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Possible Duplicate:
ext4 partition size / free space discrepancies

I am simply confused by some output I'm seeing. When I run "df -h" the lines that are confusing me are as follows:

Filesystem                     Size   Used   Avail  Use%
/dev/mapper/sysvg-lvvideos     293G   4.5G   274G   2%

When I run "vgdisplay" I get:

--- Volume group ---
VG Name               sysvg
System ID
Format                lvm2
Metadata Areas        2
Metadata Sequence No  8
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                4
Open LV               4
Max PV                0
Cur PV                2
Act PV                2
VG Size               1.01 TiB
PE Size               4.00 MiB
Total PE              265251
Alloc PE / Size       120508 / 470.73 GiB
Free PE / Size        144743 / 565.40 GiB
VG UUID               4TjHj7-11CY-auM2-h05h-BXSV-2S4X-WUDh5R

When I run "lvdisplay sysvg" I get:

--- Logical volume ---
LV Name                /dev/sysvg/lvvideos
VG Name                sysvg
LV UUID                ZXNPP0-2IUI-UT1s-3riN-fxZH-QmfW-3OgwPI
LV Write Access        read/write
LV Status              available
# open                 1
LV Size                293.00 GiB
Current LE             75008
Segments               2
Allocation             inherit
Read ahead sectors     auto
- currently set to     256
Block device           254:2

What I don't get is: 293 - 4.5 does NOT equal 274. I have 14.5 GiB unaccounted for.

Community
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Jason
  • 11

1 Answers1

2

Thats because normally 5% of the space is reserved for the root user.

you can disable that by

tune2fs -m0 /dev/sysvg/lvvideos

EDIT

that has nothing to do with LVM, that's a "feature" of the chosen filesystem...

EDIT2

The manpage of mke2fs states the following

   -m reserved-blocks-percentage
          Specify the percentage of the filesystem blocks reserved for the
          super-user.   This  avoids  fragmentation, and allows root-owned
          daemons, such as syslogd(8), to continue to  function  correctly
          after non-privileged processes are prevented from writing to the
          filesystem.  The default percentage is 5%.

So yes that applies to all ext2/ext3/ext4 partitions.

andrekeller
  • 311