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Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?
From: |
edgar . soldin |
Subject: |
Re: [Duplicity-talk] Direct backup of LVM snapshot partitions? |
Date: |
Sat, 08 Dec 2012 12:48:45 +0100 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20121026 Thunderbird/16.0.2 |
On 07.12.2012 19:01, George MacKerron wrote:
> Hi all.
>
> I'm trying to use duplicity to back up LVM snapshots (which are Xen domU
> disks).
>
> I've seen scripts that take a snapshot, mount the snapshot, and then back up
> the files inside it. But my preference is to just back up the LVM logical
> volume directly. I feel more comfortable knowing I have an exact,
> filesystem-level snapshot.
that's what a snapshot is.where do you figure a difference between the snapshot
and the parent logical device, except of the static nature of the snapshot
though?
> However, this doesn't appear to work: if I specify a volume such as
> /dev/dm-10, this isn't backed up. So at the moment I am using dd to copy the
> volume data to a temporary file, and then using Duplicity on this. However,
> this causes a lot of seemingly unnecessary disk thrashing.
first.. to backup a device node makes no sense. these are just special files
with no actual content except of some metadata meaningful to (kernel)software
only.
http://en.wikipedia.org/wiki/Device_file
secondly, what you want is the snapshot. it allows you access without copying
first.
finally: you can of course always access your data where you mounted it in the
first place, hence in the vms you are running and run your backup in there.
so understand, device nodes have to be mounted (or dumped;) in order to access
their data.
..ede/duply.net
- [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/07
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, George MacKerron, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, GDR!, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/10
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, GDR!, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, edgar . soldin, 2012/12/11
- Re: [Duplicity-talk] Direct backup of LVM snapshot partitions?, T. Prost, 2012/12/11