Why not want to use Round Robin now (vSphere)?
Given a configuration of storage fibre channel with more than one of THEM in each server (and more than one switch in the fabric) and what VMWare calls a table "active/passive" (where a single SP both "owns" a logic unit number), I saw messages in the last (see links at the bottom of this message) explaining how over time MRU can cause all of your traffic to fibre channel end on
a single switch/HBA.
So I wonder now because it is supported in vSphere, why I would want to use round robin for a table where vSphere uses by default a path MRU policy? What's the downside for RR? Is it safe (according to the docs RR is smart enough to only use 'active' paths in an active-passive array, but that is the case)? Everybody use it now? Alternatives that involve manually the balancing/re-balancing active links?
These are positions that made me question initially MRU:
http://virtualgeek.typepad.com/virtual_geek/2009/04/understanding-MRU-behavior-in-VMware-ESX-3x.html
Thanks in advance.
Hello
If you have only 2 HBA ports on your host and they are active/passive then alternating really does not benefit anyone. If you have more than 2 ports and more than 1 port zoned on the active storage processor or your San is active/active then alternating would work fine.
Best regards, Edward L. Haletky VMware communities user moderator, VMware vExpert 2009
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