Re: RAID5 up, but one drive removed, one says spare building, what now?

[Phil Turmel <philip@turmel.org>]

Hi Jun-Kai,

{Convention on kernel.org is to trim replies and avoid top-posting.}

On 11/10/2017 12:25 PM, Jun-Kai Teoh wrote:
> I was reshaping/growing my array when it died. Computer came back up
> but array wouldn't assemble.
> 
> I looked around and saw some commands on how to assemble without the
> one drive that looked like it was kicked off sometime ago that I did
> not realize (I used --assemble --force --verbose)
> 
> I kept getting the error that there were 6 drives, 1 rebuilding, and
> not enough to get the array up. I unplugged the one drive that had the
> incorrect superblock and ran "mdadm -A -R".
> 
> It ran and looked like it was resuming reshaping but it got really
> slow - like 7 years slow.
> 
> I killed the process, rebooted the machine, and it just auto
> reassembled the array and automounted it on boot.
> 
> Am in the process of backup right now.
> 
> And yes, the drive/array is mounted.

Ok.  I reviewed the other thread.  Consider creating a new array from
scratch after you complete your backups, using consistent partitioning
across all devices.  I would put LVM on top and leave part of it
unallocated (for emergencies), but that's just my preference.

Phil