Description of problem: For RHEL 5.5, 2-node clusters support fencing with SCSI reservations. As Perry Myers noted in an email exchange: As customers they do have access to our kbase, and the relevant information is in this public customer facing kbase article: https://access.redhat.com/kb/docs/DOC-17809 which states: "The fence_scsi agent can be used with 2-node clusters only in Red Hat Enterprise Linux 5.4.z and later." The Cluster Administration manual and the Configuration Example: Fence Devices manual need to be updated to note this support. They currently note that for SCSI, as for all SAN fencing agents, the SCSI fencing agent can't be used in a two node cluster. This is not correct.
The RHEL 6 version of the Cluster Administration manual no longer notes that fence_scsi can't be used with 2-node clusters. This bug is a RHEL 5 bug, however -- the next revision of the Configuration Example for Fence Devices will remove this restriction as well. So this bug is still open, but I wanted to note here that the issue has been fixed for RHEL 6.
I have added this note about 2-node support (as of RHEL 5.5 and fully-updated releases of RHEL 5.4) to the working draft of the Configuration Example document. This will be in the RHEL 5.6 release.
Since RHEL 5.6 is long out the door with this fix in place, I am closing this bug.