If you want to minimize the impact on users,
High Performance mode (which is asynchronous) might be a better choice.
??? Low system downtime: If user experience isn??™t a factor, you should always run database
mirroring in High Availability mode. When database mirroring has a witness
instance and is running in synchronous mode, failover is extremely fast, no matter
what the distance. If the users are using SNAC, the failover will be nearly seamless.
??? Uptime first, data second: If you??™re concerned with uptime at the expense of data
loss, then High Performance mode is the most likely choice. While failover requires
manual intervention, it??™s extremely fast. Also, it uses asynchronous communication,
so there will be no direct impact on the user experience.
??? Data first, uptime second: Sometimes the most important factor in a data system is
the protection of that data. Any lost data could mean a loss not only in revenue but
also in terms of customers (and thus, future revenue). Imagine an online retailer:
would it be better to lose 20 minutes??™ worth of data or have 20 minutes of downtime?
I would choose the downtime.
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