Calculating Bandwidth; Inter-Site Bandwidth Based On The Number Of Storage Systems At A Site - HP storevirtual 3200 User Manual

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Table Of Contents

Table of Contents

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Single subnet—Hewlett Packard Enterprise recommends using a single subnet.

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Adequate bandwidth between sites—Plan for the appropriate amount of bandwidth for each storage

system between sites. For instance if each site contains one StoreVirtual 3200 storage system, then you

need at least 100 MB/sec throughput between sites.

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Low round-trip latency—To avoid impacting disk I/O to the application server, the round-trip latency

between the sites must be no more than 2 ms.

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Redundant links—Maintain multiple physical connections (media) between the sites for redundancy.

Configure the network so that a link failure does not prevent communication between sites.

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Assign servers to sites—Avoid high-latency connections by assigning application servers to the site

where the server is located. Application servers assigned to a site connect with iSCSI sessions only to

storage systems in the same site when the storage in that site is available.

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Use the Failover Manager—Unless you have storage systems in three physical sites, use a Failover

Manager. Put the Failover Manager on a third logical site:

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On a network that is isolated from the other sites.

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Use a different power connection.

NOTE:

The minimum requirement for the Failover Manager is 100 Mbps with 50 ms latency.