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28 Posts
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892
March 24th, 2014 04:00
Quire on FSN & LCAP
Hi,
We have a new VNXe 3150 with 2X1 GB I/O modules. Going to connect 4 physical severs (for CIFS) to storage through switch.
FCN will provide port level redundancy and LACP will allow multiple ports into single logical port and will provide load balance across linked ports and redundant ports.
My quire is can which one I can configure here either FSN / LACP ??
Thanks in advance.
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DynaDin
138 Posts
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March 24th, 2014 05:00
Both FSN and LACP provide port level redundancy. However, LACP has load balancing in addition. You can refer to VNXe High Availablitiy document for more examples.
White Paper: VNXe High Availability VNXe3100, VNXe3150, and VNXe3300 Overview
Yes, in the above example, all three are in same SP.
Subnet I think come in upper layer which switches dont care. If you are thinking about vLAN, they should be configured allow multiple vLAN traffic if SPA and SPB are in different vLAN.
Even if both SPs are in put in differnet subnets, network connectivity should be configured such that, if IP addresses (CIFS/NFS/iSCSI server IP address) on one SP fails over to peer SP, hosts/users should be able to connect to it.
DynaDin
138 Posts
1
March 24th, 2014 04:00
FSN is in-built mechanism which you cannot control or configure. It is enabled by default.
FSN provides redundancy of ports across SPs. For example, eth2 of SPA and SPB are part of one FSN pair. If eth2 on SPA fails, traffic will be redirected internally through eth2 of SPB.
LACP will provide redundancy among 'link aggregated' ports within same SP. For example, if eth10, eth11 and eth12 are part of aggregation, and if eth10 fails, then eth11 & eth12 will continue to support connectivity. This works untill all three ports fail.
In the event all three aggregated ports on SPA fail, then FSN will pitch-in as usual. That means traffic to these three ports will be re-directed through SPB's eth10, eth11 and eth12 ports. That's why it is important to have identical network configuration for SPA and SPB.
Gopi Reddy
28 Posts
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March 24th, 2014 05:00
Thank you Dinesh for your post,
In which case FSN / LACP does it benefit a customer or an environment??
In the above example Eth10, eth11, eth12 is from same SP ?? and Two switches need to be on same subnet or different subnet ??