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I'm not sure if this is just a quirk of how ZFS ZPL is presenting the available space, but it seems that SNMP is reporting the free space no more than 2TB higher than the used space.

This is on a mount that has no quota or reservation set, just a simple zpool create and then filling with data over time.

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The total space in that pool is actually 6TB.

I wondered if maybe it could be happening because of an integer type used in my Cacti graph template.

Any ideas?

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Are you presenting the ZFS storage via NFS? –  ewwhite May 26 '12 at 16:16
Nope this is SNMP direct to the server. Out of curiosity though, what diff would that make? –  SimonJGreen May 26 '12 at 16:35
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1 Answer

up vote 1 down vote accepted

Snmp doesn't handle ZFS correctly at all afaik. you are better off doing some scripting and extending snmp.

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Are you able to elaborate why that is? –  SimonJGreen May 28 '12 at 12:58
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