Comment 2 for bug 1551272

I demo a "setup a slave for replicaion" based on https://www.percona.com/doc/percona-xtrabackup/2.3/howtos/setting_up_replication.html
this docs doesnt say anything about copy-back...

if i remove the .isl file, mysql wont start too:
...
2016-02-29 17:18:31 3454 [ERROR] InnoDB: Failed to find tablespace for table '"test"."t1"' in the cache. Attempting to load the tablespace with space id 6.
2016-02-29 17:18:31 3454 [ERROR] InnoDB: A tablespace for test/t1 has been found in multiple places;
2016-02-29 17:18:31 3454 [ERROR] InnoDB: Default location; ./test/t1.ibd, LSN=0, Space ID=6, Flags=1024
2016-02-29 17:18:31 3454 [ERROR] InnoDB: Dictionary location; /tmp/foo/test/t1.ibd, LSN=0, Space ID=6, Flags=1024
2016-02-29 17:18:31 3454 [ERROR] InnoDB: Will not open the tablespace for 'test/t1'
2016-02-29 17:18:31 7f4fdc26f700 InnoDB: cannot calculate statistics for table "test"."t1" because the .ibd file is missing. For help, please refer to http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html
...