I'd like to collect filesystem space information using SNMP on Solaris 10 and Ubuntu 11.10. The problem is that SNMP doesn't seem to have an attribute that corresponds to the "Available" column in
For example, here is the
df -k output of my local filesystem:
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdb1 36841040 13489312 21480268 39% /
And here are the relevant attributes from the SNMP daemon (as per the Net-SNMP documentation):
HOST-RESOURCES-MIB::hrStorageDescr.31 = STRING: / HOST-RESOURCES-MIB::hrStorageSize.31 = INTEGER: 9210260 HOST-RESOURCES-MIB::hrStorageUsed.31 = INTEGER: 3372328 HOST-RESOURCES-MIB::hrStorageAllocationUnits.31 = INTEGER: 4096 Bytes
9210260*4 = 36841040, and
3372328*4 = 13489312, which match the columns in the
df output. However, I can't see any attribute that corresponds to the "Available" column. Note that it's not just a matter of subtracting the two columns - the "Available" column seems to take into account some hidden overheads which vary per filesystem.
Is there a way to collect or calculate the "Available" column information using SNMP?