Home > Storage > ObjectScale and ECS > Product Documentation > Dell ECS: GeoDrive Best Practices > Multi-site sync
Multi-site sync allows multiple GeoDrive servers to reference the same ECS data. Using this feature minimizes the amount of time that peer GeoDrive servers spend out-of-sync. By enabling multi-site sync, peer GeoDrive servers are notified when a file create or modify operation is completed by one of its peer servers.
This is shown in Figure 5. When a file is created on one GeoDrive server and after it is uploaded to ECS, peer GeoDrive servers are notified and a directory sync operation occurs on peer servers to recognize the file creation. In this scenario, the file will appear as a stub on peer servers and will be restored to local disk cache when the file is opened for access. When an existing file is modified or updated, the GeoDrive server that initiated the modification notifies its peers after the upload to ECS has completed, and the peer servers initiate a restore of the file into its local disk cache. The file upload to ECS will be asynchronous unless the synchronous upload option is enabled.