free blocks count vs df() stat()

Van Ly V.Ly at
Sat Jun 27 01:14:14 UTC 2009


Before going ahead with a fsck() and applying the
patches on a RedHat 5.x system that has important data, I checked the
numbers on the file system and depending on which way to look at
it, the number for free/available space left could be 116Gb (see
#1,3) or 24Gb (see #2).

Does anyone know which to believe, 116Gb or 24Gb is free? I have
diagnostic details appended below.

Also, if the volume was created with logvol() (see #4) with the maxsize
parameter used, does that affect later growth of the file system
beyond maxsize (see #3)? My superficial understanding of inodes and 
blocks does not extend to lvm() and how that affects creation-time parameters shown by tune2fs.

Thanks in advance,

Van Ly


# 1
# this comes close to 116Gb free <- `Available: 30246714`
# stat -f /common
  File: "/common"
    ID: 0        Namelen: 255     Type: ext2/ext3
Block size: 4096       Fundamental block size: 4096
Blocks: Total: 60944400   Free: 33391866   Available: 30246714
Inodes: Total: 62914560   Free: 62037005

# 2
# free blocks suggests there is 24Gb free
 tune2fs 1.39 (29-May-2006)
 Filesystem volume name:   <none>
 Last mounted on:          <not available>
 Filesystem UUID:          b78a127a-80d9-43e2-8f9c-143a82137eb8
 Filesystem magic number:  0xEF53
 Filesystem revision #:    1 (dynamic)
 Filesystem features:      has_journal ext_attr resize_inode dir_index
 filetype needs_re\
 covery sparse_super large_file
 Default mount options:    user_xattr acl
 Filesystem state:         clean
 Errors behavior:          Continue
 Filesystem OS type:       Linux
 Inode count:              62914560
 Block count:              62914560
 Reserved block count:     3145152
 Free blocks:              6417762
 Free inodes:              15443849
 First block:              0
 Block size:               4096
 Fragment size:            4096
 Reserved GDT blocks:      1009
 Blocks per group:         32768
 Fragments per group:      32768
 Inodes per group:         32768
 Inode blocks per group:   1024
 Filesystem created:       Thu Dec 18 12:06:47 2008
 Last mount time:          Sun Feb  1 07:25:25 2009
 Last write time:          Sun Feb  1 07:25:25 2009
 Mount count:              3
 Maximum mount count:      -1
 Last checked:             Thu Dec 18 12:06:47 2008
 Check interval:           0 (<none>)
 Reserved blocks uid:      0 (user root)
 Reserved blocks gid:      0 (group root)
 First inode:              11
 Inode size:               128
 Journal inode:            8
 First orphan inode:       30212898
 Default directory hash:   tea
 Directory Hash Seed:      15dea504-b626-476b-8513-fdc11b43abaf
 Journal backup:           inode blocks 

# 3
# volume has since been grown to 233Gb
# df -h /common
 Filesystem            Size  Used Avail Use% Mounted on
                       233G  105G  116G  48% /common 

# 4
# redhat kickstart created volume
logvol /common --fstype ext3 --name=commonlv --vgname=vg0 --size=512 --grow --maxsize=61440 

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