On 11/12/09 07:12, Bryn M. Reeves wrote:
On 12/10/2009 09:18 PM, Bob Goodwin wrote:
Yes, I posted the question and found the response interesting and
helpful. I spent a couple of hours reading man pages and
experimenting with the lvm commands on various drives.
But I have not been able to open a volume and list the directories
and files, such as /home and /etc! I must be dense ...
You cannot directly mount an LVM2 physical volume. The idea of the
volume manager is that it abstracts storage using a layered model:
Physical volumes - actual disks/storage devices
Volume groups - collections of related disks that are managed together
Logical volumes - virtual "partitions" carved out of the disks in the VG
The PV is a container for the LVs that exist in the volume group.
You need to activate any LVs that it contains using the commands in my
earlier mail before you can mount them.
LVs then behave a lot like regular partitions but with more
flexibility; they can be resized on the fly, mirrored, snapshotted,
migrated to new storage etc all without interruption to services.
When you activate an LV or a VG you will get new entries in the /dev
directory in a subdirectory named after the volume group. E.g. my VG
in the examples I gave was named "system" and it contains a half-dozen
or so LVs:
# ls /dev/system/
home root swap0 tmp usr var
[root@p380-1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
system 1 11 0 wz--n- 231.66G 88.81G
[root@p380-1 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
home system -wi-ao 100.00G
root system -wi-ao 21.03G
swap0 system -wi-ao 8.00G
tmp system -wi-a- 1.00G
usr system -wi-a- 8.00G
var system -wi-ao 4.00G
E.g. to mount the tmp logical volume (assuming it's active and not
already mounted), I would run:
mount /dev/system/tmp /tmp
Regards,
Bryn.
I haven't given up on this, it just takes time. I've printed the
list messages and comb-bound them in a booklet. Good reference for
now until I understand things better.
I was able to format an old Windows 2000 drive and create an ext4
file to which I copied /home/bob/ from the F-12 computer and all
that worked well.
And I've finally managed to display the files on an old F-10 pata
drive, that's a major accomplishment. But it seems this drive had a
boot partition which the other one did not and it mounted easily,
even automatically when the usb plug is inserted. That made things
easier.
I will eventually get all this worked out and perhaps even
understand the process eventually.
Thanks much for the help.
Bob
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