[linux-lvm] lvm 0.8 to 1.0 transition?

[Friedrich Lobenstock]

"Heinz J . Mauelshagen" wrote:
> 
> In case you just want to update your LVM software, you don't need to
> vgexport/vgimport your VGs as described under that URL.
> 
> Presuming that you took backups of your data and metadata (/etc/lvmconf/*)
> and don't have root on a LV,

Yes root is on a LV on RAID1 and the data is on a LV on another RAID1

# uname -a
Linux www 2.4.0-test12-pre4-reiserfs-md-fixes #4 Fri Jan 19 14:48:29 CET 2001 i686 unknown

# cat /proc/lvm
LVM driver version 0.8final  (15/02/2000)
 
Total:  2 VGs  2 PVs  6 LVs (6 LVs open 6 times)
 
Global: 156410 bytes malloced   IOP version: 6   22:43:33 active
 
VG:  system-disk  [1 PV, 4 LV/4 open]  PE Size: 4096 KB
  Usage [KB/PE]: 9969664 /2434 total  9969664 /2434 used  0 /0 free
  PV:  [AA] md1                    9969664 /2434     9969664 /2434           0 /0
    LVs: [AWCL  ] swap                        524288 /128      1x open
         [AWDL  ] root                       2097152 /512      1x open
         [AWDL  ] tmp                         524288 /128      1x open
         [AWDL  ] var                        6823936 /1666     1x open
 
VG:  data-disk  [1 PV, 2 LV/2 open]  PE Size: 8192 KB
  Usage [KB/PE]: 78143488 /9539 total  55615488 /6789 used  22528000 /2750 free
  PV:  [AA] md3                   78143488 /9539    55615488 /6789    22528000 /2750
    LVs: [AWDL  ] 1                         18022400 /2200     1x open
         [AWDL  ] 2                         37593088 /4589     1x open

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/system-disk/root
                      2.0G  1.5G  522M  75% /
/dev/md0               50M   37M   13M  74% /boot
/dev/system-disk/tmp  512M   32M  480M   6% /tmp
/dev/system-disk/var  6.5G   92M  6.4G   1% /var
/dev/data-disk/1       17G   12G  5.1G  70% /mount/1
/dev/data-disk/2       36G   12G   24G  34% /mount/2

/dev/system-disk/ has PV /dev/md1
/dev/data-disk/ has PV /dev/md3

# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 hdc1[0] hda1[1]
      51264 blocks [2/2] [UU]
 
md1 : active raid1 hdc2[0] hda2[1]
      9970560 blocks [2/2] [UU]
 
md3 : active raid1 hdg1[1] hde1[0]
      78150592 blocks [2/2] [UU]

Therefore I will install a new system and I'll just take the disks
that belong to /dev/md3 and put them in this new system. So I'll
have the old system to put the disks back if anything goes wrong
in the new system. 

In the new system I just need to pvmove the the data onto the new 
disks, this time hardware RAID instead of software RAID, so no 
fancy stuff to get lilo boot with root on LV.

So how should I do it, just "vgscan;vgchange -ay" or do I need to
vgexport/vgimport and will this cause troubles?

-- 
MfG / Regards
Friedrich Lobenstock