An administrator in configuring an ESXi host with two dual port FC adapter. The FC storage has four FC controllers Using Round Robin.
How many paths are used at any given time ?
A.
0
B.
1
C.
2
D.
3
E.
4
F.
5
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Why would this not be E?
0
0
Hi,
From my understanding, it is correct. Please see if this is clear.
IF Host is configured with 2 Ports – There will be 2 paths
IF Host is configurd with 2 dual ports- ie one port can have 2 paths and totally 4 paths.
Since Round Robin is used, Host will mark one active paths from both the ports to implement load balancing in case of failure.
This is just my understanding..may be someone else can give more explanation…
0
0
Thanks.
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0
IMO the answer should be B. At any given time only one path will be used. With round robin, ESX will start at the first active path and send 1000 IOPS, then move to the next active path and send 1000 IOPS and so on.
See links below
http://www.sandfordit.com/vwiki/index.php/Configuration_Considerations_%28ESX%29
http://virtualgeek.typepad.com/virtual_geek/2010/03/understanding-more-about-nmp-rr-and-iooperationslimit1.html
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To answer this we’d need to know how many datastores are being served by the SAN. If there is only one datastore then only one path would be used at a time. If there are 2 datastores then 2 would be used at any one time.
Once again poor wording:
FC storage controllers do not use Round Robin, vsphere multipathing uses Round Robin.
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