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I understand this might be a very basic question, but I would like to know the answer to this question before accidentally losing all the data on the NAS due to multiple drive failures with the first going unnoticed because the pool is technically still up albeit degraded.

Does the value of this SNMP OID:

.1.3.6.1.4.1.50536.1.1.1.1.7.2

change whenever a disk fails? Currently the devices I'm using don't have hot-swap capability so it's a bit rough to test this. I wonder if anyone knows the answer already?

The relevant check in the template to trigger the warning appears to do this:

last(/truenas.mydomain.com/truenas.zpool.health[tank]) <> 0

What I'm wondering is if ZpoolHealth is non-zero when degraded?

Links:

aphid
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  • Does iXSystems have any documentation about this? – ewwhite Jul 21 '23 at 16:54
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    https://web.archive.org/web/20230706202507/https://www.truenas.com/docs/files/SCALE22.02Docs.pdf, page 488. Only info is instructions on how to enable snmp, and where to find the MIB (and a lot of places where MIB means mebibytes). The site I linked in the question makes the MIB more human readable, presents all the info in it. So I couldn't find such documentation with a cursory search. – aphid Aug 01 '23 at 09:02

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