Oracle Linux : Device-Mapper-Multipath Shows "Kernel: sd 2:0:0:12: emc: ALUA failover mode detected" (Doc ID 2214249.1)

Last updated on DECEMBER 15, 2016

Applies to:

Linux OS - Version Oracle Linux 5.8 with Unbreakable Enterprise Kernel [2.6.32] and later
Linux x86-64

Symptoms

The ALUA is Asymmetric Logical Unit Access. It allows you to access a LUN via the non-owning Storage Processor in an Active-Passive array. Below the path_checker emc_clarion detects ALUA but emc_clarion is optimized for PNR ( Passive Not Ready )

Cause

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