mdadm: bitmap size

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Hi all, i have this problem:

I am going to do raid 1 over two virtual devices. These virtual devices are two hard disks situated on other two servers.

The problem is:
A network failure could happen often, and if it happen, i don't want to recover all the disks. I want to recover just last changed things.

As i can see the bitmap do exactly this, but the default bitmap is too small! There is no problem to have a bitmap file of 1 Gb, but i can't find the way to tell to mdadm the size to use for the bitmap file.

Thanks,
Stefano.
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