It was morning and got page stating one of our site is having trouble after some maintenance work and as usual i have to be on my toes to get it fixed and avoid time delay and resume plant functioning.
what has happen was they lost both SC controllers and luns and vdisk were not showing, Management controller was down.
(OK for those who are new in infrastructure for them.
Every Storage has 2 storage controller and 2 management controllers.
Storage controller also referred as SC and Management controllers are referred as MC.)
the one MC which was alive was showing following information :) which was next to Null.
Mantra for such situation is dont panic and first thing you should do is take store logs.
(store logs is your storage logs and gives detail information, you have to open report in notepad++ )
in our case it was clear that none of storage controller were alive.
You should 1st start with power down all host if they were on, shutdown your storage, Remove power cables lets it get power down,
Re seat your controller and power on again.
There are higher chances your Storage come backs until no hardware failure.
Remember-
Store Logs, Power off and deep breath is must.
Last but not least don't panic and don't loose patience.
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