4.5.1. AIX
•Verify that the correct number and type of disk devices are available on each DB2 and Disk
Mover node.
The disk devices section of the lsnode report displays all available disk devices.
To determine the type and number of available disk devices:
% lsdev -C -S a -c disk
•If using SSA disks spread the SSA disks equally across the two loops on each SSA adapter.
The SSA configuration section of the lsnode report provides details on the SSA
configuration.
Note the following:
•The section shows which SSA adapter to which each disk is attached.
•There are two loops (a and b) per adapter and two ports per loop (a1, a2, b1, b2)
•The physical order of the disks are shown from the perspective of each port
•A disk is accessed according to its closest port (e.g., either a1 or a2, b1 or b2)
•When configuring striped SSA disks in HPSS, it is important to select disks for each
striped virtual volume that span ports, loops, and/or adapters. These decisions can be
made after determining the probable bottlenecks and then selecting individual disks in
a virtual volume to alleviate bottlenecks in the port, loop, or adapter, as desired.
•For SSA disks on an AIX SP node, use maymap to identify which loop the SSA disk
is on.
•Create volume groups for all disks to be used by HPSS.
•Create all necessary raw disk logical volumes to be used by the HPSS Disk Mover(s).
To create a volume group for a physical disk, use smit or the following:
% mkvg -f -y<volumeGroup> -s<partitionSize> <physicalDisk>
To create a logical volume, use smit or the following:
% mklv -y<logicalVolume> -traw <volumeGroup> <numPartitions>
Note that there are additional options for specifying exactly where on the physical disk the
logical volume should be placed.
To view all physical disks and associated volume groups:
% lspv
To view all logical volumes on a given volume group:
% lsvg -l <volumeGroup>
•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 tests should be stored in /var/hpss/stats for l ater analysis.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 127