tar do make backups of a machine. But, it is using a lot of I/O and slows down the whole machine.
So, is there a way to limit the read speed of
I know about
pv, but it limit only the write speed. Because I do incremental backups with
tar --listed-incremental, this will work only with the first full backup (subsequent incremental backups will then consume a lot of read I/O if there is only small changes).
I've tried to lower the overall priority of the backup with a combination of
ionice, but this not really change anything.
Informations: it's Debian 9 machine, and the files are residing on an ext4 file-system on top of a LVM volume.