the peak aggregate performance of concurrent I/O
across multiple disks (e.g., to show the peak performance of adapters).
WARNING: The contents of this logical volume will be overwritten by iocheck so be
sure to use the correct logical volume name.
To measure the individual and aggregate throughput of hdisks 4, 5, 6, and 7:
% iocheck.ksh 4 5 6 7
To measure read performance on a single disk:
% iocheck -r -t 20 -b 1mb /dev/r<logicalVolume>
where logicalVolume is a raw logical volume that is sized to provide at least 20 seconds of I/
O throughput.
To measure write performance on a single disk:
% iocheck -w -t 20 -b 1mb -o 1mb /dev/r<logicalVolume>
where logicalVolume is a raw logical volume that is sized to provide at least 20 seconds of I/
O throughput.
4.5.2. Linux
Verify that there is a raw device mapping for each block device to be accessed by HPSS. To list all
current device mappings:
% raw -a -q
/dev/raw/raw1: bound to major 8, minor 1
/dev/raw/raw2: bound to major 8, minor 2
Block devices can be mapped to raw devices at boot time by adding mapping information to the
/etc/sysconfig/rawdevices file. To map the first partitio n of SCSI disk a to raw device raw1 and the
second partition of SCSI disk b to raw device raw2, add the following lines:
/dev/raw/raw1 /dev/sda1
/dev/raw/raw2 /dev/sdb2
4.5.3. IRIX
For Solaris and IRIX platforms, specific commands and syntax are not listed in this document.
Perform the following steps using the appropriate operating system commands:
•Verify that the correct number and type of disk devices are available on each DB2 and Disk
Mover node.
•Create all necessary raw disk volumes to be used by the HPSS Disk Mover(s).
•On each Disk Mover node, measure the raw read and write I/O performance of all HPSS disks
and verify that they are at expected levels. Create one or more tables documenting the results.
The output of these test should be stored in /var/hpss/stats for l ater analysis.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 128