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Entry  Fri Jun 13 19:09:44 2014, Koji, Update, IOO, A blown fuse found on the euro card crate at 1X2 (IOO) rack. 
    Reply  Sat Jun 14 18:43:15 2014, rana, Update, IOO, MC Autolocker upgrades 
       Reply  Wed Jun 18 22:34:44 2014, ericq, Update, IOO, caget frusrtation 
Message ID: 10066     Entry time: Wed Jun 18 22:34:44 2014     In reply to: 10039
Author: ericq 
Type: Update 
Category: IOO 
Subject: caget frusrtation 

Quote:

 Somehow the caget/caput commands are really slow. I'm not sure if this is new behavior or not, but after changing values, it takes ~1-2 seconds to move on to the next command.

This is still happening. Specifically: on all of the control room computers, calls to caget display the result immediately, but then hang for five seconds (consistently five). We had also seen a situation where calls hang indefinitely on ottavia/pianosa, but a reboot "fixes" this.

Some observations:

  • Front end machines and the FB have proper caget/caput response times.
  • Control room machines have some odd ping behavior when targeting frontends/FB; namely the ping times themselves are ok, but each ping line takes quite some time to show up, which made us think that there is odd network routing issue happening with some network switch. 
  • Front ends and FB get epics from /opt/rtapps, whereas control room machines get epics from /ligo/apps, which has different contents. (Is this for Gentoo vs. Ubuntu? I don't really get why this is the case...). This means different environment setting scripts to be called, so maybe the control room machines are misconfigured in some way for the new name server?

I poked around the network settings on all of these machines, but everything seemed reasonable. Nothing was changed. Rossa and Pianosa have their network settings done through some Ubuntu GUI, but I don't know where the settings are written. I had expected their settings to be in /etc/network/interfaces; maybe we should change this to be consistent with other machines, and easier to administrate via the terminal. 

Despite all this, ezcaread is fine.

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