# export MDSCOUNT=2
# export MOUNT_2=y
# llmount.sh
...
u:~# cd /mnt/lustre
u:lustre# rm -rf d0/0 d1/0 d0 d1
u:lustre# ls
u:lustre# lfs mkdir -c4 -i0 d0
u:lustre# lfs mkdir -c4 -i0 d1
u:lustre# sleep 30
u:lustre# touch d0/0
u:lustre# sys_rename d0/0 d1/0
u:lustre# sys_stat d0/0
cannot stat `d0/0': No such file or directory
u:lustre# sys_rename /mnt/lustre2/d1/0 /mnt/lustre2/d0/0
u:lustre# sys_stat d0/0
cannot stat `d0/0': No such file or directory
u:lustre#
u:lustre# sys_stat d1/0
cannot stat `d1/0': No such file or directory
u:lustre# sys_getdents d0
d 180144002274689027 '..'
d 216172799293652995 '.'
d 144115188193296385 '..'
d 180144002274689027 '..'
d 234187197803134979 '.'
d 180144002274689027 '.'
r 234187197819912194 '0'
d 198158400784171011 '.'
d 180144002274689027 '..'
u:lustre# echo > d0/0
u:lustre# sys_stat d0/0
dev 743766374
ino 234187197819912194
mode 33188
nlink 1
uid 0
gid 0
rdev 0
size 1
blksize 4194304
blocks 8
atime 1397770152
mtime 1397770174
ctime 1397770174