From owner-freebsd-stable@freebsd.org  Thu Apr 26 14:37:24 2018
Return-Path: <owner-freebsd-stable@freebsd.org>
Delivered-To: freebsd-stable@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 873DBFAEE2C;
 Thu, 26 Apr 2018 14:37:24 +0000 (UTC)
 (envelope-from eugen@grosbein.net)
Received: from hz.grosbein.net (unknown [IPv6:2a01:4f8:d12:604::2])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 05D5F72D64;
 Thu, 26 Apr 2018 14:37:23 +0000 (UTC)
 (envelope-from eugen@grosbein.net)
Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be
 forged))
 by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id w3QEbH4Y035767
 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Thu, 26 Apr 2018 16:37:17 +0200 (CEST)
 (envelope-from eugen@grosbein.net)
X-Envelope-From: eugen@grosbein.net
X-Envelope-To: avg@FreeBSD.org
Received: from [10.58.0.4] ([10.58.0.4])
 by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id w3QEbCvn027163
 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT);
 Thu, 26 Apr 2018 21:37:12 +0700 (+07)
 (envelope-from eugen@grosbein.net)
Subject: Re: clear old pools remains from active vdevs
To: Andriy Gapon <avg@FreeBSD.org>, "Eugene M. Zheganin" <eugene@zhegan.in>,
 freebsd-stable@freebsd.org
References: <b9e405dc-d3b3-af81-64b3-9e310988fa7c@zhegan.in>
 <92b45b63-48c0-e9fe-c7c8-3ff24f37bf1f@FreeBSD.org>
Cc: freebsd-fs@freebsd.org
From: Eugene Grosbein <eugen@grosbein.net>
Message-ID: <5AE1E414.4010408@grosbein.net>
Date: Thu, 26 Apr 2018 21:37:08 +0700
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.7.2
MIME-Version: 1.0
In-Reply-To: <92b45b63-48c0-e9fe-c7c8-3ff24f37bf1f@FreeBSD.org>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE,
 SPF_PASS autolearn=no autolearn_force=no version=3.4.1
X-Spam-Report: * -0.0 SPF_PASS SPF: sender matches SPF record
 * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1%
 *      [score: 0.0000] *  2.6 LOCAL_FROM From my domains
 *  1.9 RDNS_NONE Delivered to internal network by a host with no rDNS
X-Spam-Level: **
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.25
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-stable>, 
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 26 Apr 2018 14:37:24 -0000

26.04.2018 14:50, Andriy Gapon wrote:

> You can try to use zdb -l to find the stale labels.
> And then zpool labelclear to clear them.

Our "zpool labelclear" implementation destroys everything (literally).
Have you really tried it?