Wrong df Command Output(Reserved block count)


“df” command shows  total capacity  of  mount  point  is  2.7TB .  Used  space  is  2.2TB  so  free  space must be  0.5TB   . The  problem  is that  available  space  is  4.0K .

#df -h

Filesystem    Size     Used     Avail    Use%      Mounted on
/dev/sdk1     2.7T     2.2T     4.0K     100%       /data/10


$strace  df -h


f_bavail=1  means that  there  is  only  one  block which available 4K . But  we know that  there must  be  nearly  500GB free space.

f_type=”EXT2_SUPER_MAGIC”, f_bsize=4096, f_blocks=721063224, f_bfree=146511617, f_bavail=1, f_files=183140352, f_ffree=183119269, f_fsid={-1946669160, -1538398616}, f_namelen=255, f_frsize=4096}) = 0


# tune2fs -l /dev/sdk1 | grep "Reserved block count"
Reserved block count: 146511616
# tune2fs -l /dev/sdk1 | grep "Reserved block count"
Block size: 4096



**How to  disable   “Reserved  block count” ?

#tune2fs -m 0 /dev/sdk1
#tune2fs -l /dev/sdk1|grep "Reserved block count"
Reserved block count:<strong> 0</strong>
#df -h

Filesystem    Size     Used     Avail    Use%      Mounted on

/dev/sdk1     2.7T    2.2T       559G    80%        /data/10


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I'm a IT Infrastructure and Operations Architect with extensive experience and administration skills and works for Turk Telekom. I provide hardware and software support for the IT Infrastructure and Operations tasks.

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