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How to boot gracefully from SAN after power failure

Posted on 2006-06-24
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Last Modified: 2013-11-15
I have a server that boots from an EMC AX100 storage array.  Both are connected to a UPS.  After a power failure, both the EMC and the server boots at the same time, but the server cannot boot before the SAN has finished booting.  How do I configure the server to wait until the EMC is up to start booting?

Related to the above, when the batter runs down to below a threshold, I want the EMC and the server to both shut down gracefully.  The problem is, if I shut down the EMC first, the server will crash; if I shutdown the server first, I have no way of shutting down the EMC since the server is connected to the UPS and not the EMC.  How do people do this?

Thanks.
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Question by:MutualHedge
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by:ded9
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Duncan Meyers earned 800 total points
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>I want the EMC and the server to both shut down gracefully
The AX100 doesn't need to be shut down gracefully. It has been designed to recover from a crash.

>How do I configure the server to wait until the EMC is up to start booting?
Theres no easy way around this. You may have the option of a long memory test on your server. Other than that, there's ot a whole lot you can do without spending up on products like this one: http://www.apc.com/products/family/index.cfm?id=70 . Its a smart Power distribution unit for racks - but it may do what you need - it allows for staged power-up, although whether the delay will be sufficient, I don't know.


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by:Duncan Meyers
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On further reading on this page: http://www.apc.com/resource/include/techspec_index.cfm?base_sku=AP7900&tab=features

"Power Delays
Allows users to configure the sequence in which power is turned on or off for each outlet. This helps avoid in-rushes at start-up, which can cause overloaded circuits and dropped loads. Sequencing also allows users to predetermine which piece of equipment is turned on first so other equipment dependant on that unit will function properly." (from www.apc.com)

This looks like it may be just the ticket.
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by:MutualHedge
ID: 16980627
Thanks for the answers.  They give me lots of ideas.  I will look into the APC staged power up product.  It's good to know the EMC can handle a power failure.

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by:Duncan Meyers
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Thanks! You've just tipped me over the 300,000 point mark - which makes me a "Wizard"

W00t! :-)
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