topic LVM in Operating System - Linux

LVM

K.C. Chan — Wed, 13 Feb 2002 18:29:06 GMT

Does any know if rh7.2 comes with LVM utilities. Thanks.

Re: LVM

Kodjo Agbenu — Wed, 13 Feb 2002 22:56:05 GMT

Hello,

It seems that RedHat does not support LVM.

None of the RedHat distros currently supports LVM. Moreover, despite LVM is built in the kernel since 2.4.1, RedHat does not even compile the LVM driver as module that you could load manually.

If you want LVM with RedHat :

-> re-compile the kernel with LVM driver
-> install the LVM utilities
-> edit the /etc/rc.d/rc.sysinit file to add the two following lines :
vgscan
vgchange -a y

-> if the LVM is to be compiled as a module, don't forget to change your initial ramdisk (initrd) to add this. If you are not at ease with that, do not compile LVM as a module. It is better to have it directly included in the kernel.

Warning : if you decide to put some of the system mountpoints (/, /usr, ...) in LVM volumes, you must be aware by the fact that RedHat update bootable floppies or cd-roms won't work, because the kernel used during install/upgrade does not support LVM !

If you want a distro that is completely integrated with LVM, use SuSE or Mandrake.

Good luck.

Kodjo

Re: LVM

K.C. Chan — Thu, 14 Feb 2002 20:04:20 GMT

Could you explain how I could add this to the intial ramdisk. Is via command line or is it something I've to add in the kernel? Thanks.

Re: LVM

Eric Ladner — Fri, 15 Feb 2002 15:23:27 GMT

Once you build the kernel, say version 2.4.17, you just

$ mkinitrd /boot/initrd-2.4.17.img 2.4.17

The 2.4.17 part of the mkinitrd line has to match what the kernel was installed into /boot as (i.e. /boot/vmlinuz-2.4.17, the 2.4.17 part).

Cheers

Re: LVM

K.C. Chan — Fri, 22 Feb 2002 14:57:39 GMT

All, Thanks for your reply. I've found this out long time ago.