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

[Klaus Strebel]

Miles Crawford schrieb:
> 
> 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?
That's what it looks like, i'd guess lvm will use your whole-disk PVs if 
you get the partition table cleared. Without this, he'd destroy 
partitions of unknown types.

Ciao
Klaus
-- 
Mit freundlichen Grüssen / best regards

Klaus Strebel, Dipl.-Inform. (FH), mailto:klaus.strebel at gmx.net

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