I guess Steve is still sleeping :)
Hope you don't mind I chime in.
First of all: there's a good chance your bash will suffer from the same
problem.
It has to do with signed integers. Adding one to 2147483647 results
in -2147483648. The next number is -2147483647, then -2147483646, and so on.
Steve suggested you look at the hexadecimal representation of those numbers.
You will notice it is .... 0x7FFFFFFF, 0x80000000, 0x80000001 and so on.
To convert the numbers to positive numbers, too large to fit in a 32-bit
signed integer, just add 4294967296. Your shell may not be able to handle
this, just try bc.
----- Original Message -----
From: "Christian Arnaut" <[email protected]>
To: "Steve Shipway" <[email protected]>
Cc: <[email protected]>
Sent: Wednesday, November 26, 2014 3:50 PM
Subject: Re: [mrtg] SNMP Disk Space Negative Values
Steve,
Pardon my ignorance. How were you able to convert the 'signed' integer
of -268468737 to an unsigned value of 4026498559? If I can do that with a
bash script, I'm halfway home!
Thanks,
~Christian
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: RE: [mrtg] SNMP Disk Space Negative Values
Date: Tue, 25 Nov 2014 22:46:58 +0000
Your E: drive is insanely huge at 15TB. Possibly something is using signed
integers when it should be using unsigned… The -268468737 value is a signed
representation for the unsigned integer 4026498559 (convert to hex and get
0xEFFF7DFF in both cases); multiply the unsigned value by the cluster size
and you get your 15TB. Something is using an unsigned integer when it
should be signed, or vice-versa. Steve Steve [email protected]
From: mrtg [mailto:[email protected]]
On Behalf Of Christian Arnaut
Sent: Wednesday, 26 November 2014 11:05 a.m.
To: [email protected]
Subject: [mrtg] SNMP Disk Space Negative Values Am attempting to use MRTG to
monitor disk space on a Windows Server as I have done on multiple servers
and workstations in the past. However, this time the local storage capacity
on the local drive partition is nearly 15TB.
It appears that I have exceeded an SNMP threshold where the integer values
are now negative numbers. For example to monitor total space on the C: drive
I used (simplified)... iso.3.6.1.2.1.25.2.3.1.4.2 *
iso.3.6.1.2.1.25.2.3.1.6.2
iso.3.6.1.2.1.25.2.3.1.3.2 = STRING: "C:\\ Label:"
iso.3.6.1.2.1.25.2.3.1.3.4 = STRING: "E:\\ Label:"
iso.3.6.1.2.1.25.2.3.1.4.2 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.4.4 = INTEGER: 4096
iso.3.6.1.2.1.25.2.3.1.5.2 = INTEGER: 10350335
iso.3.6.1.2.1.25.2.3.1.5.4 = INTEGER: -268468737
iso.3.6.1.2.1.25.2.3.1.6.2 = INTEGER: 6261795
iso.3.6.1.2.1.25.2.3.1.6.4 = INTEGER: -527400222
With the E: drive, iso.3.6.1.2.1.25.2.3.1.4.4 correctly shows the cluster
size (4096). However, I am sure the total number of clusters isn't
'-527400222'. Even if I used the absolute value of 527400222, the numbers
don't add up to the 15TB partition size.
Any suggestions? Or have I reached the limitation of MRTG for the purpose I
am looking for?
Thank you, in advance, for any assistance!
~Christian
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