snmp agent - incorrent disk percentage values

[Rectifier]

I'm getting different values from snmpwalk and df... around 3% different on partition. Any idea what is wrong with snmp?

$ snmpwalk -v 2c -c public localhost dskPercent
UCD-SNMP-MIB::dskPercent.1 = INTEGER: 43
UCD-SNMP-MIB::dskPercent.6 = INTEGER: 0
UCD-SNMP-MIB::dskPercent.8 = INTEGER: 0
UCD-SNMP-MIB::dskPercent.9 = INTEGER: 0
UCD-SNMP-MIB::dskPercent.28 = INTEGER: 16
UCD-SNMP-MIB::dskPercent.29 = INTEGER: 3
UCD-SNMP-MIB::dskPercent.30 = INTEGER: 0
UCD-SNMP-MIB::dskPercent.31 = INTEGER: 13
UCD-SNMP-MIB::dskPercent.32 = INTEGER: 0

$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg-root 7.8G 3.4G 4.0G 46% /
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 8.9M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/sda1 976M 153M 757M 17% /boot
/dev/mapper/vg-var_log 7.8G 253M 7.1G 4% /var/log
/dev/mapper/vg-tmp 2.0G 7.5M 1.8G 1% /tmp
/dev/mapper/vg-home 2.0G 264M 1.6G 15% /home
tmpfs 1.6G 0 1.6G 0% /run/user/6030

Thank you.

[LenR]

Some filesystems reserve space for root only use. DF may reflect that, snmp may not.

[Rectifier]

oh thanks for your feedback. Is there any way how to fix that?

[LenR]

Those file systems have a way to remove or change the reserve percentage, it would take root access. You could also use pre-processing in zabbix to add a fudge factor to make them read the same. There is also some issue with sample interval if the values are changing enough to notice. I think I've seen snmp return values that are somewhat outdated. Personally, I just don't sample both methods on the same server, pick one and live with it. If you're living within 3% of the edge, it's not that safe with either value :-)

[Rectifier]

I don't wanna change reserve space for root. Is there any way to handle this?