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Re: [dm-devel] dm-cache: dirty state of blocks in writethrough mode

On 07/26/2013 04:45 AM, Kumar amit mehta wrote:
On Thu, Jul 25, 2013 at 12:45:31PM +0200, Heinz Mauelshagen wrote:
You can set up a mirrored metadata device to be resilient against
SSD failures.

Plus you can take metadata snapshots at arbitrary points in time;
see the targets kernel documentation in thin-provisioning.txt for this
and the recent thin_dump support metadata snapshots  in the rawhide
device-mapper-persistent-data package.

So these feature is already upstream and also in fedora 20, but not in
Red Hat 6.4 yet ?

No, it's planned for RHEL7.

Either is subject to future LVM2 support and isn't supported as yet.
So, if LVM2 doesn't support it as of now, Any idea if EVMS or any other
volume Managers consume these features?

None that I'm aware of.

Use dmsetup for early testing.

We'll support it in LVM2 later in the year.



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