#. A small partition is formatted with XFS and contains basic metadata
for the OSD. This *data directory* includes information about the
OSD (its identifier, which cluster it belongs to, and its private
- keyring.
+ keyring).
#. The rest of the device is normally a large partition occupying the
rest of the device that is managed directly by BlueStore contains
It is possible to use a smaller checksum value by truncating the
checksum to two or one byte, reducing the metadata overhead. The
trade-off is that the probability that a random error will not be
-detected is higher with a smaller checksum, going from about one if
-four billion with a 32-bit (4 byte) checksum to one is 65,536 for a
+detected is higher with a smaller checksum, going from about one in
+four billion with a 32-bit (4 byte) checksum to one in 65,536 for a
16-bit (2 byte) checksum or one in 256 for an 8-bit (1 byte) checksum.
The smaller checksum values can be used by selecting `crc32c_16` or
`crc32c_8` as the checksum algorithm.
BlueStore and FileStore are simply too different for that to be
practical. "Conversion" will rely either on the cluster's normal
replication and healing support or tools and strategies that copy OSD
-content from and old (FileStore) device to a new (BlueStore) one.
+content from an old (FileStore) device to a new (BlueStore) one.
Deploy new OSDs with BlueStore