How free space in Linux machine is calculated by rsp probe and why df command on the Linux machine used by rsp does not match the probe output in alarms?

Document ID : KB000014692
Last Modified Date : 14/02/2018
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Question:

1)How free space in Linux machine is calculated by rsp probe?

2)Why command /bin/df -P -k -l on the Linux machine used by rsp does not match the probe output in alarms?

Answer:

Free space is calculated by rsp probe by "df" command, simply we subtract from (size_mb - used_mb) then we get free space. 

"df" command tells you the amount of free space on all mounted file system or specified file system. In "df" command file system reserve some percentage of memory for the root user, so it is showing less available space under "Available" section. 

There is some difference between Available and free memory. 

free memory = Total memory - used memory. 

 

Available Memory = Total memory - used memory - reserve percentage of memory(for root user).