RE: LVM-Howto [Was : what are the restrictions onbootablepartitions?]

From: Ow Mun Heng (ow.mun.heng_at_wdc.com)
Date: 04/30/04

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    Date: Fri, 30 Apr 2004 17:36:13 +0800
To: "For users of Fedora Core releases" <fedora-list@redhat.com>

    > -----Original Message-----
    > From: neil [mailto:neilcuk@aol.com]
    > 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@wdc.com wrote:
    >
    > >
    > >
    > >>-----Original Message-----
    > >>From: neil [mailto:neilcuk@aol.com]
    > >>
    > >>
    > >>mr700@globalnet.bg wrote:
    > >>
    > >>
    > >>
    > >>>On Friday 30 April 2004 05:11, Ow Mun Heng wrote:
    > >>>
    > >>>
    > >>>
    > >>>
    > >>>>>-----Original Message-----
    > >>>>>From: neil [mailto:neilcuk@aol.com]
    > >>>>>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@mindspring.com 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.. 

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