Date: Tue, 16 Jan 2018 14:57:38 +0100 From: Mateusz Kwiatkowski <kwiat@panic.pl> To: freebsd-fs@freebsd.org Subject: Re: Academic exercise: trying to recover a corrupted pool Message-ID: <19f67e4f-7df8-6184-e396-aa8cde44eb83@panic.pl> In-Reply-To: <F6B823C4-313E-4AF2-B1F6-6AFE8E17458B@sarenet.es> References: <F6B823C4-313E-4AF2-B1F6-6AFE8E17458B@sarenet.es>
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On 01/08/2018 03:25 PM, Borja Marcos wrote: > > Hi, > > ONLY AS AN ACADEMIC EXERCISE, WARNING :) > > I have a broken ZFS pool and I’m wondering wether it should be readable. The pool was made with four > apparently troublesome OCZ SSD drives pulled from other systems. They are connected to a LSI2008 adapter. > > The pool was created as a raidz2, so it’s supposed to survive the loss of two drives. It has lost two of them > and I am unable to import it. > > I have lost no useful data, I was using it just for testing. Now it has become an interesting study subject though :) > > Any ideas? I have tried to recover even doing the “radical thing” (zdb -Z -AAA -e -p /dev poolname). No success. > > Again, I am just curious. > > > Thanks! Few years ago I made similar exercise with pool broken by some ZFS on Linux bug. After many unsuccessful attempts to import the pool I came up with an idea to read data without importing the pool. Here's the script: https://gitlab.com/kwiat/zfs-recovery The code is in no way effective nor beautiful, but I learned a lot about ZFS when I was working on it. :-) -- Regards, Mateusz Kwiatkowski
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