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Date: Fri, 21 Oct 2016 22:07:26 +0000
From: Hugo Mills <hugo@carfax.org.uk>
To: Gareth Pye <gareth@cerberos.id.au>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Drive Replacement
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On Sat, Oct 22, 2016 at 09:03:16AM +1100, Gareth Pye wrote:
> I've got a BTRFS array that is of mixed size disks:
> 2x750G
> 3x1.5T
> 3x3T
> And it's getting fuller than I'd like. The problem is that adding
> disks is harder than one would like as the computer only has 8 sata
> ports. Is it viable to do the following to upgrade one of the disks?
> 
> A) Take array offline
> B) DD the contents of one of the 750G drives to a new 3T drive
> C) Remove the 750G from the system
> D) btrfs scan
> E) Mount array
> F) Run a balance
> 
> I know that not physically removing the old copy of the drive will
> cause massive issues, but if I do that everything should be fine
> right?

   Yes. The one thing missing here is running 

# btrfs dev resize <devid>:max /mountpoint

on the new device between steps E and F to allow the FS to use the
full amount of the device. Otherwise, it'll still be the same size as
the original.

   Hugo.

-- 
Hugo Mills             | Great films about cricket: Batsman Begins
hugo@... carfax.org.uk | starring Christian Bail
http://carfax.org.uk/  |
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