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Subject: Re: size 2.73TiB used 240.97GiB after balance
To: Donald Pearson <donaldwhpearson@gmail.com>,
        Hugo Mills <hugo@carfax.org.uk>,
        Hendrik Friedel <hendrik@friedels.name>,
        Btrfs BTRFS <linux-btrfs@vger.kernel.org>
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From: Omar Sandoval <osandov@fb.com>
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Date: Mon, 6 Jul 2015 13:52:59 -0700
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On 07/06/2015 01:01 PM, Donald Pearson wrote:
> Based on my experience Hugo's advice is critical, get the bad drive
> out of the pool when in raid56 and do not try to replace or delete it
> while it's still attached and recognized.
> 
> If you add a new device, mount degraded and rebalance.  If you don't,
> mount degraded then device delete missing.
> 

Watch out, replacing a missing device in RAID 5/6 currently doesn't work
and will cause a kernel BUG(). See my patch series here:
http://www.spinics.net/lists/linux-btrfs/msg44874.html

-- 
Omar