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.
>>>=20
>>> /usr/src/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c /starting =
txg
>>=20
>> 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 =
=E2=80=9Czpool import -N [-F] -T 7428 tank=E2=80=9D. With or without a =
-F argument, I get:
>>=20
>> cannot import 'tank': one or more devices is currently unavailable
>>=20
>> However, zpool import shows all of its devices ONLINE, and I only =
exported it a short while ago. Is there something I=E2=80=99m missing =
that I can provide to proceed with effectively importing an earlier =
state of this pool?
>=20
> Available transactions can be listed with:
>=20
> zdb -ul <device>
>=20
> 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...
>=20
> PS: If not minutes.
It was imported, though not mounted, for a few minutes during which =
time I broke something I=E2=80=99m 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=E2=80=99s around where I was aiming =
(7428), but I do see three in the 7300=E2=80=99s. But, trying =E2=80=9Czp=
ool import -N -T 7375 tank=E2=80=9D produces the same error. As with =
the other two txg=E2=80=99s (7378, 7381) I saw.
Any other ideas, since it looks like =E2=80=9Cavailable transaction=E2=80=
=9D isn=E2=80=99t my [only] problem?
- Chris
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