[TriLUG] System overload issues

[John Vaughters]

Brian,
 
I highly recommend reading up on sysstat and sar command. This gives you quick system stats that will point you to many problems and when they occur. With that info you can narrow in on your other logs for further information. You can find out about CPU, MEM, SWAP, I/O waits (disk), NIC . Centos usually defaults to 7 days of stats, but yo can increase that if you like.
 
My favorite sar command to view yesterday's stats:
 
sar -f /var/log/sa/sa$(date +%d -d yesterday)
 
Just type 'sar' to view today's stats.
 
Good Luck. 
 
John Vaughters
 


________________________________
From: Brian McCullough <bdmc at buadh-brath.com>
To: Triangle Linux Users Group discussion list <trilug at trilug.org> 
Sent: Friday, May 24, 2013 9:34 AM
Subject: [TriLUG] System overload issues


Once again, I come to the oracle for help.  A while ago, I asked about
troubleshooting and tuning MySQL and got some very helpful answers. I
implemented some of those answers, as well as continuing my own
research, and made some changes to the configuration.  However, the
machine is continuing to present very troubling symptoms, and so I am
back.  As you may know, I am much more of a programmer than a high-level
System Administrator, and this seems to be way beyond my pay grade ( mostly zero ).