Re: generating a Linux WWN?

[James Smart <James.Smart@Emulex.Com>]

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).

-- james s

Jeff Garzik wrote:
> Is there an accepted way to generate a SAS address, when the adapter 
> does not supply one (NVRAM invalid or missing, etc.)?
> 
> Unless somebody complains, I was just planning to use 
> get_random_bytes().  But maybe Linux has an IEEE id we can use, to make 
> the practice a bit more legitimate and avoid stomping on others?  Or an 
> IEEE id specifically designed for generated-address purposes?
> 
>     Jeff
> 
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>