>-----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(a)wdc.com wrote: > > > >> >> >> >> >>>-----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. > > did I mention i was using 2.6 kernel?? The 2.6 kernel compiled it as dm-mod Oh well.. I'll try again..