Link Speed If you have to transfer an average replication bundle of 4GB in a

Link speed if you have to transfer an average

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Link Speed If you have to transfer an average replication bundle of 4GB in a one hour period, you must examine the link speed to determine if the RPO can be met. If you have a 10Mb link, under ideal conditions on a completely dedicated link with Ĵ overhead, 4GB takes about an hour to transfer. Meeting the RPO saturates a 10Mb WAN connection. The connection is saturated even under ideal conditions, with no overhead or limiting factors such as retransmits, shared Ĝ ǰ or excessive bursts of data change rates. You can assume that only about 70% of a link is available for Ĝ replication. This means that on a 10Mb link you obtain a link speed of about 3GB per hour. On a 100Mb link you obtain a speed of about 30GB per hour. To calculate the bandwidth, see “Calculate Bandwidth for vSphere Replication,” on page 29. Calculate Bandwidth for vSphere Replication To determine the bandwidth that vSphere Replication requires to replicate virtual machines Ĝ ¢ǰ you calculate the average data change rate within an RPO period divided by the link speed. If you have groups of virtual machines that have ě RPO periods, you can determine the replication time for each group of virtual machines. For example, you might have four groups with RPO of 15 minutes, one hour, four hours, and 24 hours. Factor in all the ě RPOs in the environment, the subset of virtual machines in your environment that is replicated, the change rate of the data within that subset, the amount of data changes within each ę RPO, and the link speeds in your network. Prerequisites Examine how data change rate, Ĝ rates, and the link speed meet the RPO. Then look at the aggregate of each group. Procedure 1 Identify the average data change rate within the RPO by calculating the average change rate over a longer period then dividing it by the RPO. 2 Calculate how much Ĝ this data change rate generates in each RPO period. Chapter 3 vSphere Replication System Requirements VMware, Inc. 29
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3 Measure the Ĝ against your link speed. For example, a data change rate of 100GB requires approximately 200 hours to replicate on a T1 network, 30 hours to replicate on a 10Mbps network, 3 hours on a 100Mbps network. VMware vSphere Replication Administration 30 VMware, Inc.
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Installing and Uninstalling vSphere Replication 4 vSphere Replication uses the replication technologies included in ESXi with the assistance of virtual appliances to replicate virtual machines between source and target sites. Installing vSphere Replication To use vSphere Replication, you must deploy the vSphere Replication appliance on an ESXi host by using the vSphere Web Client. The vSphere Replication appliance registers as an extension with the corresponding vCenter Server instance. For example, on the source site, the vSphere Replication appliance registers with the vCenter Server instance on the source site. Only one vSphere Replication appliance is allowed per vCenter Server.
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