On 2017-09-10 02:33, Marat Khalili wrote:
It doesn't need replaced disk to be readable, right? Then what prevents same
procedure to work without a spare bay?
In theory, nothing.
In practice, there are reliability issues with mounting a filesystem
degraded (and you should be avoiding running any array degraded,
regardless of if it's BTRFS or actual RAID (be that LVM, MD, or
hardware)). It's also significantly faster to do it with a spare drive
bay because that will just read from the device being replaced and copy
data directly, while pulling the device to be replaced requires
rebuilding the data (there is more involved than just copying, even with
a raid1 profile).
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