problems with lvm configurations

Joseph Rawson umeboshi3 at gmail.com
Sat Oct 4 01:48:49 CEST 2008


I've been having some problems when using lvm configurations.  The normal 
partitioning, and the raid configurations are both working just fine.  I 
haven't tried testing "preserve" or anything fancy.  When using raid, the 
disk_var.sh still shows /dev/md0 as the boot device.  I don't know if this 
what's intended or not.  The way I've been handling this is as follows:

if bootdevice starts with '/dev/md' then
	look for /boot/grub/device.map
	if device.map doesn't exist then
		run "grub-mkdevicemap -n"
	search device.map for (hd0) and get device entry for (hd0) (usually /dev/hda)
use /dev/hda as boot device

I should probably fix the code to use every active disk in the array, so the 
machine will boot in case of disk failure.

The lvm seems to work well, when the disk is brand new.  I'm using virtualbox 
to do all the testing in, so making a "new" drive is cheap. :)  Anyway, after 
the first run using lvm (the first run always seems to work fine), doing it a 
second time won't work.  Also switching back to a normal partitioning scheme 
won't work, and I have to make a new disk image.  Also dd'ing a lot of zero's 
to the drive doesn't seem to work either, although I think doing that in 
combination with vgremove may work.  There's too many options for me to 
remember all my steps.

I've just noticed that you have experimental4 on the website now, and all 
these problems are based off of experimental3, so I'm going to install the 
new packages and try them out before I send a more detailed report.

Thanks for making the new packages! :)

-- 
Thanks:
Joseph Rawson
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