From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D9FB7C433F5 for ; Mon, 20 Dec 2021 06:57:22 +0000 (UTC) Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-58-P3roh7PtPcOIBTxxK5Am5A-1; Mon, 20 Dec 2021 01:57:19 -0500 X-MC-Unique: P3roh7PtPcOIBTxxK5Am5A-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 97B241023F51; Mon, 20 Dec 2021 06:57:14 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D378A84A0F; Mon, 20 Dec 2021 06:57:11 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 8C8B51809CB9; Mon, 20 Dec 2021 06:56:57 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 1BJGi3Kx007552 for ; Sun, 19 Dec 2021 11:44:03 -0500 Received: by smtp.corp.redhat.com (Postfix) id BC9F4C15E74; Sun, 19 Dec 2021 16:44:03 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast02.extmail.prod.ext.rdu2.redhat.com [10.11.55.18]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B810CC15E73 for ; Sun, 19 Dec 2021 16:44:03 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-1.mimecast.com [205.139.110.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9EBE1800B21 for ; Sun, 19 Dec 2021 16:44:03 +0000 (UTC) Received: from mail-yb1-f173.google.com (mail-yb1-f173.google.com [209.85.219.173]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-442-pUxsUjELOQy3z5ntiMTRxg-1; Sun, 19 Dec 2021 11:44:01 -0500 X-MC-Unique: pUxsUjELOQy3z5ntiMTRxg-1 Received: by mail-yb1-f173.google.com with SMTP id v138so21755422ybb.8 for ; Sun, 19 Dec 2021 08:44:01 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=PDCKgvmj7yqC7KJk9TfedF8xhxfmeGkVoNfQ0XKR6oE=; b=tm/mbq88uzJxTG9zB/YvL9zgzH17v+/UTkf7L6EzELYHC6eUVTo3f4XNWLfQjL2s6V pt649LztQ0/ly6+PA0CYfrlT7CaDkb2p4fagtAgrXulSuVZ7BcmfyCN/L5HTKCZ4JBBM dTEXPw59xNv4TUmZnYuNe+mi9DLyJMXnwTRylarDiOfwmuvq4VHMuBrQ5ou/GO9d+8tl 5Hf0nHnmwJrLLQu1LWOWJgH+z2hO3BRwhtwQYA0+HH2mN4KbvwO7ppVqN48geBZVDB4k Bc5T99Rb5hECx9Ly6PY45GTz4AAiD9Mar/8iDFPZPaydV8vy+4oJrr0tHN0n+NECaGvR JM3A== X-Gm-Message-State: AOAM5332GY8HgbiNCsVfo0fxxOeuy8R920/Gte6MwdZ7IlsPHuWVBR+w HX6gR2wVYMBUq63IXc5AjiSxQZF2LJ94dk/2OSbA1lxVotU= X-Google-Smtp-Source: ABdhPJyo8LquF8CEi9R16EhPXzCSyEFo+XzkMO3ZLrIr4uXFdW1w9vN6ysf+ML0x0yG2+UTmWyyYIRRkHZdsOLGnKJE= X-Received: by 2002:a25:748d:: with SMTP id p135mr17543309ybc.169.1639932240814; Sun, 19 Dec 2021 08:44:00 -0800 (PST) MIME-Version: 1.0 From: =?UTF-8?Q?Tomas_Dalebj=C3=B6rk?= Date: Sun, 19 Dec 2021 17:43:48 +0100 Message-ID: To: LVM general discussion and development X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 X-loop: linux-lvm@redhat.com X-Mailman-Approved-At: Mon, 20 Dec 2021 01:56:54 -0500 Subject: [linux-lvm] how to convert a disk containing a snapshot to a snapshot lv? X-BeenThere: linux-lvm@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-lvm-bounces@redhat.com Errors-To: linux-lvm-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-lvm-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="===============0555752368390693658==" --===============0555752368390693658== Content-Type: multipart/alternative; boundary="000000000000ab644705d3827a5e" --000000000000ab644705d3827a5e Content-Type: text/plain; charset="UTF-8" Hi, I am trying to understand how to convert a disk containing snapshot data. This is how I tested this: 1. locate the snapshot testlv.211218.232255 root@debian10:/dev/mapper# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home debian10-vg -wi-ao---- 1.00g root debian10-vg -wi-ao---- <3.81g swap_1 debian10-vg -wi-ao---- 976.00m testlv debian10-vg owi-aos--- 100.00m testlv.211218.232255 debian10-vg swi-a-s--- 104.00m testlv 1.44 root@debian10:/dev/mapper# 2. copy the lv - cow data to a file # dd if=/dev/mapper/debian10--vg-testlv.211218.232255-cow of=/tmp/out bs=1024 3. Setup a loopback disk for the file # losetup -fP /tmp/out 4. Verify that disk exists root@debian10:/dev/mapper# losetup -a /dev/loop0: [65025]:39274 (/tmp/out) root@debian10:/dev/mapper# 5. Try converting the disk using lvconvert command # lvconvert -Zn -s debian10-vg/testlv /tmp/out "/tmp/out": Invalid path for Logical Volume. 6. Trying creating a softlink in /dev/mapper # ln -s /tmp/out debian10--vg-loopback 7. verify link root@debian10:/dev/mapper# ls -la total 0 drwxr-xr-x 2 root root 240 Dec 19 17:40 . drwxr-xr-x 18 root root 3820 Dec 19 17:22 .. crw------- 1 root root 10, 236 Dec 10 19:10 control lrwxrwxrwx 1 root root 7 Dec 10 19:10 debian10--vg-home -> ../dm-5 lrwxrwxrwx 1 root root 8 Dec 19 17:40 debian10--vg-loopback -> /tmp/out lrwxrwxrwx 1 root root 7 Dec 13 22:20 debian10--vg-root -> ../dm-1 lrwxrwxrwx 1 root root 7 Dec 10 19:10 debian10--vg-swap_1 -> ../dm-4 lrwxrwxrwx 1 root root 7 Dec 18 23:23 debian10--vg-testlv -> ../dm-0 lrwxrwxrwx 1 root root 7 Dec 18 23:23 debian10--vg-testlv.211218.232255 -> ../dm-6 lrwxrwxrwx 1 root root 7 Dec 18 23:23 debian10--vg-testlv.211218.232255-cow -> ../dm-3 lrwxrwxrwx 1 root root 7 Dec 18 23:23 debian10--vg-testlv-real -> ../dm-2 root@debian10:/dev/mapper# 8. retrying lvconvert command root@debian10:/dev/mapper# lvconvert -Zn -s debian10-vg/testlv /dev/mapper/debian10--vg-loopback Failed to find logical volume "debian10-vg/loopback" root@debian10:/dev/mapper# Are there more things to be considered, such as recreating pv data on disk? Regards Tomas --000000000000ab644705d3827a5e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

I am trying to understan= d how to convert a disk containing snapshot data.
This is how I t= ested this:
1. locate the snapshot testlv.211218.232255
=
root@debian10:/dev/mapper# lvs=C2=A0 LV =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = VG =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Attr =C2=A0 =C2=A0 =C2=A0 LSize =C2=A0= Pool Origin Data% =C2=A0Meta% =C2=A0Move Log Cpy%Sync Convert
=C2=A0 ho= me =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 debian10-vg -wi-= ao---- =C2=A0 1.00g
=C2=A0 root =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 debian10-vg -wi-ao---- =C2=A0<3.81g
=C2=A0 swap_1 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 debian10-vg -wi-ao---- 976= .00m
=C2=A0 testlv =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 debi= an10-vg owi-aos--- 100.00m
=C2=A0 testlv.211218.232255 debian10-vg swi-a-s--- 104.00m =C2=A0 =C2=A0= =C2=A0testlv 1.44
root@debian10:/dev/mapper#
2. copy the lv - cow data to a file
# dd = if=3D/dev/mapper/debian10--vg-testlv.211218.232255-cow of=3D/tmp/out bs=3D1= 024

3. Setup a loopback disk for the= file
# losetup -= fP /tmp/out

4. Verify that disk exists
root@debian10:/dev/mapper# losetup -a
/dev/loop0: [65025]:39274 (/tmp/out)<= /span>
root@debian10:/dev/mapper#

5. Try= converting the disk using lvconvert command
# lvconvert -Zn -s debian10-vg/testlv /tmp/out
=C2=A0 "/tmp/out": Invalid path for Logical Volum= e.

6. Trying creating a softlink in = /dev/mapper
# ln -s /tmp/out debian10--vg-loopback

7. verify link
root@debian10:/dev/mapper# ls -la
total 0
drw= xr-xr-x =C2=A02 root root =C2=A0 =C2=A0 240 Dec 19 17:40 .
drwxr-xr-x 18= root root =C2=A0 =C2=A03820 Dec 19 17:22 ..
crw------- =C2=A01 root roo= t 10, 236 Dec 10 19:10 control
lrwxrwxrwx =C2=A01 root root =C2=A0 =C2= =A0 =C2=A0 7 Dec 10 19:10 debian10--vg-home -> ../dm-5
lrwxrwxrwx =C2=A01 root root =C2=A0 =C2= =A0 =C2=A0 8 Dec 19 17:40 debian10--vg-loopback -> /tmp/out
lr= wxrwxrwx =C2=A01 root root =C2=A0 =C2=A0 =C2=A0 7 Dec 13 22:20 debian10--vg= -root -> ../dm-1
lrwxrwxrwx =C2=A01 root root =C2=A0 =C2=A0 =C2=A0 7 = Dec 10 19:10 debian10--vg-swap_1 -> ../dm-4
lrwxrwxrwx =C2=A01 root r= oot =C2=A0 =C2=A0 =C2=A0 7 Dec 18 23:23 debian10--vg-testlv -> ../dm-0lrwxrwxrwx =C2=A01 root root =C2=A0 =C2=A0 =C2=A0 7 Dec 18 23:23 debian10= --vg-testlv.211218.232255 -> ../dm-6
lrwxrwxrwx =C2=A01 root root =C2= =A0 =C2=A0 =C2=A0 7 Dec 18 23:23 debian10--vg-testlv.211218.232255-cow ->= ; ../dm-3
lrwxrwxrwx =C2=A01 root root =C2=A0 =C2=A0 =C2=A0 7 Dec 18 23:= 23 debian10--vg-testlv-real -> ../dm-2
root@debian10:/dev/mapper#

8. retrying lvconvert command
root@debian10:/dev/mapper# lvconvert -Zn -s debian10-vg/testlv /dev/ma= pper/debian10--vg-loopback
=C2=A0 Failed to find logical volume "debian10-vg/loopback&quo= t;
root@debian10:/dev/mapper#

Are= there more things to be considered, such as recreating pv data on disk?

Regards Tomas

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