Hi everyone,
In follow-up, I found an explanation of the superblock and free blocks at
http://www.angelfire.com/myband/binusoman/Unix.html#blocks
which suggests free blocks represents a segment of available storage and the last value of the segment points to another segment of free blocks, so it is reasonable for it to be smaller than the block values shown by df() and stat().
But the interaction of lvm, ext3 and maxsize set at creation time and the consequence of going beyond that is still uncertain.
-- Van Ly
-----Original Message-----
From: Van Ly
Sent: Sat 6/27/2009 11:13 AM
To: ext3-users@xxxxxxxxxx
Subject: free blocks count vs df() stat()
Hi,
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
/dev/mapper/vg0-commonlv
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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