I try to find a solution for incremental backup on a mysql 5.5 innodb engine that use a raw disk partition for my database.
This is my configuration from my.cnf read by the tool:
xtrabackup: innodb_data_home_dir =
xtrabackup: innodb_data_file_path = /dev/sdb:200Graw
 Copying /dev/sdb to /root/xtrabackup_backupfiles/sdb
log scanned up to (18032549002)
innobackupex --user=xxxxx --password=xxxxx /tmp
Unfortunately the data from /dev/sdb raw disk is not saved.
Does xtrabackup tool support this kind of backup?
What command should be used in this case?