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Is there a way on a RHEL server to blacklist external hard drives from SNMP configuration so that if and external HD fills up, SNMP doesn't 'detect' it.

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This depends on your SNMP daemon (and which MIB you're using).

If you're using net-snmp and the Host Resources MIB: No.
Host Resources polls all attached storage devices - there's no way I'm aware of to change its list.

If you're using net-snmp and the disk configuration directive: Yes.
Simply don't list drives you don't want to poll.

If you're using some other SNMP daemon: You're on your own :-)

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