I am using XFS on small HDD (/dev/sdb1, less than 1TB) and storing many small files (-32KB). df -h and -i show that it has available space. # df -hv Filesystem Size Used Avail Use% Mounted on /dev/sda3 127G 19G 102G 16% / tmpfs 16G 0 16G 0% /lib/init/rw udev 16G 168K 16G 1% /dev tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 99M 20M 75M 21% /boot /dev/sdb1 136G 123G 14G 91% /mnt/sdb1 # df -iv Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 8421376 36199 8385177 1% / tmpfs 4126158 5 4126153 1% /lib/init/rw udev 4124934 671 4124263 1% /dev tmpfs 4126158 1 4126157 1% /dev/shm /dev/sda1 26112 222 25890 1% /boot /dev/sdb1 24905120 11076608 13828512 45% /mnt/sdb1 However I got No space left on device error. # touch /mnt/sdb1/test touch: cannot touch `/mnt/sdb1/test': No space left on device I think inode64 issue is not related to this case because drive is less than 1TB and df -i shows that there are free inodes. I unmounted and mounted with -o inode64 but got the same error. xfs_repair does not report any problem. xfs_info shows drive information as follows. # xfs_info /dev/sdb1 meta-data=/dev/sdb1 isize=1024 agcount=16, agsize=2227764 blks = sectsz=512 attr=2 data = bsize=4096 blocks=35644210, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=17404, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 Any ideas? Thanks!