Hi Russell,

there was enough space (in theory) to keep all data on one disk (less than 5GB on a 8GB partition, from memory), and the "btrfs delete" seems to have succeeded. "btrfs filesystem df /" and device stats looked fine and did not show any reference to the second disk.

The trouble only started when I removed the second disk (physically, as in disk on a virtual machine on ESXi).

Using a newer kernel is out of question here - I have to use the latest "Enterprise Linux" (CentOS 7) without patches.

It looks as I have to abandon all plans to use btrfs and am back in the stone age.

Thanks for comments and suggestions

Peter

On Tue, Jul 28, 2015 at 11:21 PM, Russell Coker <russell@coker.com.au> wrote:

On Tue, 28 Jul 2015 01:53:10 PM Peter Ross wrote:
> In the meantime, I experimented with btrfs add/delete.
>
> btrfs delete was the end of it. The system was stuck and after reset it did
> not boot anymore.

You need to make sure there's enough space free before doing that.

If you want your data back then try mounting with a newer kernel. In future
don't use small filesystems with BTRFS, it's not designed to have lots of small
partitions the way that Ext* is.

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