Question
How much disk space is needed on the source and destination servers for migration?
Answer
Source server
All content, except for databases, is copied directly to the destination server using the rsync utility. Therefore, the amount of free disk space on the source server must be greater than the size of all databases on subscriptions selected for the transfer.
Note: this requirement applies only for transfer between two Plesk servers. Migration from other panels requires that amount of free disk space is the same as the size of all migrated objects.
The Temp directory specified in a new migration (from the target server) is the one used to store the database dumps and temp files at the source server for later migration to the destination server:
Destination server
The amount of free disk space on the destination server must be greater, than the total size of subscriptions selected for the transfer. Go to Tools & Settings > Summary Report and select Full Report to see the full size of all subscriptions on the server.
It is recommended to add 5-10G on top of the estimated size of the data. This way, either server will have enough free disk space for other operations.
Example
Three subscriptions are selected for the transfer:
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domain1.test has a size of 10G. Among those are two databases - 1.5G and 0.5G in size.
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domain2.test has a size of 3G. No databases exist on this subscription.
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domain3.test has a size of 12G. Two databases - 2.5G and 1.5G in size - exist on this subscription.
In this case, the source server must have 16G of free disk space (size of all databases + 10G) and the destination server must have 35G of free disk space (size of all subscriptions + 10G).