[zfs-discuss] cannot import 'home': I/O error Destroy and re-create the pool from a backup source

Daniel Armengod daniel at armengod.cat
Sun Apr 22 16:23:11 EDT 2018

Hi Gregor,

Why is zfs send a potentially dangerous operation? If the pool was
imported with -o readonly, and you can send the filesystem without
snapshotting it first, does it introduce extra risk vs dd-ing the whole
drive away? I'm assuming the stream is sent to a machine over the network.


On 2018-04-21 22:57, Gregor Kopka (@zfs-discuss) via zfs-discuss wrote:
> Am 21.04.2018 um 19:36 schrieb Anton Gubar'kov via zfs-discuss:
>> I have no further backups
>> I would like to recover this pool as it contains some valuable data I
>> cannot reproduce ever (video archive).
> 1) Power down the system
> 2) obtain 6 new drives of same or bigger size
> 3) dd/dd_rescue the old to the new drives
> 4) disconnect the original drives
> 5) do any recovery attempts on the copies
> After reviving the pool (getting back access to your data) you can
> either revive the other set of drives with the method that was
> successful on the copies or create a fresh pool out of them, preferable
> on another machine, to have a second backup.
> As a note for after the problem has been solved: Never use zfs send
> -R/-p or zfs recv -F when dealing with backups (as these are able to
> destroy more than you want).
> Gregor
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