RBD mirroring to DR site

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I'm considering doing one-way rbd mirroring to a DR site. The documentation states that my link to the DR site should have sufficient throughput to support replication.

Our write activity is bursty. As such, we tend to see moments of high throughput 4-6gbps followed by long bouts of basically no activity.

1) how sensitive is rbd mirroring to latency?
2) how sensitive is rbd mirroring to falling behind on replication and having to catch up?
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