Date: Wed, 23 Aug 2017 15:27:00 -0400 From: Chris Ross <cross+freebsd@distal.com> To: Volodymyr Kostyrko <arcade@b1t.name> Cc: freebsd-fs@freebsd.org Subject: Re: zfs import from old TXG Message-ID: <EDD12C6C-21B8-4FFA-933D-4DF410ACAF25@distal.com> In-Reply-To: <bdece15b-d203-79df-2d10-4fb81154dd4f@b1t.name> References: <3408A832-BF2E-4525-9EAC-40979BA3555B@distal.com> <20170813000323.GC95431@server.rulingia.com> <5B508AED-4DAC-42E4-8C56-4619C0D1A1C6@distal.com> <035BFBCB-BA43-4568-89E9-8E8DCDFAA8CA@kraus-haus.org> <928F1F16-0777-4D66-BD27-8224DF80363C@distal.com> <06EEEF86-E466-44EA-86F1-866DA32DD92D@kraus-haus.org> <1d3771a3-9c3a-1af9-9c48-032a01629630@b1t.name> <FAE448FC-9A3F-43EE-8DED-963D51E6E158@distal.com> <bdece15b-d203-79df-2d10-4fb81154dd4f@b1t.name>
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> On Aug 23, 2017, at 14:31, Volodymyr Kostyrko <arcade@b1t.name> wrote:
>>> That's -T, it was intentionally left undocumented.
>>>
>>> /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c /starting txg
>>
>> Looking back at this, and trying to recover some data without multi-day clean/restore cycles. I want to import my pool to an earlier txg. I used zfs history to log the actions, and am trying to use “zpool import -N [-F] -T 7428 tank”. With or without a -F argument, I get:
>>
>> cannot import 'tank': one or more devices is currently unavailable
>>
>> However, zpool import shows all of its devices ONLINE, and I only exported it a short while ago. Is there something I’m missing that I can provide to proceed with effectively importing an earlier state of this pool?
>
> Available transactions can be listed with:
>
> zdb -ul <device>
>
> I can't remember how long it takes to overwrite old transactions but if the pool was imported more then a few hours after the disk was added older transactions would already be overwritten...
>
> PS: If not minutes.
It was imported, though not mounted, for a few minutes during which time I broke something I’m trying to recover, and a few minutes after until I exported it and started evaluating whether it was recoverable.
Using zdb -ul, I see no tag’s around where I was aiming (7428), but I do see three in the 7300’s. But, trying “zpool import -N -T 7375 tank” produces the same error. As with the other two txg’s (7378, 7381) I saw.
Any other ideas, since it looks like “available transaction” isn’t my [only] problem?
- Chris
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