... | 64k | 64k | On | ||
ccs0 | |||||
ccs0 | 64k | 32k | On | ||
... |
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You are looking for the best values possible for each network connection. These values will be used by HPSS to optimize its data transfers. This example is, by no means, a complete picture of what controls network performance. In fact, it is assumed that you have already optimized the networks. The reason for gathering these values is to optimize HPSS performance on an already tuned network, not to fix underlying network problems.
To test the TCP socket performance over a network connection, issue the following on the receiving node:
% ttcp -r -s -p<port>
where a typical port is 4321. Then issue the following on the transmitting node:
% ttcp -t -s -p<port> <hostname>
Note that the ttcp tool is included in the deployment package and is not related to the UNIX ToolTalk service.
HPSS makes extensive use of a system’s networking capabilities. Therefore, the setting of the tunable networking parameters for the systems on which the various HPSS servers and clients will run can have a significant impact on overall system performance.
AIX provides a utility program to display and modify a number of networking parameters. The utility is no (Network Options). Refer to the AIX Performance Tuning Guide, for details of each option and its impact on networking and system performance.
Some options that typically impact performance within an HPSS system environment are:
| Table 8. Network Options | |
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Network Option |
| Description |
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thewall |
| Controls the maximum amount of system |
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| memory that can be used by the system |
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| networking code. A value that is too low can |
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| cause networking requests to be delayed or |
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| denied. The recommendation from AIX |
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| development is to set this value to at least two |
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| times the maximum number of concurrent |
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| connections times the size of the socket |
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| send/receive buffers. The default setting for AIX |
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| 4.3.2 and later is the smaller of (1) half the size |
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| of physical memory or (2) 1 GB. |
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|
|
sb_max |
| Controls the maximum size allowed for send and |
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| receive buffers for a socket. |
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HPSS Installation Guide | July 2008 |
Release 6.2 (Revision 2.0) | 131 |
