If you are booting from a Linux RAID1 array, can you just power it off, replace the drive and it boots up and starts rebuilding?

And now it passed a test. Wtf

@matrix in theory it should, it just depends on implementation
giving it a try should be fine as long as you have atomic writes

@matrix worst case you lose a few writes but if it's critical writes they will be attempted multiple times usually

@caskd I think you need to add the drive to the array

@matrix if it is software raid, yes

@matrix not sure about booting from it but once you boot with a degraded array you add the new device and it should start rebuilding

@matrix It's almost dead but I guess it kind of works occasinally for long enough to pass the self-assessment test

@matrix https://raid.wiki.kernel.org/index.php/Replacing_a_failed_drive

assuming you're using mdadm

@matrix
NO!

You need to at least add the new disk to the array.

@matrix Lol, something went wrong, we don't know what it is. Sounds like you have "enterprise" SSDs installed