on 08-28-2014 11:01 PM
Hello Gurus - Does anyone out there uses the "is/use_uds = 0" parameter in any of your SAP instance? From SAP's documentation this parameter is only for Linux OS, and for AIX this parameter should be set to 0 (we are using AIX). We have had a situation in one of our dialog instance where we exhausted the number of network socket connections, particularly sapstream3303 gateway conections. SAP support has recomended a solution describe in SAP note 488036, basically setting is/use_uds = 0 (default value = 1). Does anyone out there using is/use_uds = 0 in an AIX environment? If so, did you notice any performance improvement or did the new parameter value resolved the issue ?
Please let me know.
Thanks.
Octavio
Symptom
All
Other Terms Enqueue, lock, lock table Reason and Prerequisites In the AIX operating system, the dispatcher and the message server process communicate by Unix domain sockets instead of a TCP/IP line. The maximum size of the Unix domain socket buffer is restricted to 4KB by the operating system. In the case of a large load, this can result in a buffer overflow on the system, and subsequently the symptoms described above. Solution Change the internal system communication to TCP/IP. To do this, follow the Kernel releases up to and including 6.40:steps below:
For example: The following entry exists in /etc/services for the system name C11 and system number 00: sapmsC11 3600/tcp.Therefore, the file name in this example should be /tmp/.sapstream3600 and MUST belong to the root user. |
ex
Hi Octavio,
Please check SAP note 1578475 - Checking if TCP/IP is used on AIX
The parameter is/use_uds is used to ensure TCP/IP protocol is used instead of UDP.
So as suggested in SAP note 488036 - Unable to reach central lock handler, AIX only
set the parater for is/use_uds = 0. ( implies to use TCP/IP only)
Hope this helps.
Regards,
Deepak Kori
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