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Date:      Fri, 13 May 2016 16:28:31 +0100
From:      Matthew Seaman <matthew@FreeBSD.org>
To:        freebsd-fs@freebsd.org
Subject:   Re: ZFS/Duplicated ZAP?
Message-ID:  <d66259e5-2349-210b-04a3-42b1564748e3@freebsd.org>
In-Reply-To: <21a44c938d0f09c22ec5fe2a6d7d5013@thebighonker.lerctr.org>
References:  <0df84959a28476a61654a9d4893f3f11@thebighonker.lerctr.org> <2f38a63e226d1f88f68af69725111b85@thebighonker.lerctr.org> <21a44c938d0f09c22ec5fe2a6d7d5013@thebighonker.lerctr.org>

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From: Matthew Seaman <matthew@freebsd.org>
To: freebsd-fs@freebsd.org
Message-ID: <d66259e5-2349-210b-04a3-42b1564748e3@freebsd.org>
Subject: Re: ZFS/Duplicated ZAP?
References: <0df84959a28476a61654a9d4893f3f11@thebighonker.lerctr.org>
 <2f38a63e226d1f88f68af69725111b85@thebighonker.lerctr.org>
 <21a44c938d0f09c22ec5fe2a6d7d5013@thebighonker.lerctr.org>
In-Reply-To: <21a44c938d0f09c22ec5fe2a6d7d5013@thebighonker.lerctr.org>

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On 05/13/16 16:19, Larry Rosenman wrote:
> Anyone?
>=20
> On 2016-05-11 15:31, Larry Rosenman wrote:
>> On 2016-05-11 15:23, Larry Rosenman wrote:
>>> What can I do to fix these?  A scrub does not.  From looking at
>>> comments where this is
>>> generated, seems like it maybe dedupe related.  Rebuilding the pool i=
s
>>> NOT an option at present.
>>>
>>> thebighonker.lerctr.org /home/ler $ grep -i zfs /var/log/messages
>>> May 11 00:03:31 thebighonker kernel: ZFS WARNING: Duplicated ZAP entr=
y
>>> detected (libssl.a).
>>> May 11 00:03:31 thebighonker kernel: ZFS WARNING: Duplicated ZAP entr=
y
>>> detected (libzpool.so).
>>> May 11 00:03:31 thebighonker kernel: ZFS WARNING: Duplicated ZAP entr=
y
>>> detected (libtinfo_p.a).
>>> May 11 00:03:31 thebighonker kernel: ZFS WARNING: Duplicated ZAP entr=
y
>>> detected (libumem.so).

You could try doing a zfs send ... | zfs recv ... to create a new copy
of the affected ZFSes.  This should pretty much unwind any effect of
having had deduplication turned on.

Then it's a matter of using 'zfs rename' to move the new copy into the
expected locations in your zfs hierarchy and have them mount at the
correct places in your filesystem.  That's something you'll almost
certainly need to do while booted from a live CD or similar.

	Cheers,

	Matthew



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