== sanity test 24s: mkdir .../R15a/b/c; rename .../R15a .../R15a/b/c =========================================================== 14:28:20 (1782757700)
rename '/mnt/lustre/R15a' returned -1: Invalid argument
/mnt/lustre/R15a has type dir OK
/mnt/lustre/R15a/b/c has type dir OK