Thanks for the reply, it's appreciated!
> Mounting raid1 btrfs writable in degraded mode creates chunks with
> single profile. This is long standing issue. What is rather surprising
> that you apparently have chunk size 819GiB which is suspiciously close
> to 10% of 8TiB. btrfs indeed limits chunk
I'm running Ubuntu 21.04 (technically not a stable "release" yet, but
it will be in a few days, so if this is an ubuntu specific issue I'd
like to report it before it is!).
The btrfs volume in question is two 8TB hard disks that were in RAID1
at the time the filesystem was created. Kernel version
My understanding is btrfs will perform poorly with use cases such as
large databases that have a large amount of random reads/writes. As
such, the nocow attribute is usually suggested to allow overwriting to
help reduce fragmentation that would otherwise occur (bearing in mind
the downsides of usin
