[linux-lvm] device /dev/sdb1 not found or ignored by filtering

Gilles Guiot gilles.guiot at saros.fr
Fri May 9 08:50:56 UTC 2008

Hello and thanks for the answer.
For "political" (indeed) reasons, we can't use the raid 5......

and there is a partition using the whole second "disk" (ie raid array), 
it is sdb 1. When I type the command pvcreate /dev/sdb or /dev/sdb1
i get the following message....device /dev/sdb1 not found or ignored by 

xdub a écrit :
> Hi,
> No sure what you want to do with your 2 raid1 arrays... and
> why you want to incorporate the first one into LV (?).
> Did you partition your second array ? if not, you can create a PV
> like this: pvcreate /dev/sdb. "pvcreate" can initialize a disk or 
> partition.
>    - pvcreate /dev/sdb
>    - vgcreate vg00 /dev/sdb
> Again, no sure what you want to do, but with 4 HD you should consider
> to build raid5 (hardware raid) and then create PV, VG, LV.
> Regards
> Gilles Guiot wrote:
>> Hello Everybody
>> I have two raid 1 arrays on a Dell PowerEdge 2950,
>> 1) 2*500 Go
>> 2) 2*750 Go
>> I need to use LVM, to create a LV on the second raid array, in which 
>> i will afterwards incorporate the first raid array. I have the latest 
>> debian distro installed, with kernel updates, and LVM2 is installed.
>> I encounter my first problem when typing pvcreate /dev/sdb1. ( the 
>> partition of the second raid array) I get the message :
>> device /dev/sdb1 not found or ignored by filtering
>> I checked /etc/lvm/lvm.conf, and I commented out the line about the 
>> filter.
>> After a reboot, no more luck. I tried to circumvent the problem by 
>> booting with an ubuntu CD, but i get the same error message.
>> Could anybody tip me about what's wrong and more importantly suggest 
>> solutions to me ? :-)
>> Thanks a lot in advance.
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Gilles Guiot
Responsable exploitation informatique
Tél. : 01 53 23 02 20
gilles.guiot at saros.fr

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