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Re: lvm

>>>>> "JM" == Julio Merino <juli@merino.net> writes:

   JM> Hi all,
   JM> I have now a currently working Potato system organized in simple
   JM> partitions as I posted in another message. Well, my question is about
   JM> how can I use LVM.

   JM> Can I convert my current installation structure in a LVM one ? Do I
   JM> have to reinstall all my system ? HOW ?
   JM> Potato install doesn't contemplates LVM.

Hi,

that´s the way I did it:

I installed lvm deb

cg@deepthought:~$ dpkg -l lvm
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  lvm            0.8i-3         The Logical Volume Manager for Linux

Then I patched my Kernel 2.2.17 with

patch-2.2.16-LVM-0.8i ( http://linux.msede.com/lvm/ )
linux-2.2.17-reiserfs-3.5.25-patch ( http://devlinux.com/projects/reiserfs/ )

and recompiled with lvm and reiserfs compiled in ( not as modules ).

The I did a vgscan (after reboot), pvcreate on spare partitions ( I
repartitioned a disk with parted to 500MB - Partitions, so I can reassign
them to different volume groups), vgcreate and lvcreate, and copied my
existing partitions to the new ones, e.g.

# vgscan
# pvcreate /dev/hdb[12345]
# vgcreate root_vg /dev/hdb[12345]
# lvcreate -L 1G -n usr_lv root_vg
# mkreiserfs /dev/root_vg/usr_lv
# mkdir /usr_new
# mount -t reiserfs /dev/root_vg/usr_lv /usr_new
# cd /usr
# find . -print | cpio -dpm ../usr_new

and also for all other partitions

Then I edited /etc/fstab to point to the new partitions, rebooted and ready.

The I pvreated the old partitions, added them to the right volume group, and
pvmoved the /dev/hdb[12345] back to /dev/hdb. Here´s my mount - output:

cg@deepthought:~$ mount
/dev/hda1 on / type ext2 (rw,errors=remount-ro,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/root_vg/var_lv on /var type reiserfs (rw)
/dev/root_vg/usr_lv on /usr type reiserfs (rw)
/dev/root_vg/home_lv on /home type reiserfs (rw)
/dev/root_vg/tmp_lv on /tmp type reiserfs (rw)
/dev/local_vg/local_lv on /usr/local type reiserfs (rw)
/dev/local_vg/apt-mirror_lv on /usr/local/apt-mirror type reiserfs (rw)

The / - partition can also be brought under lvm-control, but the you need to
boot in a initial ramdisk before mounting the physical partiton on your HD.

This system works without any hassles, and I moved and resized very much. I
recommend using reiserfs, it does journaling, and comes up very fast after a
power failure or cold reboot.

If you have any questions, send me a mail.

Here some konfiguration outputs:

root@deepthought:/home/cg# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE   PV "/dev/hda10" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda11" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda12" of VG "local_vg" [500 MB / 476 MB free]
pvscan -- ACTIVE   PV "/dev/hda13" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda14" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda15" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda16" of VG "local_vg" [500 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda5"  of VG "root_vg"  [996 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda6"  of VG "root_vg"  [2.93 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda7"  of VG "root_vg"  [996 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda9"  of VG "root_vg"  [500 MB / 500 MB free]
pvscan -- inactive PV "/dev/hdb1"  is in no VG  [502 MB]
pvscan -- inactive PV "/dev/hdb2"  is in no VG  [502.03 MB]
pvscan -- inactive PV "/dev/hdb3"  is in no VG  [502.03 MB]
pvscan -- inactive PV "/dev/hdb5"  is in no VG  [502 MB]
pvscan -- inactive PV "/dev/hdb6"  is in no VG  [502 MB]
pvscan -- inactive PV "/dev/hdb7"  is in no VG  [502 MB]
pvscan -- inactive PV "/dev/hdb8"  is in no VG  [502 MB]
pvscan -- inactive PV "/dev/hdb9"  is in no VG  [619.66 MB]
pvscan -- total: 19 [12.83 GB] / in use: 11 [8.79 GB] / in no VG: 8 [4.04 GB]

root@deepthought:/home/cg# lvscan
lvscan -- ACTIVE   "/dev/local_vg/local_lv" [1.95 GB]
lvscan -- ACTIVE   "/dev/local_vg/apt-mirror_lv" [1 GB]
lvscan -- ACTIVE   "/dev/root_vg/usr_lv" [2.73 GB]
lvscan -- ACTIVE   "/dev/root_vg/var_lv" [152 MB]
lvscan -- ACTIVE   "/dev/root_vg/home_lv" [1 GB]
lvscan -- ACTIVE   "/dev/root_vg/tmp_lv" [1012 MB]
lvscan -- 6 logical volumes with 7.82 GB total in 2 volume groups
lvscan -- 6 active logical volumes

Greetings, Christoph
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