RE: Failed adadm RAID array after aborted Grown operation

[Bob Brand <brand@wmawater.com.au>]

OK.  I've downloaded a Centos 7 - 2009 ISO from centos.org - that seems to 
be the most recent they have.


-----Original Message-----
From: Wol <antlists@youngman.org.uk>
Sent: Monday, 9 May 2022 8:16 AM
To: Bob Brand <brand@wmawater.com.au>; linux-raid@vger.kernel.org
Cc: Phil Turmel <philip@turmel.org>
Subject: Re: Failed adadm RAID array after aborted Grown operation

How old is CentOS 7? With that kernel I guess it's quite old?

Try and get a CentOS 8.5 disk. At the end of the day, the version of linux 
doesn't matter. What you need is an up-to-date rescue disk.
Distro/whatever is unimportant - what IS important is that you are using the 
latest mdadm, and a kernel that matches.

The problem you have sounds like a long-standing but now-fixed bug. An 
original CentOS disk might be okay (with matched kernel and mdadm), but 
almost certainly has what I consider to be a "dodgy" version of mdadm.

If you can afford the downtime, after you've reverted the reshape, I'd try 
starting it again with the rescue disk. It'll probably run fine. Let it 
complete and then your old CentOS 7 will be fine with it.

Cheers,
Wol

On 08/05/2022 23:04, Bob Brand wrote:
> Thank Wol.
>
> Should I use a CentOS 7 disk or a CentOS disk?
>
> Thanks
>
> -----Original Message-----
> From: Wols Lists <antlists@youngman.org.uk>
> Sent: Monday, 9 May 2022 1:32 AM
> To: Bob Brand <brand@wmawater.com.au>; linux-raid@vger.kernel.org
> Cc: Phil Turmel <philip@turmel.org>
> Subject: Re: Failed adadm RAID array after aborted Grown operation
>
> On 08/05/2022 14:18, Bob Brand wrote:
>> If you’ve stuck with me and read all this way, thank you and I hope
>> you can help me.
>
> https://raid.wiki.kernel.org/index.php/Linux_Raid
>
> Especially
> https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn
>
> What you need to do is revert the reshape. I know what may have
> happened, and what bothers me is your kernel version, 3.10.
>
> The first thing to try is to boot from up-to-date rescue media and see
> if an mdadm --revert works from there. If it does, your Centos should
> then bring everything back no problem.
>
> (You've currently got what I call a Frankensetup, a very old kernel, a
> pretty new mdadm, and a whole bunch of patches that does who knows what.
> You really need a matching kernel and mdadm, and your frankenkernel
> won't match anything ...)
>
> Let us know how that goes ...
>
> Cheers,
> Wol
>
>
>
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