Shell Tips !

With Ganglia, graphing a large number of servers has never been so easy… Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. Ganglia let you create any kind of module in C/C++ or Python. You can also use the command line tool Gmetric and then the scripting language of your choice. The problem with Gmetrics is that you can’t keep your data organized by group and it’s getting harder to poll values in an efficient way. Few months ago I needed to monitor some JMX values returned by a Java daemon.

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JETM stand for Java™ Execution Time Measurement Library, it’s an useful library to monitor your java application in a smart and easy way. Here is an overview on how to use JETM with a Spring application like in Red5.

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I had to monitor the Raid 5 status of two PE 2650 with a PERC3/Di and running under a GNU Debian. You can get the CLI tool afacli from dell website. Originally it was only available for windows or red-hat and it was necessary to tweak this stuff using Alien software for converting rpm to deb packages.

nicolas@grimm:~$ wget

http://linux.dell.com/files/aacraid/afaapps-2.6-0.tar.gz

nicolas@grimm:~$ sudo tar -Pvzxf afaapps-2.6-0.tar.gz

# Normally you should have a device afa0 created. If not, check that devicename = “aac” in the file /dev/MAKEDEV.afa then do the following step :

cd /dev

./MAKEDEV.afa afa0

More information on the Dell website : http://linux.dell.com/storage.shtml

Now that we have a running AFACLI we can do a little script for checking hourly our raid status. Main thing to know with afacli – as lot of other CLI tool – is the HELP commande. First you will have to open your device with the command open afa0 then you could check your container list, disk list etc. Due to network constraint I could only use an SSH connection, so for schedule this script I use a special user named “xfertuser” on each box for doing an SSH KEY AUTH. When my user is logon the remote box, I execute some command on AFACLI and use a simple diff on last afacli log file and the new afacli log file. Then in last step Icheck the messages log for AACRAID error messages.

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