Rsync drops from 80 Meg/sec to 3-10 Meg/sec
From laptop to external USB 3.0, 2 TB Western Digital
$ rsync -avP --stats -h /media/Laptop01/ /media/USB3/Backup01
When I want to do a snapshot, it bottlenecks...
$ rsync -avP --stats -h --link-dest=/media/USB3/Backup01/ /media/Laptop01/ /media/USB3/Snapshot01/
-forcing each of the (3) rsync processes to individual cpus
-disabling legacy usb
-temporary disalbe acpi /sys/firmware/acpi/interrupts...
I noticed the disk is stuck with 100 % usage;
$ iostat -xd 2
I've read tons of others with this problem, no solution has worked for me so far.
Might anyone have an idea for a solution ?