On Wed, May 14, 2003 at 11:06:39AM +0100, Neil, Mark wrote: > Dear All, > > I am trying to set up a volume managed file system over ordinary files using > the loopback devices. However whatever I try seems to work until I try and > actually use any logical volumes as file systems. Otherwise the volume > management system is completely happy with what I have done according to the > various display utilities > > What am I doing wrong? Likely the LVM version shipped with RedHat (1.0.3 ?). Try 1.0.7. Works fine with loop devices here. Regards, Heinz -- The LVM Guy -- > > As a simple example of this problem see below (all on a Redhat 9.0 system, > Kernel 2.4.20-9 - also fails in the same way on a Redhat 8 system with a > 2.4.18 kernel) > > [root@dex root]# dd if=/dev/zero of=/tmp/diskfile0 bs=512M count=1 > 1+0 records in > 1+0 records out > [root@dex root]# dd if=/dev/zero of=/tmp/diskfile1 bs=512M count=1 > 1+0 records in > 1+0 records out > [root@dex root]# dd if=/dev/zero of=/tmp/diskfile2 bs=512M count=1 > 1+0 records in > 1+0 records out > [root@dex root]# losetup /dev/loop0 /tmp/diskfile0 > [root@dex root]# losetup /dev/loop1 /tmp/diskfile1 > [root@dex root]# losetup /dev/loop2 /tmp/diskfile2 > [root@dex root]# pvcreate /dev/loop[0-2] > pvcreate -- physical volume "/dev/loop0" successfully created > pvcreate -- physical volume "/dev/loop1" successfully created > pvcreate -- physical volume "/dev/loop2" successfully created > > [root@dex root]# vgcreate test_vg /dev/loop[0-2] > vgcreate -- INFO: using default physical extent size 4 MB > vgcreate -- INFO: maximum logical volume size is 255.99 Gigabyte > vgcreate -- doing automatic backup of volume group "test_vg" > vgcreate -- volume group "test_vg" successfully created and activated > > [root@dex root]# lvcreate -L768M -n test_lv test_vg > lvcreate -- doing automatic backup of "test_vg" > lvcreate -- logical volume "/dev/test_vg/test_lv" successfully created > > [root@dex root]# mke2fs /dev/test_vg/test_lv > mke2fs 1.32 (09-Nov-2002) > Filesystem label= > OS type: Linux > Block size=4096 (log=2) > Fragment size=4096 (log=2) > 98304 inodes, 196608 blocks > 9830 blocks (5.00%) reserved for the super user > First data block=0 > 6 block groups > 32768 blocks per group, 32768 fragments per group > 16384 inodes per group > Superblock backups stored on blocks: > 32768, 98304, 163840 > > Writing inode tables: done > Writing superblocks and filesystem accounting information: done > > This filesystem will be automatically checked every 33 mounts or > 180 days, whichever comes first. Use tune2fs -c or -i to override. > [root@dex root]# mkdir /mnt/tmp > [root@dex root]# mount /dev/test_vg/test_lv /mnt/tmp > mount: you must specify the filesystem type > [root@dex root]# mount -t ext2 /dev/test_vg/test_lv /mnt/tmp > mount: wrong fs type, bad option, bad superblock on /dev/test_vg/test_lv, > or too many mounted file systems > [root@dex root]# e2fsck /dev/test_vg/test_lv > e2fsck 1.32 (09-Nov-2002) > Couldn't find ext2 superblock, trying backup blocks... > e2fsck: Bad magic number in super-block while trying to open > /dev/test_vg/test_lv > > The superblock could not be read or does not describe a correct ext2 > filesystem. If the device is valid and it really contains an ext2 > filesystem (and not swap or ufs or something else), then the superblock > is corrupt, and you might try running e2fsck with an alternate superblock: > e2fsck -b 8193 <device> > > [root@dex root]# > > Cheers > > Mark Neil > Imperial College > London > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
