Discrepancy in df output and the output from cdm probe in UIM for disk usage information

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

Discrepancy seen in df output and the output from cdm probe in UIM for disk usage information

Environment

Release: CNMSPP99000-8.47-Unified Infrastructure Mgmt-Server Pack-- On Prem
Component:

Resolution

• Ø  CDM probe using the system call statvfs() to get the file system space and probe is calculating the used space by using below formula:

% Used = (f_blocks- f_bavail)*100/ f_bsize.

 

• Ø  Please note that unix systems report disk available to users instead of disk available to system/root user. Because Unix systems typically reserve a percentage of the disk for system use.

 

• Ø  We have a raw config option “use_systemspace” which by default in set to no. use_systemspace = no, means the system space will not be included in Free disk space shown by probe and vice versa. 

 

• Ø  This may cause the information displayed by CDM probe to differ from that displayed by the 'df -h' command! This can be overridden by using key 'use_systemspace=yes' in the disk section of the config file. This flag does not have any effect on Windows systems.

 

• Ø  If  facing this issue than there is a possibility that “use_systemspace” is no in environment. Please check key “use_systemspace” in cdm probe CFG .

• Ø  With key "use_systemspace = YES" 

%used = (f_blocks- f_bfree)*100/ f_bsize.