4.5.1. AIX
Verify that the correct number and type of disk devices are available on each DB2 and Disk
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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.
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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.
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There are two loops (a and b) per adapter and two ports per loop (a1, a2, b1, b2)
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The physical order of the disks are shown from the perspective of each port
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A disk is accessed according to its closest port (e.g., either a1 or a2, b1 or b2)
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When configuring striped SSA disks in HPSS, it is important to select disks for each
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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
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is on.
Create volume groups for all disks to be used by HPSS.
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Create all necessary raw disk logical volumes to be used by the HPSS Disk Mover(s).
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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
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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 later analysis.
HPSS Installation Guide
Release 6.2 (Revision 2.0)
July 2008
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