Lost pool after nas4free configuration asynchrony. [x-post]

[Karli Sjöberg]

Den 28 jun 2015 5:37 em skrev Johan PONIN <johan.ponin.pro at gmail.com>:
>
> pre-disclaimer, I sent this onto zfs-discuss before realizing it was a
> zfsonlinux ML, so I'm copying the mail here.
>
> Hi,
>
> Disclaimer, this is my first NAS, I barely know FreeBSD, have a
> computer engineer degree though and archlinux as a daily driver.
> Consider this a mostly PEBCAK story. I hope you'll read through
> nonetheless.
>
> Setup
>  - NAS4Free from a 4GB usbkey on HP N54L.
>  - 3x1TB WD Red as a vdev
>  - 1 pool, 1 dataset, raidz (single parity AFAICR).
>
> The usbkey failed, nas4free config was lost. I `dd` it onto a new 8GB
> usbkey, boot and got to the console to reset factory config to gain
> access to the webgui (I remember doing that once causing no issue with
> the zfs pools and datasets)
>
> The webgui showed no more pool/dataset, but running /etc/rc.d/zfs
> start mounted everything fine. zfs scrub reported no errors. Data was
> there, a few `less /mnt/../file` showing good data.
>
> Trying to recreate the pool config in the gui to avoid mounting by
> hand, I got some errors, but the GUI told me it detected a pool
> config, offered to synchronize but I was afraid not knowing in what
> direction it would do it. I removed the pool I created. Pool and
> dataset still accessible. I reboot, try a second time the "same"
> thing. But now the new pool is validated, the old pool isn't detected,
> and I got an empty dataset.
>
> I tried some commands (shouldn't have, idiocy). That said, I didn't
> add data to this new pool/dataset, and so I'm hoping the actual zfs
> object graph is intact. Of course I don't know how deep 'zpool ...'
> commands change things, that might be very naive of me.
>
> What options are there ? Could I copy the 3 1TB blocks onto another
> drive and attempt some form of uberblock scan ?
>
> Thanks in advance for your time.
>
> ps: what are other knowledgeable people ? freebsd-fs ML ? I have read
> George Wilson's name but it seems impolite.
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How about you drop to a shell and show:

# zpool status
and
# zpool import

?

/K