Hi guys, sorry if this is trivial, but I have been googling a couple days and already compromised a test disk trying to figure this out, so I thought it is time to ask for some advice. I have a disk that comes from a clean and working CentOS4.2 install, and I am trying to use an external usb to ide converter to mount it on another workstation with CentOS4.2. I am trying this to better understand how LVM works, in the case of a future disaster/recovery scenario. Simply trying to mount it: mount -t ext3 /dev/sdc2 /share/ mount: wrong fs type, bad option, bad superblock on /dev/sdc2, or too many mounted file systems
fdisk -l shows /dev/sdc1 * 1 13 104391 83 Linux /dev/sdc2 14 7476 59946547+ 8e Linux LVM and in fact, /dev/sdc1 is automatically mounted.
vgscan reveals only my current volume group Found volume group "VolGroup00" using metadata type lvm2 (mount --> /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw))
lvmdiskscan --> /dev/sdc2 [ 57.17 GB] LVM physical volume ---> This being the volume I want to mount
lvscan detects only the volumes on my system ACTIVE '/dev/VolGroup00/LogVol00' [112.34 GB] inherit ACTIVE (root) '/dev/VolGroup00/LogVol01' [1.94 GB] inherit (swap)
If I run "vgchange -a y" --> 2 logical volume(s) in volume group "VolGroup00" now active, the ones in my system.
I went through LVM Howto, and also tried to follow a few "mount/recovery procedures" with the only result of compromising the other test disk. I think this the problem is that the vg on my system has the same name of the one on the external usb disk, but I am not sure of what result would have running vgrename, vgcreate or lvcreate on the data, so I'd rather wait for some advice.
Any help appreciated
Quoting Simone simone72@email.it:
I think this the problem is that the vg on my system has the same name of the one on the external usb disk, but I am not sure of what result would have running vgrename, vgcreate or lvcreate on the data, so I'd rather wait for some advice.
This would indeed be a problem. You might try disconnecting your internal drive, booting off rescue CD and renaming the volume group on external drive. Alternative to that would be to wipe out the external drive (if you don't have any data on it) and recreate it from scratch.
BTW, you can't mount partition that is marked as physical volume directly. You need to access logical volumes on it through LVM devices (usually /dev/vg-name/lv-name).
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Thanks for your reply. I managed to boot off an ubuntu live cd (lvm named differently) and get the device properly mapped, booting with the drive plugged in the usb port worked (as you say mount /dev/VolGroup...etc). My next step will be trying to rename the volume group (vgrename suggestions welcome). If I don't damage it, then I will try to put it back in the pc and boot and see what I get.
Thanks again, have a nice weekend
Aleksandar Milivojevic wrote:
Quoting Simone simone72@email.it:
I think this the problem is that the vg on my system has the same name of the one on the external usb disk, but I am not sure of what result would have running vgrename, vgcreate or lvcreate on the data, so I'd rather wait for some advice.
This would indeed be a problem. You might try disconnecting your internal drive, booting off rescue CD and renaming the volume group on external drive. Alternative to that would be to wipe out the external drive (if you don't have any data on it) and recreate it from scratch.
BTW, you can't mount partition that is marked as physical volume directly. You need to access logical volumes on it through LVM devices (usually /dev/vg-name/lv-name).
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Aleksandar Milivojevic -
Simone