> BTW, when this is all over with, how do I make sure there are really
> two copies of everything? Will a scrub verify this? Should I run a
> balance operation?
pls use 'btrfs bal profile and convert' to migrate single chunk (if any
created when there were lesser number of RW-able devices) back to your
desired raid1. Do this when all the devices are back online. Kindly note
there is a bug in the btrfs VM that you won't be able to bring a device
online with out unmount -> mount (I am working to fix). btrfs-progs will
be wrong in this case don't depend too much on that.
So to understand inside of btrfs kernel volume I generally use:
https://patchwork.kernel.org/patch/5816011/
In there if bdev is null it indicates device is scanned but not part of
VM yet. Then unmount -> mount will bring device back to be part of VM.
>> After applying Anand's patch, I was able to mount my 4-drive RAID1
>> and bring a new fourth drive online.
>> However, something weird happened
>> where the first "delete missing" only deleted one missing drive and
>> only did a partial duplication. I've posted a bug report here:
that seems to be normal to me. unless I am missing something else / clarity.
Thanks, Anand
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