Specifications

IP Mirroring
130 Continuous Access Storage Appliance Installation and Maintenance Guide
Processing synchronous IP mirroring requests
This section describes how the appliance software processes synchronous IP mirroring
requests. It describes the following topics:
■ Synchronous IP mirroring process
■ IP mirroring performance
Synchronous IP mirroring process
Processing synchronous IP mirroring requests involves the following steps (Figure 28):
1. The host sends a request to the local LUN.
2. An IP mirroring worker thread receives the request on the local LUN and sends it to a
network thread on the remote LUN.
3. The worker thread completes the request on the local LUN.
4. A worker thread completes the request on the remote LUN.
5. The local LUN waits for a successful response from the remote LUN.
6. The worker thread on the remote LUN sends a successful response to the worker thread on
the local LUN.
7. The worker thread on the local LUN receives the response from the remote LUN.
8. The local LUN sends a response to the host indicating that the request is complete.
Figure 28: Processing a synchronous IP mirroring request