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Re: [dm-devel] "create snapshots of any block device"



On 01/22/2013 11:12 AM, Hauke Laging wrote:
Isn't that at least misleading? Is it really possible to create a snapshot of
e.g. /dev/sda5 without creating an *additional* device as snapshot origin?

It's possible but as you note you have to create the dm layers for the snapshot. This means that if a non-dm device is in use you have to shut its users down (unmount file systems etc.), create the snapshot and then re-mount.

I've frequently used this in the past to snapshot large zero targets to create sparse devices for testing (before --virtualsize was added to LVM2).

With device-mapper devices this is unnecessary since the top-level device may be suspended while the snapshot layers are inserted.

Regards,
Bryn.


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