[Linux-cluster] CLVM and SCSI-3 Reservations

[Ryan O'Hara]

Sadek, Abdel wrote:
> Is CLVM a requirement for SCSI-3 Persistent Reservations to work on a 
> RHEL 5.0 native cluster?

Yes.

> I have a 2-node cluster. If I build my file system directly on the 
> devices /dev/sdb /dev/sdd etc.., there are no Persistent Reservations 
> being established on my storage array. If use LVM2 to create logical 
> volumes and build my FS on top of them, I see the persistent 
> reservations being established.

The scsi_reserve script looks for clvm volumes, then discovers the 
devices in those volumes. If you do not have a clvm volume, then you 
won't find any devices and thus you won't see any reservations.

Ryan