Problem with Win32_PerfRawData_PerfDisk_PhysicalDisk

[Cylindric]

Hello,

I'm using the wmi.php script from somewhere on these forums (sorry, I can dig out the info if needed) and seem to be having some problems with the numbers received.

I have one script for LogicalDisk stats, and one for PhysicalDisk stats. The logical one is fine, and prints nice numbers for queues and iops. The physical one shows huge (really!) numbers.

Here's an example on one of my DC's:

the Logical Disk data source executes this PHP:

Code: Select all

/usr/bin/php -q /usr/share/cacti-0.8.7d/scripts/wmi.php 
-h '192.168.1.201' 
-u '/etc/cacti/cactiwmi.pw' 
-w 'Win32_PerfRawData_PerfDisk_LogicalDisk' 
-k 'Name' 
-v 'C:' 
-c 'DiskWritesPersec,DiskWriteBytesPersec,DiskReadsPersec,DiskReadBytesPersec,CurrentDiskQueueLength'

and it returns:

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output: 
CurrentDiskQueueLength:0
DiskReadBytesPersec:60407738368
DiskReadsPersec:1773664
DiskWriteBytesPersec:265465877504
DiskWritesPersec:12907286

The graph then looks like this:

the Physical Disk data source executes this PHP:

Code: Select all

/usr/bin/php -q /usr/share/cacti-0.8.7d/scripts/wmi.php 
-h '192.168.1.201' 
-u '/etc/cacti/cactiwmi.pw' 
-w 'Win32_PerfRawData_PerfDisk_PhysicalDisk' 
-k 'Name' 
-v '0 C: D:' 
-c 'DiskWritesPersec,DiskReadsPersec,AvgDiskReadQueueLength,AvgDiskWriteQueueLength'

and it returns:

Code: Select all

output:
AvgDiskReadQueueLength:76468935000
AvgDiskWriteQueueLength:108384954000
DiskReadsPersec:1778786
DiskWritesPersec:13555491
Name:0 

The graph then looks like this:


I'm stumped.

[BSOD2600]

graph and/or data templates are obviously different. Compared the graph debug and data source debug outputs of both of those? One looks like it's using GAUGE and the other COUNTER.

[Cylindric]

Sorry all, this was a comedy of erros on my part.

The first two counters for bytes read and written are of course indeed Counters, and not Gauages! Ignore my ignorant fumblings.

The last one is a bit of an odd case, in that the WMI Win32_PerfRawData_PerfDisk_PhysicalDisk counter "CurrentDiskQueueReadLength" and "CurrentDiskQueueWriteLength" are indeed Guages, but seem to have an odd scale.

Watching a counter in Perfmon for one example server gives values between things such as 0.003 and 5.211. Pulled in via the WMI script though (so I guess the "raw" counters) give values a little higher than this.

Turns out I have to divide by 10,000,000 to get values that match Perfmon.


(note: the gprinted values are divided by 10^7 to give real numbers, but the line is divided by 10^6 just to make it more visible on the graph)

Now there's a server that needs replacing

My next challenge is to combine all my servers' read- and writes-per-second onto one huge stacked graph to give my enterprise-wide IOP/S figure. Should just be able to use Aggregate, but I'm having trouble with that - might reinstall the plugin...

[BSOD2600]

Nice lookin' graph and well though out arrangement. Just might have to look into using it . One suggestion would be to use the alpha blending features of rrdtool 1.2.

[decibel83]

Hi Cylindric,
which graph template are you using?
If it's self-made, would you share it on the forum, please?

Thank you very much!