[GLLUG] Link two RAIDs in one LVM?

[Andy Smith]

Hello,

On Sun, May 10, 2020 at 10:03:32PM +0200, Dr. Axel Stammler via GLLUG wrote:
> On Sun 2020-05-10 08.53.16, James Courtier-Dutton wrote:
> >So, I think moving to an "LVM mirror" solution is your best bet for
> >future extensibility.
> 
> After reviewing all options, this indeed seems to be the best one in my case.

But it still doesn't let you move filesystems that aren't on LVM
in to LVM. I don't understand why you keep thinking that LVM lets
you do this. My very first reply to you pointed out this would be an
issue for you!

Personally I do not like to do redundancy at the LVM level. The main
reason I use RAID is to avoid the system becoming unavailable (not
booting fully) when a storage device dies. It used to be the case
that an LVM Volume Group would not activate if any PVs were missing,
so if a device failed and you rebooted the system wouldn't come up
without manual intervention. They did fix that after a few years
(initramfs is now willing to activate degraded VGs):

    https://bugzilla.redhat.com/show_bug.cgi?id=1337220

So I guess my main problem with it is no longer relevant, but still,
I just prefer redundancy being provided by mdadm.

Cheers,
Andy

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