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[linux-lvm] Adding another disk to Kubuntu/Ubuntu.



I'm using LVM on a Kubuntu setup that I now want to add another disk to. I've used software RAID before, but am new to LVM and am aware that one false move can render the whole lot unusable. I therefore feel the need for a bit of handholding! I've had a look at the docs and there seems to be a whole slew of utilities concerning LVM, some seem to be applicable to LVM1 and some LVM2 - which does little for my confidence in getting it right first time. (Perhaps I should have gone down the plain vanilla disk system route during the initial installation, but I was seduced by the hype concerning LVM!)

I _think_ I've created a new physical volume, ready to add to my filesystem, but am not certain what to do next. Output from pvscan is:

 PV /dev/hda5   VG Ubuntu   lvm2 [18.77 GB / 0    free]
 PV /dev/hdb1   VG Ubuntu   lvm2 [7.86 GB / 7.86 GB free]
 Total: 2 [26.64 GB] / in use: 2 [26.64 GB] / in no VG: 0 [0   ]

and output from lvmdiskscan:

 /dev/hda1 [      243.14 MB]
 /dev/hda5 [       18.78 GB] LVM physical volume
 /dev/hdb1 [        7.87 GB] LVM physical volume
 0 disks
 1 partition
 0 LVM physical volume whole disks
 2 LVM physical volumes

Output from DF is:
/dev/mapper/Ubuntu-root
                     18715076   6466152  11298244  37% /
tmpfs                   112264         0    112264   0% /dev/shm
tmpfs 112264 12588 99676 12% /lib/modules/2.6.12-10-386/volatile
/dev/hda1               233335     19166    201721   9% /boot


I want to add the 7.87GB /dev/hdb1 to the 18.78GB Ubuntu /dev/hda5 and would be grateful for any advice.

Jim Ford





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