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Re: [linux-lvm] mirror and snapshot incompatible



It is possible to do all the things you are asking through device- mapper... but there is no easy way to do it. (and LVM does not yet have the capabilities to manage this yet either.)

 brassow

On Oct 27, 2008, at 9:28 PM, Yoav wrote:

According to lvcreate, a snapshot of a mirrored volume cannot be created ("Snapshots and mirrors may not yet be mixed"). However, devmapper does not seem to have the same limitation when used directly (not through lvm).

Is there a current reason for lvcreate to enforce this rather harsh limitation?

What are the risks I'm taking by manually creating a dm-snapshot from a dm-mirror device? (of course I'm also replacing the dm- mirror device with a snapshot-origin of the actual dm-mirror device).

If there is an actual reason for preventing this, what is the suggested way to consistently backup a mirror volume? Is there a way to temporarily take one of the mirror "legs" (mimage devices) offline in order to back it up, and resync it later?

  Yoav

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