On Mar 16, 2014, at 5:12 PM, Chris Murphy <li...@colorremedies.com> wrote:

> On Mar 16, 2014, at 4:55 PM, Chris Murphy <li...@colorremedies.com> wrote:
>> Then use btrfs replace start.
> Looks like in 3.14rc6 replace isn't yet supported. I get "dev_replace cannot 
> yet handle RAID5/RAID6".
> When I do:
> btrfs device add <new> <mp>
> The command hangs, no kernel messages.

So even though the device add command hangs, another shell with btrfs fi show 
reports that it succeeded:

Label: none  uuid: d50b6c0f-518a-455f-9740-e29779649250
        Total devices 4 FS bytes used 5.70GiB
        devid    1 size 7.81GiB used 4.02GiB path /dev/sdb
        devid    2 size 7.81GiB used 3.01GiB path /dev/sdc
        devid    3 size 7.81GiB used 4.01GiB path 
        devid    4 size 7.81GiB used 0.00 path /dev/sdd

Yet umount <mp> says the target is busy. ps reports the command status D+. And 
it doesn't cancel. So at the moment I'm stuck coming up with a work around.

Chris Murphy--
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