On 3/4/2022 7:21 AM, Les Mikesell wrote:
Unix/Linux has something calle 'sparse' files used by some types of databases where you can seek far into a file and write without using/allocating any space up to that point. The file as stored may not be large but most tools to copy it will act as though the empty parts were filled with nulls. Rsync might handle them these days but may still take the time to send the stream of nulls. But in any case they are rarely used on Windows.
rsync over the network should use compression. If you're doing it inside ssh, then use ssh's compression, which is more reliable. The run of nulls will be compressed down to a count and one null. Their transfer will be almost instantaneous.
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