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will be used.
For Linux, a similar change should be made to /etc/nsswitch.conf:
hosts: nis dns files
• For each AIX ethernet network interface, verify that the en0 and et0 interfaces are not both
configured at the same time (we recommend only using en0 unless the other nodes in the
network are all using the 802.3 et* interface). Configure the local name service with the
unique hostname for each network interface on all nodes and verify that each hostname is
resolvable from other nodes.
• Verify that network TCP throughput has been optimized and the performance of each network
is at expected levels in both directions (especially check HPSS data networks between Movers
and between Mover and client nodes). Using ttcp or another network tool, measure the
performance of all the networks that will be used in communications between Kerberos,
HPSS, DB2, and client nodes. If multiple paths between nodes are to be used, then all of them
need to be measured as well. The transfer rates for networks differ greatly depending upon the
individual technology and network settings used. It is important to gather performance data
using a variety of settings to determine the optimal combinations. The primary values that
govern performance include send/receive buffers, size of reads/writes, and rfc1323 value for
high performance networks (HIPPI, G-Enet). Create a table showing these values. An example
table can be found below:
To test the receiving node’s performance, issue:
% ttcp -r -s -b<bsize> -l<lsize>
To test the sending node’s performance, issue:
% ttcp -t -s -b<bsize> -l<lsize> <hostname/interfacename>
The following is an example of the information to be gathered from the above commands
(assumes en0 is 10 MB Ethernet, if en0 is Fast or G-Enet, rfc1323 should be on:
Receiver Table
Interface Bsize Lsize RFC1323 Performance
CPU utilization
en0 16k 16k Off -- --
en0 16k 8k Off -- --
en0 64k 64k Off -- --
en0 64k 32k Off -- --
...
ccs0 64k 64k On -- --
ccs0 64k 32k On -- --
...
Sender Table
Interface Bsize Lsize RFC1323 Performance
CPU utilization
en0 16k 16k Off -- --
en0 16k 8k Off -- --
en0 64k 64k Off -- --
en0 64k 32k Off -- --
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 130