On Tue, Mar 29, 2011 at 4:21 PM, cwillu <cwi...@cwillu.com> wrote:
> On Tue, Mar 29, 2011 at 2:09 PM, Andrew Lutomirski <l...@mit.edu> wrote:
>> I have a disk with a SMART failure. It still works but I assume it'll
>> fail sooner or later.
>>
>> I want to remove it from my btrfs volume, replace it, and add the new
>> one. But the obvious command doesn't work:
>>
>> # btrfs device delete /dev/dm-5 /mnt/foo
>> ERROR: error removing the device '/dev/dm-5'
>>
>> dmesg says:
>> btrfs: unable to go below two devices on raid1
>>
>> With mdadm, I would fail the device, remove it, run degraded until I
>> get a new device, and hot-add that device.
>>
>> With btrfs, I'd like some confirmation from the fs that data is
>> balanced appropriately so I won't get data loss if I just yank the
>> drive. And I don't even know how to tell btrfs to release the drive
>> so I can safely remove it.
>>
>> (Mounting with -o degraded doesn't help. I could umount, remove the
>> disk, then remount, but that feels like a hack.)
>
> There's no "nice" way to remove a failing disk in btrfs right now
> ("btrfs dev delete" is more of a online management thing to politely
> remove a perfectly functional disk you'd like to use for something
> else.) As I understand things, the only way to do it right now is the
> umount, remove disk, remount w/ degraded, and then btrfs add the new
> device.
>
Well, the disk *is* perfectly functional. It just won't be for long.
I guess what I'm saying is that either btrfs dev delete isn't really
working -- I want to be able to convert to non-RAID and back or
degraged and back or something else equivalent.
--Andy
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