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From: Gabriel de Perthuis <g2p.code-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: software raid and bcache
Date: Wed, 3 Jul 2013 18:03:27 +0000 (UTC)
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On Wed, 03 Jul 2013 21:57:54 +0400, Vasiliy Tolstov wrote:
> 2013/7/3 Jason Warr <jason-/cow75dQlsI@public.gmane.org>:
>> In a mirror your raid device can only be as big as the smallest device.
>> So if you put in a secondary device that is larger than the first you
>> still cannot go beyond the size of the first unless you then replace it
>> after syncing the second.
> 
> Yes i'm understand this. But normally i want to work with one device
> in raid1 =). Thanks all for help!

LVM would give you more flexibility for the use case of
moving data around, you could use any number of disks
regardless of their sizes.  Though I suppose you're
sticking with what you know.