do I need to add more links to my 2208XP

Dragomir · ‎06-03-2015

I have B200M3s with only 1240VIC. No additional mezzanine card. So I get 40GB throughput (20 to fab A) (20 to fab b)

but on my 2208XP I only have 2 uplinks going to the FI. So thats 20GB per IOM Tops.

Do I need to add more links between my IOM and FI to get more balance throughput between the blades and FI?

From what I understand, The more NIFs I have, I will have less HIFs per NIF and thus have better balance throughput and less congestion?

So if I increased the NIFs to 4, I will have only 8HIF/4NIF = 2 slots/nif as opposed to what I have currently which is 8HIF/2 = 4 slots/nif?

Walter Dey · ‎06-03-2015

http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c-series_integration/ucsm2-1/b_UCSM2-1_C-Integration/b_UCSM2-1_C-Integration_chapter_01.html

The following table describes maximum configurable vNICs/vHBAs on a VIC adapter based on the number of FEX uplinks:

Table 2 Cisco UCS 6100 Fabric Interconnect
Acknowledged link between FEX and FI	Maximum configurable vNICs/vHBA on a VIC adapter for the VIC adapter 1225, 1225T, 1227, 1227T	Maximum configurable vNICs/vHBA on a VIC adapter for the adapter VIC P81E
1	Not supported	Not supported
2	3	4
4	9	10
8	21	22

Table 3 Cisco UCS 6200 Fabric Interconnect
Acknowledged link between FEX and FI	Maximum configurable vNICs/vHBA on a VIC adapter for the VIC adapter 1225, 1225T, 1227, 1227T	Maximum configurable vNICs/vHBA on a VIC adapter for the VIC adapter P81E
1	12	13
2	27	28
4	57	58
8	117	118

Dragomir · ‎06-03-2015

I am looking at this

http://d2zmdbbm9feqrf.cloudfront.net/2014/usa/pdf/BRKCOM-2003.pdf

it looks like the more NIFs I have, on the 2208XP, if I use all 8 links, then each server slot will have their own NIF?

IF I use 4, then each NIF will be shared between 2 hosts

so would i get better throughput if I use all 8 links on the 2208XP?

Keny Perez · ‎06-08-2015

Your servers will not "fight" for bandwidth anymore so I guess that is a yes...so your IOM wont be a bottleneck for the servers...

Hope that answers your question.

-Kenny