[Linux-cluster] Using cmirror

[Bernard Chew]

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Bernard Chew
> Sent: Wednesday, August 22, 2007 10:05 PM
> To: linux clustering
> Subject: RE: [Linux-cluster] Using cmirror

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Jonathan
Brassow
> Sent: Friday, August 10, 2007 11:01 PM
> To: linux clustering
> Subject: Re: [Linux-cluster] Using cmirror

> If you've set up a cluster and are using LVM, it will work the same
> way as single machine mirroring.

> http://www.redhat.com/docs/manuals/csgfs/browse/4.5/
> SAC_Cluster_Logical_Volume_Manager/mirror_create.html

>  brassow

> On Aug 10, 2007, at 6:56 AM, Bernard Chew wrote:

> Hi,
>
> I read that cmirror provides user-level utilities for managing cluster

> mirroring but could not find much documentation on it. Can anyone 
> point me to any documentation / guide around?
>
> Regards,
> Bernard Chew
> IT Operations
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster

> Hi all,

> I have problems creating a mirrored linear logical volume in a 3 nodes
cluster (using lvcreate -L 960M -m1 -n lv1 vg1 /dev/sdd /dev/sdb
/dev/sdc), and encounter the following errors:

> Error locking on node NodeA.hogwarts.com: device-mapper: reload ioctl
> failed: Invalid argument
> Error locking on node NodeB.hogwarts.com: device-mapper: reload ioctl
> failed: Invalid argument
> Error locking on node NodeC.hogwarts.com: device-mapper: reload ioctl
> failed: Invalid argument
> Failed to activate new LV

> I am able to create a linear logical volume without mirroring using
the same 3 pvs with GFS filesystem (clustered) but not the above. Any
help is appreciated.

> Thanks,
> Bernard Chew

Hi,

Managed to find out the reason; the cmirror modules were not loaded into
the kernel even though it was configured to start.

Regards,
Bernard Chew