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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Tue, 3 May 2016 10:34:22 +0200
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Subject: Re: [linux-lvm] LVM feature parity with MD
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On 2.5.2016 13:03, Fabian Herschel wrote:
> Can LVM doing a delta sync and does LVM have something like a bitamp to show
> which parts are in sync and which needs a sync?
>

Hi

lvm uses small metadata LV with each raid1 leg - which holds the bitmap about 
individual regionsize areas in sync.

So when there is 'crash' only async areas are synced again after array restart.

Regards

Zdenek