On 2017-10-17 13:58, Cloud Admin wrote:
Hi,
I want to remove two devices from a BTRFS RAID 1 pool. It should be
enough free space to do it, but what is the best strategie. Remove both
device in one call 'btrfs dev rem /dev/sda1 /dev/sdb1' (for example) or
should it be better in two separate calls? What is faster? Are there
other constraints to think about?
Ideally, delete them all with a single operation. Internally the delete
command uses some numeric trickery together with a balance operation to
migrate the data off of the devices being removed. If you do them one
at a time, you will end up moving at least some data twice, and thus
wasting time. Other than that, there's not much to worry ab out, though
keep in mind that deleting devices from an array can take a long time,
especially if the array is mostly full.
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