Thread: LVM mysteries in Ubuntu

hi, need answering questions lvm:

had hard drive failure, , had reload system scratch. decided use lvm (for first time) when reloaded lucid. used alternate install cd install 10.04 lvm, using defaults. works fine, , since have done enough research on lvm understand structure overall. installation this: single 250gb hd small boot partition , rest of disk extended partition 250gb lvm2 physical volume.

here results of pvdisplay, vgdisplay and lvdisplay

pvdisplay

--- physical volume ---
pv name /dev/sda5
vg name ubuntu
pv size 232.65 gib / not usable 2.00 mib
allocatable yes
pe size 4.00 mib
total pe 59557
free pe 1
allocated pe 59556
pv uuid xuuca1-z20y-hfzv-kcti-19js-wabb-uzjjin


--- volume group ---
vg name ubuntu
system id
format lvm2
metadata areas 1
metadata sequence no 3
vg access read/write
vg status resizable
max lv 0
cur lv 2
open lv 2
max pv 0
cur pv 1
act pv 1
vg size 232.64 gib
pe size 4.00 mib
total pe 59557
alloc pe / size 59556 / 232.64 gib
free pe / size 1 / 4.00 mib
vg uuid mgllec-l7wy-4v97-dwi1-sgy8-xh76-2qnrj1


lvdisplay

--- logical volume ---
lv name /dev/ubuntu/root
vg name ubuntu
lv uuid 0ky33v-mcnh-aevy-oa3u-rdzd-wt6x-wvtyzk
lv write access read/write
lv status available
# open 1
lv size 224.02 gib
current le 57349
segments 1
allocation inherit
read ahead sectors auto
- set 256
block device 252:0

--- logical volume ---
lv name /dev/ubuntu/swap_1
vg name ubuntu
lv uuid oubkdw-xvrw-rsel-zqzz-go8d-fp3o-3pj5va
lv write access read/write
lv status available
# open 1
lv size 8.62 gib
current le 2207
segments 1
allocation inherit
read ahead sectors auto
- set 256
block device 252:1








i leave way , not think anymore it, but the hard drive failure made me serious backing things , partitioning hard drive.

in old scheme, have set separate home partition during installation easy backup pointing backup program @ home directory's /dev name, lvm has many more components such process becomes more murky. part of problem during installation did not know know lvm , blindly accepted defaults setting lvm, , consequence, have single large lv holds everything. want have /home directory on separate lv can backed itself, able before installing lvm. under old way, handle partition management booting handy linux system rescue cd , use partitioning tool resize or create/delete partitions.

given here questions having hard time answering:

1) how can break new lv off of /dev/ubuntu/root lv /home data?

2) how make external backups of data organized logical volumes?

3) standard rescue cd partitioning tools apply working lvm partitions/volume groups/logical volumes?

helping these questions.

you can move home, need downsize lvm.

http://tldp.org/howto/lvm-howto/reducelv.html

http://fedorasolved.org/members/zcat...-new-partition

http://fedorasolved.org/members/zcat...ome/a-new-home

can use lvm snapshots

http://tldp.org/howto/lvm-howto/snapshots_backup.html

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