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

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

[Gilles Guiot]

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.


-- 
Gilles Guiot
Responsable exploitation informatique
T�l. : 01 53 23 02 20
gilles.guiot@saros.fr

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

[xdub]

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.
>
>

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

[Gilles Guiot]

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 
filtering

xdub a �crit :
> 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.
>>
>>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


-- 
Gilles Guiot
Responsable exploitation informatique
T�l. : 01 53 23 02 20
gilles.guiot@saros.fr

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

[Stuart D. Gathman]

On Fri, 9 May 2008, Gilles Guiot wrote:

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

I actually prefer raid1, even though it uses more disks and has slower writes.

1) It is easy to use the mirrors apart from raid for recovery.  For instance, a
   clients motherboard died.  I had him ship me 2 of his 4 disks, from which I
   constructed a clone of his system on new hardware, and shipped it to him.
   He kept the other two as backup.

2) You do get some speedup for reads.

3) Disk space is cheap.

4) You can always use raid0+1 to speed up writes.

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.