Hi,
My eMMC device has a partition which reports the below output from df -h command: Filesystem Size Used Avail Use% Mounted on /dev/mmcblk2p3 16Z 16Z 84M 100% /data the partition is of size 100MB though! The partition is ext4 formatted. As can be seen above, the output reports huge values for Used space. in reality, the partition is just about 5MB used but for some reason df reports the huge value. When i check the partition used size via du -sh command, it reports the below: #du -sh 5.8MB I also checked the ouput via tune2fs command and below is what I get: Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 25688 Block count: 102400 Reserved block count: 5120 Overhead blocks: 50343939 Free blocks: 87634 Free inodes: 25190 First block: 1 Block size: 1024 Fragment size: 1024 Reserved GDT blocks: 256 Fragments per group: 8192 Inodes per group: 1976 Inode blocks per group: 247 Flex block group size: 16 Filesystem created: Thu Nov 21 06:38:03 2019 Last mount time: Thu Mar 10 13:20:58 2022 Last write time: Thu Mar 10 13:20:58 2022 Mount count: 31 Maximum mount count: -1 Last checked: Sat Jan 22 08:17:33 2022 Check interval: 0 (<none>) Lifetime writes: 604 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Any idea what is the Overhead blocks and why the Overhead blocks is showing a huge number? Though the output from df command indicates 100% usage, I am still able to create files in the partition. Any idea how to ensure df command returns the correct value instead of 100% usage or how to clear the "overhead blocks" listed in tune2fs? My script goes through the usage percentage of a partition and deletes off files if usage is >70%. Because df command always shows 100% usage it always deletes any files. Please let me know if df command is apt to use Or some other command like du i should use. Regards Ff
