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ALUA is not supported

Publication Date:  2017-04-06 Views:  150 Downloads:  0
Issue Description

OS host : windows server 2012 R2

Storage : OceanStor 5500 V3 (V300R500)

 

customer enable ALUA in the storage, after customer mapped the host with the LUN.

but, MPIO display not support ALUA.

Alarm Information

from device manager (storage), there is no error information.

from the host (OS), there is information regarding, ALUA not supported.

Handling Process

collect information from customer first, how customer configure the ALUA.

as customer information, customer enable ALUA, after mapped the host with LUN.

so, from this information, we can try reboot the host (OS) or enable ALUA before host mapped to the LUN. and collect storage log, to check there is alarm from the storage or not.

 

Root Cause

the root cause :

by default, ALUA is disabled.

MPIO can not be refreshed automatically, to show that ALUA is supported in windows host.

it need reboot the host OS, then when MPIO scan the disk path, ALUA is supported information will be updated. (in this case, if the host already mapped with the LUN)


Solution

solution :

1. before mapped host with the LUN, please enable the ALUA in the host.

2. if host already mapped with LUN, we need reboot the windows host.

END