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IDS Forum

Re: Network

Date: Thursday, 12 January 2012, at 4:07 p.m.

In Response To: Network (

original post:

have a query that we are running between 2 LPAR's on the same P6. Both
systems are IDS 11.70.fc3x9 and AIX 6.1. The table contains about 3.2
million rows...

database eisds01@dss_lnk;

select * from c3ods@ods_lnk:temp_event_item
into temp test_data with no log;

3+ minutes

database entods@ods_lnk;
select * from c3ods@ods_lnk:temp_event_item
into temp test_junk with no log;

8 seconds

If I do a similar query where both instances are on the same LPAR, the
time is about 1.5 minutes.

My development team doesn't think the cross server times are reasonable.
Both of these LPARS have dual fiber channel adapters (1gb). I guess the
biggest question is this a network issue, or is it informix related...and
then what if any suggestions to make it faster...

Thanks in advance ...

Peter Logan
Senior Database Administrator
Phone: 616/878-8309


Well you could set the env variable SRV_FET_BUF_SIZE to 32767 (which should be the max) and that should help as it should reduce the number of messages that need to go between the 2 servers to ship the rows back and forth. Also I think you would want to use the b=32767 sqlhosts option as well to increase the size of the network buffs, otherwise it could possibly still be broken up into multiple sends. Then on the AIX side assuming you are using VIO servers to virtualize the IO I think there have been some AIX APARS for network traffic that would be small packet sizes, which could also come into play here. I don't have the APAR number/s off the top of my head. However, I think the fastest method if you need to do cross server communication on LPARS is to have direct connects between the network adapters to take the VIO servers out of it. But without hardware changes/hardware config changes I'd try setting SRV_FET_BUF_SIZE and the b option of the sqlhosts and see how much performance that buys you. You'll need to bounce the servers for those changes to take affect, and you'd want the SRV_FET_BUF_SIZE set in the environment of the session bringing the engine online.

Jacques Renaut
IBM Informix Advanced Support
APD Team

Messages In This Thread

  • Network -- Thursday, 12 January 2012, at 12:13 p.m.
    • Re: Network
      MARK JALKIEWICZ -- Thursday, 12 January 2012, at 1:41 p.m.
      • Re: Network -- Thursday, 12 January 2012, at 1:50 p.m.
        • Re: Network
          Fernando Nunes -- Friday, 13 January 2012, at 10:45 a.m.
          • Re: Network
            Fernando Nunes -- Friday, 13 January 2012, at 10:47 a.m.
    • Re: Network
      JACQUES RENAUT -- Thursday, 12 January 2012, at 4:07 p.m.
      • Re: Network -- Thursday, 12 January 2012, at 4:23 p.m.
        • Re: Network
          JACQUES RENAUT -- Thursday, 12 January 2012, at 4:35 p.m.

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