monitor free space on ntfs volume without drive letter? (common in hyper-v clusters)

[Furnish, Trever G]

Anyone have a good way of monitoring the free space in a hyper-v cluster shared volume (CSV)?  They don't show up in the hrStorage area in SNMP.  Anyone know how to find them in SNMP, or by using some other approach (maybe SNMP+WMI?)?

There's an example below for anyone not familiar with junction points.

Any help greatly appreciated.

--
Trever Furnish, tgfurnish at herffjones.com


CSVs are mounted using junction points, which is to say they're mounted "the unix way", in a folder mount point, not with a drive letter.

If you have access to a hyper-v cluster using CSVs, you can see this easily.  Here's what it looks like in Windows Storage Manager:
http://screencast.com/t/qQTja24lP

...and here's what it looks like in the failover cluster manager:
http://screencast.com/t/8z37yWLcuspI

It's easy to make one of these without clustering too - just stick in a thumb drive and in storage manager take away the drive letter and mount it on a folder just like you would in unix.

As long as it's got a drive letter, it shows up under hrStorage in SNMP - without a drive letter, I haven't found it yet.



The rest of this is just stream-of-research notes.  Hope it helps someone else who finds this later, but so far I don't have a solution.

I've installed Windows 2008's "SNMP WMI Provider" (Under "Features" in server manager), but so far I haven't figured out how to use it.  I think it's actually for going the other direction - getting SNMP info into WMI, not getting WMI info into SNMP.


It looks like Powershell can find the volumes and display details about them by using Win32_Volume, but I don't have an easy way to get that into Nagios yet:


Found this Cacti post about using OpenPegasus (which HP already packages in their hardware management tools for Unix) as a wbem gateway, so maybe there's hope down this path.  I was hoping to avoid installing more software on the windows servers, but since they're all HP hardware I may be able to tap into the existing HP tools if the OpenPegasus wbem gateway is also present in the windows version of the HP Insight agents:
http://forums.cacti.net/about11752.html

There's also Zenoss's wmiclient, haven't tried that yet, but it looks like it doesn't work against win2008:
http://felimwhiteley.wordpress.com/2008/08/15/wmi-calls-from-linux/
http://blogs.balabit.com/2010/09/18/wmi-client-for-linux/


The winexe link in that article doesn't work any more, but there's source code in the openbsd ports archive here:
ftp://ftp.usa.openbsd.org/pub/OpenBSD/distfiles//winexe-source-081123.tar.bz2
More here: http://openports.se/net/winexe
And usage info here: https://lbtwiki.cern.ch/bin/view/Online/WinExe
...but this also installs its own service on the target system remotely - crap.

Hmmm...  Here's another Nagios plugin specifically for WMI:
http://www.edcint.co.nz/checkwmiplus/

...and another, older:
http://www.thibault.info/node/2


Long write-up of various approaches here: http://www.networkcircus.com/articles/20090606.html


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