On 31/03/2022 19:14, Bruce Korb wrote:
On Thu, Mar 31, 2022 at 10:06 AM Wols Lists <antlists@xxxxxxxxxxxxxxx> wrote:
On 31/03/2022 17:44, Bruce Korb wrote:
I moved the two disks from a cleanly shut down system that could not
reboot and could not
be upgraded to a new OS release. So, I put them in.a new box and did an install.
The installation recognized them as a RAID and decided that the
partitions needed a
new superblock of type RAID-0.
That's worrying, did it really write a superblock?
Yep. That worried me, too. I did the command to show the RAID status of the two
partitions and, sure enough, both partitions were now listed as RAID0.
Since these data have never been
remounted since the
shutdown on the original machine, I am hoping I can change the RAID
type and mount it
so as to recover my. .ssh and .thunderbird (email) directories. The
bulk of the data are
backed up (assuming no issues with the full backup of my critical
data), but rebuilding
and redistributing the .ssh directory would be a particular nuisance.
SO: what are my options? I can't find any advice on how to tell mdadm
that the RAID-0 partitions
really are RAID-1 partitions. Last gasp might be to "mdadm --create"
the RAID-1 again, but there's
a lot of advice out there saying that it really is the last gasp
before giving up. :)
https://raid.wiki.kernel.org/index.php/Asking_for_help
Sorry about that. I have two systems: the one I'm typing on and the one
I am trying to bring up. At the moment, I'm in single user mode building
out a new /home file system. mdadm --create is 15% done after an hour :(.
It'll be mid/late afternoon before /home is rebuilt, mounted and I'll be
able to run display commands on the "old" RAID1 (or 0) partitions.
Especially lsdrv. That tells us a LOT about your system.
Expect email in about 6 hours or so. :) But openSUSE doesn't know
about any "lsdrv" command. "cat /proc/mdstat" shows /dev/md1 (the
RAID device I'm fretting over) to be active, raid-0 using /dev/sdc1 and sde1.
Well, the webpage does tell you where to download it from - it's not
part of the official tools, and it's a personal thing that's damn useful.
What was the filesystem on your raid? Hopefully it's as simple as moving
the "start of partition", breaking the raid completely, and you can just
mount the filesystem.
I *think* it was EXT4, but. it might be the XFS one. I think I let it default
and openSUSE appears to prefer the XFS file system for RAID devices.
Definitely one of those two. I built it close to a decade ago, so I'll be moving
the data to the new /home array.
What really worries me is how and why it both recognised it as a raid,
then thought it needed to be converted to raid-0. That just sounds wrong
on so many levels. Did you let it mess with your superblocks? I hope you
said "don't touch those drives"?
In retrospect, I ought to have left the drives unplugged until the install was
done. The installer saw that they were RAID so it RAID-ed them. Only it
seems to have decided on type 0 over type 1. I wasn't attentive because
I've upgraded Linux so many times and it was "just done correctly" without
having to give it a lot of thought. "If only" I'd thought to back up
email and ssh.
(1.5TB of photos are likely okay.)
Thank you so much for your reply and potentially help :)
If it says the drive is active ...
When you get and run lsdrv, see if it finds a filesystem on the raid-0 -
I suspect it might!
There's a bug, which should be well fixed, but it might have bitten you.
It breaks raid arrays. But if the drive is active, it might well mount,
and you will be running a degraded mirror. Mount it read-only, back it
up, and then see whether you can force-assemble the two bits back
together :-)
But don't do anything if you have any trouble whatsoever mounting and
backing up.
Cheers,
Wol
