[linux-lvm] Only 4MB of space on a 1GB file mounted in loopback

Benjamin Henrion bh at udev.org
Wed Jul 7 13:32:49 UTC 2010


I have setup some LVM volume to test on a loopback file of 1GB, but I
end up with a file of 4MB, do you have any idea what went wrong?:

root at buzek /home/zoobab [22]# dd if=/dev/zero of=1G.img bs=1G count=1
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 13.6855 s, 78.5 MB/s
root at buzek /home/zoobab [23]# losetup -f
root at buzek /home/zoobab [24]# losetup /dev/loop5 1G.img
root at buzek /home/zoobab [25]#  pvcreate /dev/loop5
  Physical volume "/dev/loop5" successfully created
root at buzek /home/zoobab [26]# vgcreate testgroup /dev/loop5
  Volume group "testgroup" successfully created
root at buzek /home/zoobab [27]# lvcreate -i1 -l 1 -n testvol testgroup
  Redundant stripes argument: default is 1
  Logical volume "testvol" created
root at buzek /home/zoobab [28]# mkfs.ext3 /dev/testgroup/testvol
mke2fs 1.41.9 (22-Aug-2009)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
1024 inodes, 4096 blocks
204 blocks (4.98%) reserved for the super user
First data block=1
Maximum filesystem blocks=4194304
1 block group
8192 blocks per group, 8192 fragments per group
1024 inodes per group
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
root at buzek /home/zoobab [29]# mount /dev/testgroup/testvol  /mnt
root at buzek /home/zoobab [30]# cd /mnt
root at buzek /mnt [31]# df -lha
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              57G   46G  7.7G  86% /
proc                     0     0     0   -  /proc
none                     0     0     0   -  /sys
none                     0     0     0   -  /sys/fs/fuse/connections
none                     0     0     0   -  /sys/kernel/debug
none                     0     0     0   -  /sys/kernel/security
udev                  1.4G  260K  1.4G   1% /dev
none                     0     0     0   -  /dev/pts
none                  1.4G  900K  1.4G   1% /dev/shm
none                  1.4G  124K  1.4G   1% /var/run
none                  1.4G     0  1.4G   0% /var/lock
none                  1.4G     0  1.4G   0% /lib/init/rw
binfmt_misc              0     0     0   -  /proc/sys/fs/binfmt_misc
gvfs-fuse-daemon      0.0K  0.0K  0.0K   -  /home/zoobab/.gvfs
                      3.9M  1.1M  2.7M  29% /mnt
root at buzek /mnt [32]#

Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
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