I'm an out-of-my-depth PHP developer who has to deal with the following sysadmin problem.
We have an Ubuntu (Ubuntu 14.04.1 LTS) server running Xen (xen-hypervisor-4.4-amd64 4.4.0-0ubuntu5.1).
It has two physical disks (250GB and 2TB), each containing an LVM filesystem (/dev/sdb is the old 250GB, /dev/sda is the new 2TB).
root@xen:~# pvscan
PV /dev/sdb3 VG tiffany-vg lvm2 [232.17 GiB / 85.48 GiB free]
PV /dev/sda5 VG xen-vg lvm2 [1.82 TiB / 1.77 TiB free]
Total: 2 [2.05 TiB] / in use: 2 [2.05 TiB] / in no VG: 0 [0 ]
I need to move the group "tiffany-vg" to the new/larger disk (/dev/sda), with the aim of removing the older 250GB physical disk from the server. The target disk already contains another LVM group called "xen-vg" which must remain separate.
I want to move "tiffany-vg" to sit next to "xen-vg" on /dev/sda and I really need to not lose any data! I really don't want to cause any data loss?
I have probably used some terminology wrong and I am sure you understand what I am trying to say.
UPDATE:
The "target" disk (/dev/sda) currently looks like this ...
root@xen:~# parted /dev/sda
#...snip
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 2000GB 2000GB extended
5 257MB 2000GB 2000GB logical lvm