On Fri, 24 Dec 2021 15:38:05 +0100
cen wrote:
> I recently had to replace a bad disk in raid1 array and finding proper
> docs was not a good experience.
I've always noticed that about raid in general. Thousands of internet
pages telling you how redundant arrays protect you from disk failures
and you ought to use them. Nothing at all saying what you do when
one of those disks fail :-).
Though I have heard the claim that all you have to do is swap in
a new blank disk and power up the system and magic happens.
That was certainly the case for external RAID boxes. Some could
hot-swap a failed drive. Back when a 10G SCSI drive was a big as
you could get, we used an external RAID with two live spares.
When a drive failed, a spare came up without manual intervention.
You could then replace the failed drive while the RAID was powered
up. The only failure I recall was when the host system SCSI controller
died.