限制备份速度防止网卡打满

Throttling the throughput to 10MB/sec. This requires the ‘pv’ tools; you can find them at the official site or install it from the distribution package (“apt-get install pv”)

Make a Streaming Backup
https://www.percona.com/doc/percona-xtrabackup/2.4/howtos/recipes_ibkx_stream.html

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