Fibre Port Flags Init_Point_to_Point(PP) & Unique_WWN(UWN)

Question

Hi, Can somebody explain about the significance of the Fibre Port Flags Init_Point_to_Point(PP) & Unique_WWN(UWN) on a Symm array? What are these flags used for? Thanks in advance.

rawstorage · Accepted Answer

Joseph,

I asked around about this it seems that if you set don't set this then the default WWN that is set on the fa board form the manufacturer will be presented. If you have it set then the WWN will be the EMC WWN which ties to the serial of the box.

This is pretty much always set.

Paul

rawstorage · Answer

Unique_WWN

When enabled (default) for all environment configuration changes and new environments to

ensure unique World Wide Names (WWN) within the fibre environment (uses Symmetrix serial

numbers and port numbers). When disabled, you don’t have to change WWNs.

Init_Point_to_Point

When enabled, specifies a point-to-point (direct or switched) topology in the initialization

sequence. When disabled (default), it is initialized as an arbitrated loop.

joseph82 · Answer

Hi Paul,

Thanks for the info. Would be great if you can explain bit more about the description given for Unique_WWN.

"When disabled, you don’t have to change WWNs." - Change WWNs??? From where? And how do you do it?

Symmetrix

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