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From: "Davis, Matthew" <Matthew.Davis.2@team.telstra.com>
To: "linux-lvm@redhat.com" <linux-lvm@redhat.com>
Subject: [linux-lvm] how to copy a snapshot, or restore snapshot without deleting it
Date: Thu, 3 Jan 2019 04:46:44 +0000	[thread overview]
Message-ID: <MEAPR01MB502904BB1C62BCAEDA77544FC28D0@MEAPR01MB5029.ausprd01.prod.outlook.com> (raw)

Hi,

I want to restore a snapshot without deleting the snapshot.

My use case is that I'm experimenting with a lot of different drivers, kernel modules, and file modifications all over my machine.
I want to 
1. take a snapshot of the working system
2. make changes
3. restore the snapshot (` sudo lvconvert --merge /dev/ubuntu-vg/$SNAPSHOT` then reboot)
4. make new changes
5. restore to the snapshot again

The problem is that step 3 deletes the snapshot, so step 5 fails.

My current workaround is:
1. take a snapshot of the working system
2. make changes
3. restore the snapshot (` sudo lvconvert --merge /dev/ubuntu-vg/$SNAPSHOT` then reboot)
4. Wait 1.5 hours, without making any changes to the machine
5. Take a new snapshot, with the same name as the original
6. make new changes
7. restore to the snapshot

This is not great because:
* I sometimes forget to do step 5
* I can't take a snapshot of the volume while it is still merging. This takes 1.5 hours. I want to be able to restore my snapshots multiple times per day


Is there a flag I can add to `lvconvert` to make it not delete the snapshot?
Alternatively, is there a way I can make a copy of the snapshot before I restore it?

It looks like someone else asked this question 10 years ago. 
https://www.redhat.com/archives/linux-lvm/2008-November/msg00000.html
Has this problem been solved since then?

Thanks,
Matt Davis

Technical Specialist
Telstra | Product Strategy & Innovation - Telstra Labs | Programmable Infrastructure
E �Matthew.Davis.2@team.telstra.com 

             reply	other threads:[~2019-01-03  4:46 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-03  4:46 Davis, Matthew [this message]
2019-01-03  9:32 ` [linux-lvm] how to copy a snapshot, or restore snapshot without deleting it Tomas Dalebjörk
2019-01-03 14:09 ` Marian Csontos
2019-01-10  6:23   ` Davis, Matthew
2019-01-10  9:45     ` Zdenek Kabelac
2019-01-14 22:44       ` Davis, Matthew
2019-01-15 10:49         ` Zdenek Kabelac
2019-01-15 23:03           ` Davis, Matthew
2019-01-16 13:55             ` Zdenek Kabelac
2019-01-17  1:12               ` Davis, Matthew
2019-01-17  9:21                 ` Zdenek Kabelac
2019-01-18  0:53                   ` Davis, Matthew
2019-01-18  9:34                     ` Zdenek Kabelac
2019-01-21 10:32                     ` Zdenek Kabelac
2019-01-28 11:49                       ` Zdenek Kabelac
2019-01-30 23:58                         ` Davis, Matthew
2019-01-10 14:34     ` Tomas Dalebjörk
2019-01-11 19:29       ` Sarah Newman

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