Anlegen einer Control Group
- cgcreate -g blkio:/mygroup
Checken
- lscgroup | grep blkio:/mygroup
blkio:/mygroup
Welche Parameter sind Subsystem Block-I/O vorhanden
/mygroup:
blkio.throttle.io_serviced: Total 0
blkio.io_service_bytes_recursive: Total 0
blkio.io_serviced_recursive: Total 0
blkio.time:
blkio.io_serviced: Total 0
blkio.reset_stats:
blkio.io_wait_time: Total 0
blkio.weight: 500
blkio.leaf_weight_device:
blkio.throttle.read_iops_device:
blkio.io_merged_recursive: Total 0
blkio.throttle.write_bps_device:
blkio.leaf_weight: 500
blkio.sectors_recursive:
blkio.weight_device:
blkio.io_service_time_recursive: Total 0
blkio.throttle.write_iops_device:
blkio.throttle.io_service_bytes: Total 0
blkio.io_service_bytes: Total 0
blkio.io_wait_time_recursive: Total 0
blkio.io_service_time: Total 0
blkio.time_recursive:
blkio.io_merged: Total 0
blkio.throttle.read_bps_device:
blkio.sectors:
blkio.io_queued: Total 0
blkio.io_queued_recursive: Total 0
Zustand der Drosselung checken
- cgget -g blkio /mygroup | grep blkio.throttle.write_bps_device
blkio.throttle.write_bps_device:
Feststellen der Major und Minor Nummer
brw-rw---- 1 root disk 8, 0 Okt 12 22:24 /dev/sda
Geschwindigkeit einschränken
- echo "8:0 1048576" > /sys/fs/cgroup/blkio/mygroup/blkio.throttle.write_bps_device
Erneutes checken
- cgget -g blkio /mygroup | grep blkio.throttle.write_bps_device
blkio.throttle.write_bps_device: 8:0 1048576
Ohne Einschränkung
- dd if=/dev/zero of=nix bs=4k count=10240 conv=fdatasync
10240+0 Datensätze ein
10240+0 Datensätze aus
41943040 bytes (42 MB, 40 MiB) copied, 0,848822 s, 49,4 MB/s
Mit Einschränkung
- cgexec -g blkio:/mygroup cp /tmp/100M /root/