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| Understanding business needs | ||
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| Prev | Before you begin configuring | Next |
To satisfy the needs of your business, you must consider the following:
The amount of data that can be lost if a disaster occurs and yet continue the business successfully
The amount of time acceptable to recover the data after the disaster and continue the business successfully
In a traditional tape backup scheme, the amount of data lost in a disaster can be large, depending on the frequency of backup and tape vaulting. Also, the recovery time from a tape backup can be significant. In a VVR environment, recovery time is negligible and the amount of data lost depends on the following factors:
Mode of replication
Network bandwidth
Network latency between the Primary and the Secondary
Ability of the Secondary data volumes to keep up with the write rate
If the data on the Secondary must be as up to date as possible, we recommend that you use synchronous mode and provide the same bandwidth as the peak rate at which the application writes on the Primary. However, if the Secondary can be allowed to lag behind, we recommend that you use asynchronous mode and provide the same bandwidth as the average rate at which the application writes on the Primary. These decisions are determined by your business needs.