Re: LVM, MD, what's what?
Hi,
Alec Smith <alec@shadowstar.net> writes:
> Right now I've got a 10GB drive split into 4 partitions (/, /boot, /home, and
> swap). I'd like to add another drive to the system, adding its space to /home,
> which is /dev/hda7 under my current setup. The machine currently runs kernel 2.2.18
> and will be upgraded to 2.4.x once a few point releases are out.
I run kernel 2.2.18 and lvm 0.9.beta3.
> How can I go about using Multiple Disks and/or LVM to manage this addition? Is
> there a HOWTO someplace I should be looking at? I'm also thinking about converting
> from ext2 to ReiserFS at some point and would be interested in knowing about any
> gotchas it would involve as far as MD/LVM are concerned.
I would suggest the following:
Install lvm from http://www.sistina.com/lvm/ and install it following
the INSTALL file. Eventually add reiserfs-patches to your kernel
before rebulding it.
Add the new drive, and create 10 partitions, type 8e, each 1G.
# pvcreate /dev/hdb[1-9] /dev/hdb10
Then look how much space you need for /usr, /var, /tmp and create a
volume group for them:
If you need btween 3 and 4G, then do
# vgcreate root_vg /dev/hdb[1-4]
# lvcreate -n usr_lv -L <size_of_usr> root_vg
# lvcreate ... (...means do this also for var_lv and tmp_lv)
# mkreiserfs /dev/root_vg/usr_lv ...
# mkdir /usr_new
# mount -t reiserfs /dev/root_vg/usr_lv /usr_new ...
# cd /usr
# find . -print | cpio -dmp ../usr_new
# ...
Act like this with home_vg, local_vg or whatelse you need.
Then change vou /etc/fstab to the new devices and reboot. Leave the
root-partition and eventually /boot where it is. If everything is ok,
mount says tha /usr is on /dev/root_vg/usr_lv ..., then you can
pvcreate the old partitions and vgextend your volume groups. I left /
(200G) non-lvm and ext2, so I can boot from a normal debian - CD, but
there are also ways for putting root under lvm-control and reiserfs.
If you need further assistance then send me a mail.
Greetings, Christoph
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