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.
from device manager (storage), there is no error information.
from the host (OS), there is information regarding, ALUA not supported.
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.
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)
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.