RE: Failed adadm RAID array after aborted Grown operation

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

This may not be the forum to ask this but what exactly is "compiling the 
kernel". From what I've been reading, it sounds like a somewhat involved and 
complex process - is it? Is compiling a new kernel the same as upgrading the 
OS? I'm getting the impression that it sort of is but sort of isn't. Is it 
possible to compile a kernel for a rescue CD (from the comments I've read, 
it is possible)? If I were to compile a new kernel, would I expect the 
version number for the kernel and mdadm to be the same? Sorry for all the 
question but, as I said at the outset, a lot of this is all very new to me.

Thank you,
Bob

-----Original Message-----
From: Reindl Harald <h.reindl@thelounge.net>
Sent: Thursday, 12 May 2022 12:59 AM
To: Bob Brand <brand@wmawater.com.au>; Roger Heflin <rogerheflin@gmail.com>; 
Wols Lists <antlists@youngman.org.uk>
Cc: Linux RAID <linux-raid@vger.kernel.org>; Phil Turmel 
<philip@turmel.org>; NeilBrown <neilb@suse.com>
Subject: Re: Failed adadm RAID array after aborted Grown operation



Am 11.05.22 um 16:56 schrieb Reindl Harald:
>
>
> Am 11.05.22 um 15:22 schrieb Bob Brand:
>> Sorry Reindl.  I'm not sure I understand. Are you saying I did or
>> didn't do the right thing in booting from a CentOS rescue disk? At
>> the moment it's running from the rescue disk and, be it the best
>> distro to have used (or not), I would imagine that I need to keep
>> running from the rescue disk until the reshape is complete as
>> rebooting in the middle of a reshape is what got me in this mess.

and nowhere did i say reboot now

and i only responded to your "Do I understand that you would recommend 
upgrading our installation of Linux once the repair is complete or are 
advising downloading and compiling a new kernel as part of the repair?"

nobody said that - the only point was use a as recent kernel as possible 
with all rgow/reshape operations

> and i don't understand what you did not understand in the clear
> response below you got days ago!
>
> due reshape you where advised use whatever rescue/live system with a
> recent kernel and mdadm, not more and not less
>
> just to avoid probaly long fixed bugs in your old kernel
>
> ---------------------
>
> 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



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