Unrecognised LVM device type

Hi

Sorry to post this again but my attempts to register with the mailing list failed so badly I have no way of knowing if my original email made it....

No doubt I'm being stupid but I cannot find a whole load of documentation on device mapper and LVM2 - there's a certain amount with the source but it's more what I'd call a rough guide.

My problem is I cannot create a PV (let alone a logical Vol) on a devicemapped device.

I am using a stock 2.4.22 kernel with the latest stable dm and LVM2 stuff from the sistina web site.

if I use "lvm version" I get the following

LVM Version 2.00.08 (2003-11-14)
Library Version 1.00.07-ioctl (2003-11-21)
Driver 4.0.5

The kernel patches, the compiles went perfectly and I can see the device mapper stuff loaded (I've compiled the dm and lvm stuff in statically) at boot time. I run the mknod scripts at boot up as well.

I have managed to create a simple stripe using hda4 and hdc4 partitions and I have a lovely big devicemapper device called bigdisk.

The special file for this is in /dev/mapper/bigdisk and has major 254 and minor of 0.

I can create any regular file system on this device mount it and use it.

If I try to initialise this with pvcreate as in

lvm pvcreate -vvv /dev/mapper/bigdisk

it fails. The ominous line is:

/dev/mapper/bigdisk: Skipping: Unrecognised LVM device type 254

That's it I cannot progress further than that.

I am using the sample lvm.conf file that came with the LVM2 code. Initially I had no lvm.conf file (just for testing) and it did not work.

I have created a LVM on /dev/hdd4 and that works perfectly so I know the general installation must be good - well I assume it is!

I know that I have to be missing something obviously simple but without any doccos I am stumped.

Can anyone help - I hope someone else is trying to create LVs on devicemapper type devices.

Mark

_________________________________________________________________
Sign-up for a FREE BT Broadband connection today! http://www.msn.co.uk/specials/btbroadband

/dev/mapper/bigdisk is not contained in /etc/lvm/.cache.
YOu need to change your /etc/lvm/lvm.conf device name filter to include it.

Why do you want to create such bigdisk and use it as a PV ? Just create PVs on hd[ac]4 and use LV striping.

Regards,
Heinz -- The LVM Guy --

*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen Red Hat, Inc.
Consulting Development Engineer Am Sonnenhang 11
56242 Marienrachdorf Germany
[email protected] +49 2626 141200

                                                       FAX 924446

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-