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Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I just use the built-in email function that comes with mdadm. If a drive fails, I'll know right away and replace it with a spare. You do need your server to be able to send emails with something like postfix.
If you have hardware RAID, there's often a monitoring tool that comes with it or at the very least a command-line utility that can report the RAID state which you can then use in a script.