2.2.40 Boot from SAN installation fails using multipath on Pure Storage FlashArray

Systems installed with Oracle Linux 6 update 9 and configured to use the UEK R4 kernel fail to boot if the boot disk is a multipath LUN on a Pure Storage FlashArray. The system boots successfully if the LUN is exposed on a single path, or if the system is installed using Oracle Linux 6 update 8. The system is also able to boot successfully if configured to use the RHCK.

The exact cause of the issue is currently under investigation, but was replicated using a Pure Storage FlashArray FA-420 Pure Array and a QLogic QLE2562 HBA. (Bug IDs 26732037, 27093062).