Sometimes you don't want to utilize disk too heavy.

My case was not to alert monitoring on disk i/o trigger (and yes, this is a workaround, in common case you'd probably like to modify alert setting instead). I tried nice, ionice and even systemd-run -p "IOWriteBandwidthMax=/dev/sdX 10M", but got no luck.

Here's a solution with a great pv util:

mysqldump           ... | pv -q --rate-limit 10M > dump.file
mongodump --archive ... | pv -q --rate-limit 10M > dump.file

Also consider using gzip or pigz (which is able to use multiple processing units) to compress resulting output.


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