On 08/01/2013 10:23 AM, Peter Phaal wrote: > Adrian, > > The Host sFlow agent exports UUIDs (and is compatible with Ganglia 3.2+). > > http://blog.sflow.com/2011/07/ganglia-32-released.html > > The daemon relies on command utilities invoked at startup to find the > UUID (for reasons of portability that Dave mentioned). You could take a > look at the logic in the Linux Host sFlow agent startup script and turn > it into a Ganglia metric. > > http://sourceforge.net/p/host-sflow/code/413/tree/trunk/src/Linux/scripts/hsflowd > > Dave, the script uses the /usr/sbin/dmidecode command line tool. > If it can't find a valid UUID, it uses the UUID of the first local disk.
The UUID of the first disk is a completely different level of persistence than something less likely to be replaced during normal operation such as a CPU serial. But, realistically we aren't going to get something that is derived from hardware and meets everyone's definition of persistent and unique. > What > are the issues with the vendor supplied UUIDs? Are they all zeros? Not > set? Not unique? All of the above. > Do you have a better way of retrieving persistent UUIDs > to Linux systems? Part of the problem is that people have differing levels of their need for persistence AND we need something agnostic of the underlying OS and host architecture. Not everyone running ganglia is running X86/AMD64 linux. > Other operating systems provide different mechanism to read the UUID. > You can browse the Host sFlow source code for the different supported > platforms. > > Peter -Dave > > On Aug 1, 2013, at 9:20 AM, Dave Rawks <d...@pandora.com > <mailto:d...@pandora.com>> wrote: > >> Thanks for the suggestion, but dmidecode is not portable and is super >> unreliable since it depends on upstream hardware vendors setting >> reasonable values. Even running on a sample of 8-10 models of >> motherboards all from the same vendor I get vastly different results >> from dmidecode. I'd strongly discourage anybody from trying to integrate >> it into other software for anything aside from general informational use. >> >> -Dave ------------------------------------------------------------------------------ Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=49501711&iu=/4140/ostg.clktrk _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
