ow.mun.heng@xxxxxxx wrote:
-----Original Message-----
From: neil [mailto:neilcuk@xxxxxxx]
Sent: Friday, April 30, 2004 5:26 PM
To: For users of Fedora Core releases
Subject: Re: LVM-Howto [Was : what are the restrictions
onbootablepartitions?]
ow.mun.heng@xxxxxxx wrote:
-----Original Message-----
From: neil [mailto:neilcuk@xxxxxxx]
mr700@xxxxxxxxxxxx wrote:
On Friday 30 April 2004 05:11, Ow Mun Heng wrote:
-----Original Message-----
From: neil [mailto:neilcuk@xxxxxxx]
Sent: Thursday, April 29, 2004 10:35 PM
To: For users of Fedora Core releases
Subject: Re: what are the restrictions on bootable partitions?
rpjday@xxxxxxxxxxxxxx wrote:
what are the restrictions on where i can install another
linux distro
onto my fedora core (actually, FC2-t3) system so that grub
can find it?
(even though this is a test version of fedora, this
question actually
refers to FC distros in general.)
There are no restrictions other than the boot loader (grub)
must be able
to read the boot partition.
typically, for historical reasons, even when i use LVM, i
create a small
primary, ext3 filesystem for /boot, and use LVM for the rest
of the drive.
is there any compelling reason for doing this anymore?
what's the
recommended strategy for LVM? and need for a non-LVM
filesystem on newer
machines?
It really depends on what the system will be used for.
Check out the
howto here: http://www.tldp.org/HOWTO/LVM-HOWTO/index.html
I've actually looked through the howto but am still unable
to determine
how to actually create a lvm system. I've recompiled my kernel to
have the devive mapper as a module and modprobe'ed it.
When I try to do vgscan it states that the kernel modules
are not loaded.
I don't remember how I did this with RH9 to make it
work, but I remember
I played a bit whth modprobe, the LVM tools and the man pages :)
Please help.
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/s
ysadmin-guide/ch-lvm.html
http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/s
ysadmin-guide/ch-lvm-intro.html
http://www.redhat.com/docs/manuals/linux/RHL-8.0-Manual/custo
m-guide/ch-lvm.html
http://www.redhat.com/docs/manuals/linux/RHL-8.0-Manual/custo
m-guide/ch-lvm-intro.html
http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-
guide/ch-lvm-intro.html
...
I did install FC1 with Software Raid 5 and LVM on top of
it, but doing so on less
than three physical disks results to up to 5 times slower
transfer (because of the
raid). If you have 3 disks read speed increases and the
write speed is almost the
same. Using ReiserFS I was able to resize 61G LV to 64G LV
without errors. With
ext3 it worked, but fsck.ext3 had a lot of work to do (the
partition was ~50G full).
I hope one day online resize will work with bouth and
reiserfs will get more stable
with acl and SELinux support.
http://www.aplawrence.com/Linux/lvm.html
ps: putting the /boot partiton ouside the LVM worked
fine for me.
okay - there are a few steps one needs to take to get their
system using
LVM. It can be tricky to get your brain around at first but
it will slot
into place. The steps are quite straight forward - even when
setting up
post install. Here's a brief overview. I'm assuming you can
follow the
man pages of each of the commands specified - there are a number of
options which will be up to you:
as root
One(a): Make sure you have backed up any important data
before trashing
your system ;-)
One: make sure your kernel supports LVM (By default this is
supported in
FC1)
Two: create some LVM partitions (of type 8e under fdisk)
Three: reboot or execute partprobe
Four: execute vgscan
Five: use pvcreate to assign your newly typed disks as use
within the LVM
(actually, four and five might be back to front)
Six: use vgcreate to generate a new volume group (and add
some physical
volumes tro it)
Seven: use lvcreate to make your logical volume
Eight: format your new logical volume
then it's up to you - mount as you like
use e2fsadm to extend and reduce the size of the volume
There is a huge amount of documentation and you should
really get to
grips with resizing, adding new PVs etc. Before you start
putting useful
data on your new LV!
Thanks for the info Neil. I think I do have a hang of it..
sort of anyway.
So, what you're saying is that I have to create the LVM
partition using
fdisk
1st before I can get to execute vgscan??
Currently I just type vgscan and then it complains
vgscan -- LVM driver/module not loaded??
(it's loaded. The module is named dm-mod.ko right??)
you've got me there. It should be 'lvm-mod' that gets loaded. try a
manual 'modprobe lvm-mod'. If that works try running 'depmod'
to setup
the module dependancies again. Sounds like something is missing the
mark. Create one or two partitions using fdisk and try vgscan again.
did I mention i was using 2.6 kernel??
The 2.6 kernel compiled it as dm-mod
Oh well.. I'll try again..
ahh - just read through the thread again :-) sorry - I have no
experience with the test release as of yet - i've been using wget to
fetch the dvd.iso but there's a two gig limit bug which caught me out a
few times. I'm still dling FCt3 -- maybe once I have it running I han
help further. Let me know how you get on in the meantime.
neil
P.S. It's Friday at least :-D
