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Re: kern/57081: ZFS pool rolled back two years, all data lost since.
The following reply was made to PR kern/57081; it has been noted by GNATS.
From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: Roy Marples <roy%marples.name@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/57081: ZFS pool rolled back two years, all data lost since.
Date: Fri, 11 Nov 2022 10:29:28 +0000
> Date: Fri, 11 Nov 2022 10:23:19 +0000
> From: Roy Marples <roy%marples.name@localhost>
>
> On 11/11/2022 10:00, Taylor R Campbell wrote:
> > 1. Can you make an archive of the vdevs, and any zpool.cache file,
> > onto another medium just so that you don't lose anything more in
> > the event of experimentation?
>
> Unsure how?
> I will prep a spare disk to boot from in the meantime.
Just dd from the raw disk onto a spare disk -- in this case, it looks
like your zpool is just on dk5, so copy the content of dk5 to
somewhere else.
> > 4. Can you share output from `zdb -e -l <vdev>' and from `zdb -e -h
> > <pool>'?
>
> # zdb -e -l /dev/dk0
> cannot open '/dev/dk0': Device busy
> # zdb -e -h rpool
> zdb: can't open 'rpool': No such file or directory
> # zdb rpool
> zdb: can't open 'rpool': Device busy
Can you do these from single-user mode, without the zpool imported?
<vdev> here should be `/dev/rdk5', judging by your description.
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