Questions to locality and VSAN implementation

Unanswered Question
Jul 22nd, 2008

Locality goal is to reduce hop counts and resultant latency, on same switch is ideal,

If implement VSAN, will VSAN conflict with "On the same switch ideal" ?

which means will VSAN increase hop count in single mds chassis ?

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 3 (2 ratings)
inch Wed, 07/23/2008 - 05:02


I'm guessing you are talking about using inter vsan routing to have an extra hop?

matthewl626 Wed, 07/23/2008 - 08:56

will it ? also, if IVR over FC in mds 9500 family, will this require the IP-Module ? or native port cards can support the config, thanks.

inch Wed, 07/23/2008 - 14:20


So you are talking about IVR? If you are, no there is no extra hop or any extra latency.

If you add more switches into the mix and perhaps some san extension there can be extra latency but this comes down to placing target/storage ports close (1-2 hops away) from your initiators.

I would suggest you do some background reading on storage network design and/or contact your Cisco SE for extra assistance in designing your network.

IVR does not require the IPS module as it is all still done in fibre channel. It does however require an extra license.

tblancha Wed, 07/23/2008 - 08:10

The hardware switching path in the MDS will provide the same speed whether IVR is used or not. Look hard to see if IVR is required as it might not be worth the administrative overhead.

inch Wed, 07/23/2008 - 16:26

Sorry Tim - Didn't notice you had already replied :)


This Discussion



Trending Topics: Storage Networking