I suffered from a Munin version 2.0.10 installation that refused to update the majority of the graphs. Only the first two of a long list were being updated, the rest all ‘hung’ at the same moment.

After a little investigating, the problem surfaced:

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$ su - munin --shell=/bin/bash munin-cron
File is not a perl storable at blib/lib/Storable.pm (autosplit into blib/lib/auto/Storable/fd_retrieve.al) line 398, at /usr/lib64/perl5/vendor_perl/5.12.4/Munin/Master/Utils.pm line 362
File is not a perl storable at blib/lib/Storable.pm (autosplit into blib/lib/auto/Storable/fd_retrieve.al) line 398, at /usr/lib64/perl5/vendor_perl/5.12.4/Munin/Master/Utils.pm line 362

I started out by fixing all items the munin-check script suggested, which is always a good starting point.

It is possible to monitor fan speeds and temperatures on Dell Poweredge servers under Linux. You can achieve this by reading out the IPMI data that is available on the system.

I used the steps on this website to buffer the data gathered by IPMI to use in Cacti.

However, in addition to Cacti I also use Munin to monitor various system parameters. Wouldn’t it be nice to incorporate graphs for fan speeds and temperatures in Munin? I thought so, so I developed a way to do this.