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XtraBackup - slave behind master

HTF1HTF1 ContributorInactive User Role Beginner

I'm trying to create another slave so I run the following command on the slave server:

innobackupex --user=root --password=password --slave-info /backup/</pre>

- however the XtraBackup cause that slave is going behind the master (I've stopped the script when it was 3600s)
The value is especially increasing when it's backing up database directories (after 'ibdata' files have been copied)

I've checked the IO with 'iostat' and MB_read/s was ~20.

I've also tried with --throttle=10 but still the same.

Is there any way to prevent this?

I'm using the latest version of XtraBackup. The system is running on KVM with two separate LVM partitions as a disks.

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