According to "man lvm", to add a physical volume to a volume group, the
right command is "vgextend" (the name is because you make a volume group
(VG) larger by adding more storage space for it, in a new physical
volume). To create a new volume group, the command is "vgcreate". But if
you want to add a filesystem, you *need not* (and very likely, should
not) add a volume group nor a physical volume. What you need is: (1)
Create a local volume within your existing volume groups; use lvcreate
for that. (2) Make a filesystem with "mkfs.ext4" (or similar, for other
filesystem type). (3) Optionally add a corresponding entry in /etc/fstab
and mount the new filesystem.
A typical structure is this (where "->" means "stored in"); it is not
the only possible layout, but it is likely the most common one and seems
to be the one you are using:
Files -> Filesystem -> LVM LV -> LVM VG -> LVM PV
-> Partition -> Disc or SSD
The structure is NOT hierarchical, and not all of these arrows represent
the same relationship between components. In particular, note that a LVM
VG does both grouping and ungrouping: It *takes* storage space from
(possibly several) physical volumes, and it *provides* storages space to
(possibly several) *logical volumes*.
The main information resource are the main pages. Also see
<http://www.tldp.org/HOWTO/LVM-HOWTO/index.html>. Do your own research.
El 25/10/15 a las 19:22, ray escribió:
Mario,
Thank you for the review.
Yes, there is free space in the LVM. I have gone through the manual many times
(today and the last several months) and don't see a method to add a pv or vg.
It seems to add a pv, it needs a device. And to add a vg, it needs a pv. How
can I add either?
Displaying the resize pv:
# pvdisplay -v -m
DEGRADED MODE. Incomplete RAID LVs will be processed.
Scanning for physical volume names
--- Physical volume ---
PV Name /dev/sda5
VG Name mycomp-vg
PV Size 55.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 14079
Free PE 1695
Allocated PE 12384
(the file system is smaller than the pv)
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 477G 0 disk
├─sda1 8:1 0 243M 0 part /boot
├─sda2 8:2 0 1K 0 part
└─sda5 8:5 0 476.7G 0 part
├─mycomp--vg-root 254:0 0 8.4G 0 lvm /
├─mycomp--vg-var 254:1 0 2.8G 0 lvm /var
├─mycomp--vg-swap_1 254:2 0 31.9G 0 lvm [SWAP]
├─mycomp--vg-tmp 254:3 0 380M 0 lvm /tmp
└─mycomp--vg-home 254:4 0 5G 0 lvm /home
