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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