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Perfmon monitor disk space on mount points

I have a virtual server running on an ESX 4.1 host using server 2008 64bit as an OS.This server a file server mapping our users to respective departmental shares (mount points). I am in the need to monitor the disk space on the seperate mount points and finding that our in place tool, SolarWinds performance monitoring, will not aggregate data from the mount points.We also use Insight Manager to monitor our environment on a hardware level and find that HP SIM will not monitor the mount points either.
So, I have a perfmon Data Collector setup trolling the mount points but I am not seeing an addition to the event log when one of my thresholds are met. My test is a mount point called disk_test with a threshold alarm set to 95%. When the volume falls below 95% free I expect to see an alarm, but do not.
Here is what I have:
  - Single Alert type Performance counter monitoring LogicalDisk (C:\MountPoints\disk_test)
  - Alert When: "Below"  - Limit "95"
       -trying to achieve an alert when the volume falls below 95% full. (threshold set for testing only)
  - Sample Interval:  15 seconds
  - "Log an entry in the application event log" checked
  - Start a Data collector set:  - empty
  - Alert Task - all attributes empty. ( just need an event log entry)
  - Running task as : domain admin Server Acount.
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arnold
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i am in an environment where I cannot limit space, but could use the quotas in "warn" mode only and grow the LUN when needed correct?
Yes. The warning will be on the windows side.
The expanding LUN and then running the diskpart to expand the filesystem on which those shares reside.

It is not clear whether you have a single filesystem with shares or you have individual resources/disk that are mounted as a folder versus being accessed as individual drives.

You may want to explore SNMP and see whether the storage section of the SNMPwalk reflects those mount_points as individual disks in which case you can use SNMP/nagios to monitor their usage and generate alerts when your configured thresholds are exceeded as applicable.
been awhile since I have worked with quotas, but would the quota still alarm if an administrator moved a group files into a mountpoint pushing it to an alarm status? I remember having quotas set for a volume and, being an administrator, I would move a group of files into a volume and exceed the threshold set and not get an alarm. Again, been awhile since I have worked with them.

Thanks for the help.
Yes, the file server resource manager has a setting for the total quota for the share as well as per user quota setting. So while the per user quota will not trigger an event given the administrator account often has unlimited quota or no quota set, the per share total usage quota will generate an event.