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Entry  Thu Sep 18 01:14:23 2008, rob, Summary, Computers, EPICS BAD 
    Reply  Thu Sep 18 12:16:01 2008, Yoichi, Update, Computers, EPICS BACK 
       Reply  Thu Sep 18 13:05:05 2008, Yoichi, Update, Computers, EPICS BACK 
Message ID: 963     Entry time: Thu Sep 18 12:16:01 2008     In reply to: 961     Reply to this: 964
Author: Yoichi 
Type: Update 
Category: Computers 
Subject: EPICS BACK 


Somehow the EPICS system got hosed tonight. We're pretty much dead in the water till we can get it sorted.

The problem was caused by the installation of a DNS server into linux1 by Joe.
Joe removed /etc/hosts file after running the DNS server (bind). This somehow prevented proper boot of
frontend computers.
Joe and I confirmed that putting back /etc/hosts file resolved the problem.
Right now, the DNS server is also running on linux1.

We are not sure why /etc/hosts file is still necessary. My guess is that the NFS server somehow reads /etc/hosts
when he decides which computer to allow mounting. We will check this later.

Anyway, now the computers are mostly running fine. The X-arm locks.
The Y-arm doesn't, because one of the digital filters for the Y-arm lock fails to be loaded to the frontend.
I'm working on it now.
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