James Smart wrote:
Uh, although this may work very well for small constrained configs, as one
who debugs larger environments (and things always grow or get connected in
ways you don't expect), depending on a random number for uniqueness makes
me very unsettled. Debugging that small-percentage potential, when/if it
does occur can be an absolute nightmare with all kinds of weird behavior.
Rarely will you solve it from the context of a single server. There are
lots of ways to cheat, but I believe they all have to be based on some
small part that is guaranteed to be unique (like the IEEE id's).
That's the ideal world, sure :)
But the reality is, just like with ethernet MAC addresses, you don't
always have one when you "supposed to" have one.
There are obvious limitations and problems arising from a generated WWN
-- particularly for an HBA, where serial numbers and other unique
identifiers are scarce. But that doesn't wish the missing-WWN problem
away. Decades of networking experience have taught us a few things :)
As an aside, we also need a way to override the HBA's WWN, just like we
do with ethernet MAC address.
Jeff
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