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Old 02-15-2006, 03:23 AM   #1
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problem mounting LVM


I am having a problem mounting an LVM partition. Basically , I have had to do a fresh install of centos4.2 on a new drive. I need to mount the root partition from the old drive. The old drive is not damaged in anyway and still works. I need to mount /dev/hdc2 so i can access the data. Here are my results:

[root@server /]# mount /dev/hdc2 /oldroot
mount: /dev/hdc2 already mounted or /oldroot busy

Here is the fdisk -l info:

Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 274 2096482+ 82 Linux swap
/dev/hda3 275 535 2096482+ 83 Linux
/dev/hda4 536 24321 191061045 5 Extended
/dev/hda5 536 24321 191061013+ 83 Linux

Device Boot Start End Blocks Id System
/dev/hdc1 * 1 13 104391 83 Linux
/dev/hdc2 14 9729 78043770 8e Linux LVM

/dev/hdc1 obviously has no issue mounting. The /oldroot directory in which i am trying to mount to is completely empty and is does not have any partitions mounted to it. Any help/suggestions would be awsome.

Old 02-15-2006, 08:27 AM   #2
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surely the old root wont be in your lvm tab? also, you dont specify a file system type in your mount command....
Old 02-15-2006, 08:42 AM   #3
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It's telling you something is already in use/busy.

Try running lsof against both the device and the mount point to see if either is in fact actually in use.
Old 02-15-2006, 12:29 PM   #4
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You don't mount an LVM partition directly. You mount the logical volumes contained within the LVM partition. The error message you're getting is misleading, to say the least. But I think the root cause of your problem is the incorrect way you're attempting to use the partition.

See the LVM mounting example from my system below. I have LVM on /dev/sd8 but you can see that /dev/sd8 is NOT directly mounted anywhere. The individual LV's inside the LVM partition are mounted, e.g., /dev/mapper/vg0-usr is mounted on /usr, /dev/mapper/vg0-var is mounted on /var, etc.
# fdisk -l

Disk /dev/sda: 160.0 GB, 160000000000 bytes
255 heads, 63 sectors/track, 19452 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        5099    40957686    7  HPFS/NTFS
/dev/sda2            5100       10199    40965750    7  HPFS/NTFS
/dev/sda3           10200       14024    30724312+   c  W95 FAT32 (LBA)
/dev/sda4           14025       19452    43600410    f  W95 Ext'd (LBA)
/dev/sda5   *       14025       14030       48163+  83  Linux
/dev/sda6           14031       14091      489951   82  Linux swap / Solaris
/dev/sda7           14092       14213      979933+  83  Linux
/dev/sda8           14214       19452    42082236   8e  Linux LVM
# mount
/dev/sda7 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
usbfs on /proc/bus/usb type usbfs (rw)
/dev/sda5 on /boot type ext3 (rw)
/dev/mapper/vg0-usr on /usr type ext3 (rw)
/dev/mapper/vg0-var on /var type ext3 (rw)
/dev/mapper/vg0-opt on /opt type ext3 (rw)
/dev/mapper/vg0-tmp on /tmp type ext3 (rw)
/dev/mapper/vg0-home on /home type ext3 (rw)
/dev/sda1 on /mnt/windows/c type ntfs (ro,umask=0222)
/dev/sda2 on /mnt/windows/d type ntfs (ro,umask=0222)
/dev/sda3 on /mnt/windows/e type vfat (rw,umask=0000)
tmpfs on /dev type tmpfs (rw,size=10M,mode=0755)
Here are the LVM related entries in my /etc/fstab:
# Logical Volume Management (LVM2 on /dev/sda8)
# Note: /usr/local is symlinked to /opt
/dev/mapper/vg0-usr  /usr       ext3    defaults                     0       2
/dev/mapper/vg0-var  /var       ext3    defaults                     0       2
/dev/mapper/vg0-opt  /opt       ext3    defaults                     0       2
/dev/mapper/vg0-tmp  /tmp       ext3    defaults                     0       2
/dev/mapper/vg0-home /home      ext3    defaults                     0       2


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