>-----Original Message-----
>From: neil [mailto:neilcuk@aol.com]
>
>
>mr700(a)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(a)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.
neil