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Re: Adding LVM to an existing system

Dick Davies wrote:

On 17/11/05, Marc Shapiro <mshapiro_42@yahoo.com> wrote:



/dev/hda12      2201+   4864    2664-  21398548+  8e  Linux LVM

root@xander:~# pvcreate /dev/hda12
  Device /dev/hda12 not found.


As you can see, pvcreate does not appear to want to work on /dev/hda12.
 This was the case with partiton type 83 as well.



That's weird. All I can say is that it's definitely possible to do LVM on
logical partitions. Here's my laptop :

 rasputnik@hypnotoad:~$ sudo fdisk -l /dev/hda
Password:

Disk /dev/hda: 30.0 GB, 30005821440 bytes
16 heads, 63 sectors/track, 58140 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1       20799    10482381    c  W95 FAT32 (LBA)
/dev/hda2           20799       46586    12996585    5  Extended
Partition 2 does not end on cylinder boundary.
/dev/hda3           46586       52132     2795310   83  Linux
Partition 3 does not end on cylinder boundary.
/dev/hda5   *       20799       21373      289138+  83  Linux
/dev/hda6           21373       23317      979933+  82  Linux swap / Solaris
/dev/hda7           23317       29134     2931831   8e  Linux LVM
/dev/hda8           29134       34951     2931831   8e  Linux LVM
/dev/hda9           34952       40769     2931831   8e  Linux LVM
/dev/hda10          40769       46586     2931831   8e  Linux LVM
rasputnik@hypnotoad:~$ sudo pvs
  PV         VG    Fmt  Attr PSize PFree
  /dev/hda10 biglv lvm2 a-   2.79G 52.00M
  /dev/hda7  biglv lvm2 a-   2.79G     0
  /dev/hda8  biglv lvm2 a-   2.79G     0
  /dev/hda9  biglv lvm2 a-   2.79G     0
It does seem odd. Are you using Sid, or Etch? I am running Sarge. Could that make a difference?
When I juggled some stuff around so that I was able to get a primary partition that I could play with (/dev/hda1) I was able to run: 

	pvcreate /dev/hda1
        vgcreate vg /dev/hda1
        lvcreate -L200 -n test vg

with no problems.
I then created a file system and mounted the volume just like any other. This workd with ext2 and reiserfs.
By the time I juggle the data enough to get a large enough primary partition, if I can, it would be easier to leave it as it is and not bother with LVM, except that having the LVM will make it easier the next time. It would be much simpler if LVM on my box would let me use logical partitions, but that is, apparently, not to be. 

--
Marc Shapiro
mshapiro_42@yahoo.com
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