I believe this should be happening for every CDM probe out there, otherwise i have a serious problem with all the Linux distros in my customer's environment (RHEL and CentOs).
CDM is reporting disk percentage used or free based on disk size alone, ignoring the fact that there is a reservation space made in linux file systems, when not specified otherwise.
This is causing some desbelief issues, as the customer stating that Zabbix is better than CA UIM in every other way, because of such simple monitoring taks not working properly.
We tried the raw configure option in CDM probe where you can type "Yes" for an option called "Use disk system values", and then you think it's fine but it isn't. It becomes clear that there is something wrong (maybe a hard coded usage %).
On low disk % you might ignore the 1% difference, but when you get disks with more used space, you'll start seeing that things are not what should be, with higher rates of % difference between the Linux System and what is being shown on CA UIM.
If there is an easy solution for that, or anyone else can confirm or help, thanks in advance.
I'll open a case for that also.
Are you using key 'use_systemspace=yes'
Discrepancy in df output and the output from cdm probe in UIM for disk usage information
Yes, we used that option called 'use_systemspace=yes', but the percentual values shown in CA UIM are still different than 'df -h', the percentage difference increases depending on your current disk usage. And there relies the main problem, because for the customer who bought the solution this is unacceptable.
I have seen that the the probe provides exact values while df command shows roundoff while showing percentage which according to development is expected .Probe is providing exact values whatever is provided the system level api’s. May be internal implementation of df does a round off.
eg / 37 % in df and 36.22 % in ump
Please explore this further on support case where additional details /logs will be required for further analysis if you see greater difference
Thx Franklin, doing that right now! I'll share the results here.
I am just curious to know if you opened a CA Ticket number for this behavior and yes, if you can share the Number.
Hi Alex, yes we have a ticket!
So far, the answer hasn't been too helpful at all.
See this article about disk space on Linux
Unix/Linux cdm probe reports different percentage of the disk for system use
For those interested in the solution, i've answered it in this link idea Disk usage in cdm probe on Linux