> -----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..
