Re: FreeBSD boot from root pool larger than 1Tb/cannot read MOS/all block copies unavailable

Reply: Stefan Esser : "Re: FreeBSD boot from root pool larger than 1Tb/cannot read MOS/all block copies unavailable"
In reply to: Eugene M. Zheganin: "FreeBSD boot from root pool larger than 1Tb/cannot read MOS/all block copies unavailable"
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From: Charles Sprickman <spork_at_bway.net>
Date: Wed, 27 Apr 2022 00:10:46 UTC

> On Apr 26, 2022, at 10:10 AM, Eugene M. Zheganin <eugene@zhegan.in> wrote:
> 
> Hello,
> 
> recently I found another server that was running 12.x and became unbootable because of the famous "cannot read MOS/all block copies unavailable/etc" gptzfsboot message which can be randomly displayed when boot blocks migrate beyond 1st Tb on a large root pool.

Is this documented somewhere? I’m pretty sure I have a number of servers that fit this description. How do boot blocks “migrate”?

Charles