How to enable read-only LUNs after disk replication split without rebooting the RHEL server?

Solution Verified - Updated -

Issue

EMC SRDF is being used for asynchronous disk replication between two sites. On the standby site the SAN is read-only but after splitting the disks (disabling replication), the SAN disks are made writable to the host. However, the server is still seeing them as read-only. Only after rebooting the node is when the server sees them as writable. Rebooting is not acceptable in this situation as there are other workloads already running on this system that should not be interrupted.

Is is a way to 'refresh' the read-only status on the LUNs without rebooting?

Environment

  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 6
  • EMC SRDF disk replication

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