there is a filesystem or partition table on the device already.
-n|--nodesize <size>
-+
+
-l|--leafsize <size>::
Specify the nodesize, the tree block size in which btrfs stores
data. The default value is 16KB (16384) or the page size, whichever is
-bigger. Must be a multiple of the sectorsize, but not larger than
-65536. Leafsize always equals nodesize and the options are aliases.
+bigger. Must be a multiple of the sectorsize, but not larger than 65536.
+Leafsize always equals nodesize and the options are aliases.
-L|--label <name>::
Specify a label for the filesystem.
+
NOTE: <name> should be less than 256 characters.
-
-m|--metadata <profile>::
Specify how metadata must be spanned across the devices specified. Valid
values are 'raid0', 'raid1', 'raid5', 'raid6', 'raid10', 'single' or 'dup'.