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pyghmi is growing SDR, SEL, FRU, and other stuff.

I can add in-band so long as there is always python in there, however
out-of-band does not need to be too bad.  In the case of a baremetal guest,
for example, gathering such data in-band would require more cooperation of
the tenant image, whereas out-of-band should always be workable in ipmi
equipped systems.

The biggest ding in out-of-band is that ipmitool is one-to-one and also has
to retrieve SDR every time it wants to go read sensors.  pyghmi will
support an evolution of xCAT's SDR caching scheme to avoid the hit (at
least if the sensors objects are reused).  We have had success completing a
complete sensor read of 4,000 systems with a single system in about 15
seconds out of band in xCAT, and pyghmi optimizes away some overhead that
xCAT did not (though that overhead isn't as significant for something as
verbose as sensor reading).



From:	"Gao, Fengqian" <fengqian.gao at intel.com>
To:	"openstack-dev at lists.openstack.org"
            <openstack-dev at lists.openstack.org>
Cc:	Devananda van der Veen <devananda.vdv at gmail.com>, Jarrod B
            Johnson/Raleigh/IBM at IBMUS, "Lu, Lianhao"
            <lianhao.lu at intel.com>, "Wang, Shane" <shane.wang at intel.com>
Date:	11/19/2013 01:07 AM
Subject:	[Ironic] A question about getting IPMI data



Hi, all,
As                   the                   summit                   session
https://etherpad.openstack.org/p/icehouse-summit-ceilometer-hardware-sensors
 said,  ironic  will  expose  IPMI  data to ceilometer, but I have a couple
questions here.
   1.        What kind of IPMI data will be collected? I assume that power,
   temperature or other sensor data is needed, right?

   2.       How do we get all these data?

IIUC,  ironic  did  not  involve  too  much  about  IPMI for now, only used
ipmitool and pyghmi module.
Using  IPMItool  to  execute  command  and  parsing  the  output is easy to
understand.  But  seems  not  a  good  way for me. The pyghmi only supports
out-of-band(net-payload)  now.  So,  I  am  wondering  if we can extend the
function of pyghmi to provide more interfaces?
Be  specifically,  I  think  pyghmi  can  provide  in-band  IPMI  interface
including IPMB or system interface etc. and allowed to get IPMI data in the
OS.

Is all this make sense to you?

Thanks for your response

Best Regards,

-fengqian
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