Hi James,
I find this for btrfs
device delete <dev> [<dev>..] <path>
Remove device(s) from a filesystem identified by <path>.
device add <dev> [<dev>..] <path>
Add device(s) to the filesystem identified by <path>.
https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices#Replacing_failed_devices
gives more details, including the "delete missing" option, I cannot find at
my CentOS 6 box manpage I just quoted.
I hope it helps. I looked it up out of curiosity, I am used to ZFS, to
"zpool offline" and "zpool replace".
Regards
Peter
On Mon, Feb 1, 2016 at 10:52 PM, James Harper via luv-main <
[email protected]> wrote:
> Is there a way that I can, on a running system, mark a btrfs disk as
> having failed, so that it will now be “missing” and the array will be in a
> degraded state?
>
>
>
> I can obviously do it by using fdisk to delete the partition, then
> rebooting and mounting with the degraded option, but I want to do it
> without a reboot, and without having to tinker with the boot process
> remotely.
>
>
>
> I can also delete the device (move all the data off the device), then
> delete it, then add the new device, then rebalance to move all the data
> back, and that would be safer, but would be terribly slow. Also I’m not
> sure I have enough free space to allow this (maybe I do, but it would be
> tight enough that I can’t be sure there wouldn’t be some overhead I haven’t
> taken into account)
>
>
>
> Thanks
>
>
>
> James
>
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