Sadek, Abdel napisał(a): > Is there a document that clearly explains the difference between SCSI 2 > reserve/release and SCSI 3 persistent reservation? > Google->"SCSI-2 SCSI-3 persistent reservation" fe. [1] > My understanding of the SCSI reservation in a Cluster environment is > that one node Only can reserve a LUN for write access. No. For SCSI-3 PR only one node can reserve device but alle registrant could have access to write - it depends also which mode for PROUT type You set(fe. write exclusive - registrants only) [2] > > In my 2 node RHEL 4.5 cluster I’ve noticed that both nodes are > registered with my LUNs from my SAN storage array. Only one of them > holds the reservation but both can access it for Read/Writes. It is ok. For SCSI-3 PR all nodes could do registration, but only one could have reservation. [1] - http://blogs.sun.com/kristien/entry/scsi_reservations_in_sun_cluster [2] - http://t10.org/ftp/t10/document.03/03-230r1.pdf Best Regards Maciej Bogucki -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
