netsnmp-5.4.2.1 and Solaris 10/X86 with ZFS

I have built a rather stock netsnmp-5.4.2.1 for our environment, and now 
the local EM7
guy is complaining that our ZFS file system isn't getting monitored like 
it should.

Here's the basics from the snmpd.conf file:

disk /backup 95%
disk /opt 99%

After restarting snmpd, I get the following response:

# snmpwalk -v 2c -c localhost localhost dsk

UCD-SNMP-MIB::dskIndex.1 = INTEGER: 1
UCD-SNMP-MIB::dskIndex.2 = INTEGER: 2
UCD-SNMP-MIB::dskPath.1 = STRING: /backup
UCD-SNMP-MIB::dskPath.2 = STRING: /opt
UCD-SNMP-MIB::dskDevice.1 = STRING: backup
UCD-SNMP-MIB::dskDevice.2 = STRING: /dev/md/dsk/d50
UCD-SNMP-MIB::dskMinimum.1 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.2 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.1 = INTEGER: 95
UCD-SNMP-MIB::dskMinPercent.2 = INTEGER: 99
UCD-SNMP-MIB::dskTotal.2 = INTEGER: 43705672
UCD-SNMP-MIB::dskAvail.2 = INTEGER: 42299632
UCD-SNMP-MIB::dskUsed.2 = INTEGER: 968983
UCD-SNMP-MIB::dskPercent.2 = INTEGER: 2
UCD-SNMP-MIB::dskPercentNode.2 = INTEGER: 0
UCD-SNMP-MIB::dskErrorFlag.2 = INTEGER: error(1)
UCD-SNMP-MIB::dskErrorMsg.2 = STRING: /opt: less than 99% free (= 2%)


The df -k from the system in question looks like:


Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/md/dsk/d10        2058319    151311   1845259   8% /
swap                   8340536      1232   8339304   1% /etc/svc/volatile
/dev/md/dsk/d60        8262869   4078888   4101353  50% /usr
/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1
                       2058319    151311   1845259   8% 
/platform/sun4u-us3/lib/libc_psr.so.1
/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
                       2058319    151311   1845259   8% 
/platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
/dev/md/dsk/d30        8262869   1433292   6746949  18% /var
swap                   8340888      1584   8339304   1% /tmp
swap                   8339360        56   8339304   1% /var/run
/dev/md/dsk/d50       43705673    968983  42299634   3% /opt
/dev/md/dsk/d40        4133838    714268   3378232  18% /var/home
backup               5615091147 3480248897 2134842251  62% /backup


Seems like netsnmp isn't able to deal correctly with space on Solaris/ZFS.

Am I wrong?

Thanks,.

Ben

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