I created two custom scripts, partly because I wanted to know how to do it, and partly because I have not seen anything that does quite what I was looking for. One of our DBAs wrote some SQL code that connects to a database to check it is up, in addition to my normal checking for pmon and other key processes using 'procs'. That works just the way it should.
I have also had a few problems with a switch being reset or individual ports acting strangely which caused some of my servers to drop from 100Mbit full duplex to 100-half, or even to 10-full. Because this affects LAN performance, especially remote backups using NetBackup master/client configs, I want to know if any servers switch from 100-full.
I found some inconsistencies between my RedHat AS 2.1, AS 3, and Fedora Core 3 and 4 servers because of different LAN adapters. mii-diag, mii-tool and ethtool are on all of my servers, and tend to give different results. I ended up trusting mii-diag more than ethtool but ethtool is the only one that runs on a few servers. I wrote an extension which sends me a yellow alert if any card drops from 100-full, or red if a card is not responding. Of course the card not responding is only useful if I have more than one LAN adapter configured, and I'll probably get other alerts anyway. Does anybody have a better (or for that matter any other) way of testing LAN card settings? Are there any other Linux tools than mii-diag, mii-tool and ethtool? Ideally, one program that can understand all devices rather than me having to use different ones on different servers.
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