From: "Tomas Dalebjörk" <tomas.dalebjork@gmail.com>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] exposing snapshot block device
Date: Mon, 7 Sep 2020 18:34:15 +0200 [thread overview]
Message-ID: <F484D1CA-73F2-49EE-9EE1-1902F322A591@gmail.com> (raw)
In-Reply-To: <a446fda9-d3c5-a184-8466-d63ae39f541c@redhat.com>
thanks for feedback
so if I understand this correctly
# fallocate -l 100M /tmp/pv1
# fallocate -l 100M /tmp/pv2
# fallocate -l 100M /tmp/pv3
# losetup —find —show /tmp/pv1
# losetup —find —show /tmp/pv2
# losetup —find —show /tmp/pv3
# vgcreate vg0 /dev/loop0
# lvcreate -n lv0 -l 1 vg0
# vgextend vg0 /dev/loop1
# lvcreate -s -l 1 -n lvsnap /dev/loop1
# vgchange -a n vg0
# lvconvert —splitsnapshot vg0/lvsnap
# vgreduce vg0 /dev/loop1
# vgcreate vg1 /dev/loop2
# lvcreate -n lv0 -l 1 vg1
# vgextend vg1 /dev/loop1
# lvconvert -s vg1/lvsnap vg1/lv0
not sure if the steps are correct?
regards Tomas
Sent from my iPhone
> On 7 Sep 2020, at 16:17, Zdenek Kabelac <zkabelac@redhat.com> wrote:
>
> Dne 07. 09. 20 v 16:14 Dalebjörk, Tomas napsal(a):
>> Hi Mikulas,
>> Thanks for the replies
>> I am confused now with the last message?
>> LVM doesn't support taking existing cow device and attaching it to an existing volume?
>> Isn't that what "lvconvert --splitsnapshot" & "lvconvert -s" is ment to be doing?
>> lets say that I create the snapshot on a different device using these steps:
>> root@src# lvcreate -s -L 10GB -n lvsnap vg/lv /dev/sdh
>> root@src# lvconvert ---splitsnapshot vg/lvsnap
>> root@src# echo "I now move /dev/sdb to another server"
>> root@tgt# lvconvert -s newvg/newlv vg/lvsnap
>
> Hi
>
> This is only supported as long as you stay within VG.
> So newlv & lvsnap must be in a single VG.
>
> Note - you can 'vgreduce' PV from VG1 and vgextend to VG2.
> But it always work on whole PV base - you can't mix
> LV between VGs.
>
> Zdenek
>
next prev parent reply other threads:[~2020-09-07 16:34 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-22 10:47 [linux-lvm] exposing snapshot block device Dalebjörk, Tomas
2019-10-22 13:57 ` Zdenek Kabelac
2019-10-22 15:29 ` Dalebjörk, Tomas
2019-10-22 15:36 ` Zdenek Kabelac
2019-10-22 16:13 ` Dalebjörk, Tomas
2019-10-23 10:26 ` Zdenek Kabelac
2019-10-23 10:56 ` Tomas Dalebjörk
2019-10-22 16:15 ` Stuart D. Gathman
2019-10-22 17:02 ` Tomas Dalebjörk
2019-10-22 21:38 ` Gionatan Danti
2019-10-22 22:53 ` Stuart D. Gathman
2019-10-23 6:58 ` Gionatan Danti
2019-10-23 10:06 ` Tomas Dalebjörk
2019-10-23 10:12 ` Zdenek Kabelac
2019-10-23 10:46 ` Zdenek Kabelac
2019-10-23 11:08 ` Gionatan Danti
2019-10-23 11:24 ` Tomas Dalebjörk
2019-10-23 11:26 ` Tomas Dalebjörk
2019-10-24 16:01 ` Zdenek Kabelac
2019-10-25 16:31 ` Tomas Dalebjörk
2019-11-04 5:54 ` Tomas Dalebjörk
2019-11-04 10:07 ` Zdenek Kabelac
2019-11-04 14:40 ` Tomas Dalebjörk
2019-11-04 15:04 ` Zdenek Kabelac
2019-11-04 17:28 ` Tomas Dalebjörk
2019-11-05 16:24 ` Zdenek Kabelac
2019-11-05 16:40 ` Mikulas Patocka
2019-11-05 20:56 ` Tomas Dalebjörk
2019-11-06 9:22 ` Zdenek Kabelac
2019-11-07 16:54 ` Mikulas Patocka
2019-11-07 17:29 ` Tomas Dalebjörk
2020-09-04 12:09 ` Tomas Dalebjörk
2020-09-04 12:37 ` Zdenek Kabelac
2020-09-07 13:09 ` Mikulas Patocka
2020-09-07 14:14 ` Dalebjörk, Tomas
2020-09-07 14:17 ` Zdenek Kabelac
2020-09-07 16:34 ` Tomas Dalebjörk [this message]
2020-09-07 16:42 ` Zdenek Kabelac
2020-09-07 17:37 ` Tomas Dalebjörk
2020-09-07 17:50 ` Zdenek Kabelac
2020-09-08 12:32 ` Dalebjörk, Tomas
2020-09-07 19:56 ` Tomas Dalebjörk
2020-09-07 20:22 ` Tomas Dalebjörk
2020-09-07 21:02 ` Tomas Dalebjörk
2019-10-23 12:12 ` Ilia Zykov
2019-10-23 12:20 ` Ilia Zykov
2019-10-23 13:05 ` Zdenek Kabelac
2019-10-23 14:40 ` Gionatan Danti
2019-10-23 15:46 ` Ilia Zykov
2019-10-23 12:59 ` Zdenek Kabelac
2019-10-23 14:37 ` Gionatan Danti
2019-10-23 15:37 ` Zdenek Kabelac
2019-10-23 17:16 ` Gionatan Danti
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