Nagios Support Forum

I have multiple VMWare hosts being monitored by Nagios XI & for various reasons I am monitoring the same datastore from each of them.

I've noticed that the same datastore, when checked from different hosts, is showing wildly different statistics.

VMWare Host 1:
[NAGIOSHOST ~]$ /usr/local/nagios/libexec/check_esx3.pl -H "prdoracle-esxi1.company.com" -f "/usr/local/nagiosxi/etc/components/vmware/esxi_6_auth.txt" -l "VMFS" -w 15%: -c 5%:
CHECK_ESX3.PL WARNING - Storages : 'ntap_n2_1200_SAS_ORACLE_01'(free)=438330.21 MB (6.97%), 'ntap_n1_SATA_iso'(free)=897752.47 MB (85.62%) | ntap_n2_1200_SAS_ORACLE_01=6.97%;15:;5: ntap_n1_SATA_iso=85.62%;15:;5:

[NAGIOSHOST ~]$ /usr/local/nagios/libexec/check_esx3.pl -H "prdoracle-esxi2.company.com" -f "/usr/local/nagiosxi/etc/components/vmware/esxi_6_auth.txt" -l "VMFS" -w 15%: -c 5%:
CHECK_ESX3.PL OK - Storages : 'ntap_n2_1200_SAS_ORACLE_01'(free)=2437531.50 MB (29.06%), 'ntap_n1_SATA_iso'(free)=907882.21 MB (86.58%) | ntap_n2_1200_SAS_ORACLE_01=29.06%;15:;5: ntap_n1_SATA_iso=86.58%;15:;5:

These are the same host, taken seconds apart, and they don't even agree on the total size of the volume.
If I look at the volume using VSPHERE each host reports the same space in use/free.

What am I missing?

That is very interesting. I will have to try to replicate that on our side. I'm not sure if it matters, but just in case, how is the storage hooked up to the ESXi servers? Is it like an FC connection, or iSCSI or something?

These are Netapp Luns connected to the ESXI Hosts via twinax/fiber but it’s a nfs datastore

Could you be hitting this?
The only other thing I can think of is different block size on each system:

What is the output of this command on both systems?
What is the exact version of the plugin you are running?