zfs corruption after controller failure

[InterNetX - Juergen Gotteswinter]

-T is an undocumentated and so for it should be considered as unstable
or even something which can easily break things. theres a reason why its
not documentated very likely.

dl;dr - its something i whouldnt touch...

What Output do you get from a simple zpool import ? You did everything
you tried until now with "readonly=on" ?

If everything seems to be broken, you could give the zfs forensic
scripts a try... its already broken, cant get worse anymore.

Am 06.01.2015 um 16:11 schrieb Fervent Dissent:
> I tried these, and some variations of them, and it gave the error the
> pool does not exist.
> zpool import -N -o readonly=on -f -R /pool <pool>
> zpool import -N -o readonly=on -f -R /pool -F -T <transaction_id> <pool>
> 
> On Tue, Jan 6, 2015 at 11:08 PM, InterNetX - Juergen Gotteswinter
> <jg at internetx.com <mailto:jg at internetx.com>> wrote:
> 
>     > external usb drive (for sure cheap consumer desktop one)
>     > cheap (maybe even buggy) usb controller
>     > non-mirrored / raidz
>     > probably cheap hardware at all (no ecc, like rainer mentioned for example)
> 
>     what do you expect. zfs is very tolerant, but some basics should be
>     taken care of...
> 
>     but even with a single disk it should be possible to recover / import
>     the pool at least read only
> 
> 
> 
>     Am 06.01.2015 um 16:06 schrieb Fervent Dissent:
>     > I've had power lose before and a previous bad controller cause
>     multiple
>     > problems. The drive would disappear or go offline. I would clear
>     it and go
>     > on no problem. This is the first failure that I have not been able to
>     > recover from.
>     >
>     > On Tue, Jan 6, 2015 at 11:01 PM, Rainer Duffner
>     <rainer at ultra-secure.de <mailto:rainer at ultra-secure.de>>
>     > wrote:
>     >
>     >>
>     >>> Am 06.01.2015 um 15:58 schrieb Fervent Dissent <
>     >> walkerindarkness at gmail.com <mailto:walkerindarkness at gmail.com>>:
>     >>>
>     >>> I have a external disk that was on a cheap usb controller, that
>     >> controller
>     >>> died.
>     >>
>     >>
>     >> Maybe I’m mistaken, but I though that if your pool only has a
>     single disk
>     >> and that disk/pool shows errors or becomes
>     unreadable/corrupted/whatever
>     >> you cannot recover it.
>     >>
>     >> Same for not using ECC memory…
>     >>
>     >>
>     >>
>     >>
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>