Refer to the exhibit.
Correct Answer: A
Explanation/Reference:
Explanation:
Best practices
Use a single IP subnet with Layer 2 switching
Configure redundant network paths between sites to help minimize link failure in a two-site configuration. In multi-site cluster with three sites, HP recommends a triangle network design, not a V-design to ensure high availability.
For 1GbE installations allocate 50 MB/s per storage node in the sites between data centers; for environments with 10GbE storage connectivity, reserve 250 MB/s. For campus cluster deployments with Fibre Channel connectivity on HP StoreVirtual, plan for 500 MB/s per storage node in the sites (only two sites supported).
In the example (see Figure 7) above with 1GbE storage connectivity and two storage nodes in each site, designate 50 MB/s x 2 = 100 MB/s of bandwidth between the sites (at least one 1GbE link; two for redundancy).
HP StoreVirtual Fail-over Manager is not in the data path and has to be connected using at least Fast Ethernet (100 Mb/s) with a latency not exceeding 50 ms.
Network latency
High network latency can be the primary cause of slow I/O performance, or worse, iSCSI target disconnects. It is important to keep round trip network latency on your storage subnet below two milliseconds. Many factors can contribute to increasing network latency, but two are most common:
Distance between storage cluster nodes
Router hops between storage cluster nodes
Configuring a multi-site cluster on a single IP subnet with Layer 2 switching will help to lower the network latency between storage cluster nodes.