Hello,
I set up a raid 1 with two btrfs devices and came across some situations in my testing that I can't get a straight answer on.
1) When replacing a volume, do I still need to `umount /path` and then `mount -o degraded ...` the good volume before doing the `btrfs replace start ...` ? I didn't see anything that said I had to and when I tested it without mounting the volume it was able to replace the device without any issue. Is that considered bad and could risk damage or has `replace` made it possible to replace devices without umounting the filesystem?
2) Everything I see about replacing a drive says to use `/old/device /new/device` but what if the old device can't be read or no longer exists? Would that be a `btrfs device add /new/device; btrfs balance start /new/device` ?
3) When I have the RAID1 with two devices and I want to grow it out, which is the better practice? Create a larger volume, replace the old device with the new device and then do it a second time for the other device, or attaching the new volumes to the label/uuid one at a time and with each one use `btrfs filesystem resize devid:max /mountpoint`.
Thanks
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