[linux-lvm] lvm2 tools can't locate pvs on entire disks

[Miles Crawford]

On Tue, 10 May 2005, Klaus Strebel wrote:

> Miles Crawford schrieb:
>> 
>> I'm running into trouble here, getting the lvm scanning tools to notice PVs 
>> I have created on entire disks, like this:
>> 
>> pvcreate /dev/hdd
>> 
>> Some output:
>> 
>> root at end root # lvm version
>>   LVM version:     2.01.04 (2005-02-09)
>>   Library version: 1.01.00-ioctl (2005-01-17)
>>   Driver version:  4.1.0
>> root at end root # uname -a
>> Linux end.snip.net 2.6.8 #6 Sat Oct 9 20:59:02 PDT 2004 i686 GNU/Linux
>> root at end root # lvmdiskscan
>>   /dev/hda1  [      111.79 GB]
>>   /dev/hdb1  [       18.63 GB]
>>   /dev/hdd1  [      186.31 GB]
>>   /dev/hdb2  [      127.59 GB]
>>   /dev/hdb3  [        2.83 GB]
>>   0 disks
>>   5 partitions
>>   0 LVM physical volume whole disks
>>   0 LVM physical volumes
>> root at end root # pvscan
>>   No matching physical volumes found
>> 
>> Well that's odd, I know they're there.  Lets try this:
>> 
>> root at end root # losetup /dev/loop0 /dev/hda
>> root at end root # losetup /dev/loop1 /dev/hdd
>> root at end root # pvscan
>>   PV /dev/loop0   VG media_vg   lvm2 [111.79 GB / 0    free]
>>   PV /dev/loop1   VG media_vg   lvm2 [186.31 GB / 0    free]
>>   Total: 2 [298.10 GB] / in use: 2 [298.10 GB] / in no VG: 0 [0   ]
> Hi Miles,
>
> the disks hda and hdb obviously are partitioned (they are shown as /dev/hda1 
> and /dev/hdb1), so don't trying to detroy these partitions, he doesn't know 
> what the contents of, is good behaviour of lvm, isn't it ;-).
>
> Ciao
> Klaus

So, you're saying that although the lvm PVs are _not_ on partitions, 
the disklabel still describes some partition on the disk, so lvm is 
ignoring the disk as a whole as a possible PV?

-miles