[mdlug] LVM problem

[Jeff Hanson]

On Thu, Jul 10, 2008 at 12:47 PM, David Lee Lambert <lamber45 at msu.edu> wrote:
> I have a workstation with two 150-GB SATA drives.  I have a single LVM
> volume-group at the end of the second drive,  but I wanted to put more
> data in the volume-group or experiment with LVM's RAID-1 ability, so I
> warm-booted to a rescue-CD, ran "resizext2fs" and "fdisk" to shrink the
> root partition, and warm-booted back to Ubuntu Hardy.

Your setup seems backwards.  I did a md/RAID1 > LVM2 > LUKS/dm-crypt.
Putting LVM on RAID seems more logical to me although I don't know why
it wouldn't work the other way around or what the performance
differences would be.

> I thought I had made a 3-GB swap partition right after the end of the
> boot partition, and an unitialized LVM partiton after that:
>
> root at koios:~# fdisk -l /dev/sda
>
> Disk /dev/sda: 160.0 GB, 160000000000 bytes
> 255 heads, 63 sectors/track, 19452 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Disk identifier: 0x000c764e
>
>   Device Boot      Start         End      Blocks   Id  System
> /dev/sda1               1       11750    94381843+  83  Linux
> /dev/sda2           11751       19452    61866315    5  Extended
> /dev/sda5           11751       12116     2939863+  82  Linux swap / Solaris
> /dev/sda6           12117       19444    58862128+  8e  Linux LVM
>
> However,  when I try to initialize the partitions,  I can't do it
> directly with /dev/sdaX, and when I do it through /dev/mapper the sizes
> are wrong:
>
> root at koios:~# mkswap /dev/sda5
> /dev/sda5: Device or resource busy
> root at koios:~# mkswap /dev/mapper/sda5
> Setting up swapspace version 1, size = 96647000 kB
> no label, UUID=ae892961-2551-4135-b280-df56d16799a2

Something is really strange there.  Did you swapoff before you tried
to mkswap?  Check with the "free" command to see if swap was being
used.  Mine does go through mapper because it's on RAID then
encrypted.