Thus spake Michael DeMan (firstname.lastname@example.org):
> We are using Promise RAID controllers built on motherboards. These provide
> simple RAID-1 mirroring for us.
> My assumption would be that the RAID controller would respond and
> automatically detach a bad disk.
That's actually what it should do, and once already did here -- on a
4.6-STABLE box - older kernel's showed a similar behaviour. I remotely
had the impression the box hung, but maybe it had the same symptoms as
your box. What version are you using?
Anyways, I wouldn't actually recommend User-Hardware such as the
ATA-RAID-Controllers for production systems anyways.
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