Re: ERROR: could not setup extent tree

[Jean-Denis Girard <jd.girard@sysnux.pf>]

Le 12/11/2020 à 12:55, Chris Murphy a écrit :
> Hypothesis: The NVMe drive has had some kind of failure, and since
> this single NVMe is used as cache for both HDDs, in effect this
> thwarts the raid1 protection of Btrfs. i.e. you don't have complete
> hardware isolation by having dedicated SSD's to use as cache for each
> HDD. Something went wrong, and it's adversely affected the writes to
> both drives. Btrfs is reporting write errors for both bcache0 and
> bcache1 at the same time.

ok, it makes sense, so I made a mistake with this setup...

> I don't know for sure what the next step is, so my strong advice is to
> make no changes until the problem and path forward is well understood.
> The more things are changed at this point, the greater the likelihood
> of non-recovery. Importantly, I'd say whatever you do should be
> reversible, until you get superior advice.

I restored from backups on a different HDD, so the original setup has 
not been touched.

> You might consider reposting or cross-posting on the bcache list and
> see if they have some advice for recovery, or maybe it's safer to just
> decouple bcache, and once the HDDs are freed to see if Btrfs can
> recover on its own.

Good idea, I'll also post on bcache list.


Thanks for your reply Chris!

Best regards,
-- 
Jean-Denis Girard

SysNux                   Systèmes   Linux   en   Polynésie  française
https://www.sysnux.pf/   Tél: +689 40.50.10.40 / GSM: +689 87.797.527