dm-ioband

Overview

dm-ioband is an I/O bandwidth controller implemented as a device-mapper driver and can control bandwidth on per partition, per user, per process , per virtual machine (such as KVM or Xen) basis. If you use dm-ioband with blkio-cgroup (described below), you can also control bandwidth on per cgroup basis.

dm-ioband distributes bandwidth to each group (group is determined by partition, user ID, process ID and so on) according to bandwidth control policies. Currently, dm-ioband supports three kinds of policies:

weight policy

This policy distributes bandwidth proportional to the weight of each group and charges to each group on an I/O count basis. If there are some groups that are inactive, other active groups can use the spare bandwidth of those inactive groups.

weight-iosize policy

Same as "weight" policy, but it charges on an I/O size basis.

range-bw policy

range-bw means the predicable I/O bandwidth with minimum and maximum value defined by administrator. And it is also possible to set up only maximum value for only I/O limitation. So, you can define the specific and fixed bandwidth to satisfy I/O requirement regardless of whole I/O bandwidth.

Download

Kernel patch files

Binary packages for RHEL5.x and CentOS 5.x

RPM binary packages are for Red Hat Enterprise Linux 5.x and CentOS 5.x. They were tested on RHEL 5.3 and CentOS 5.3 and will also work on other 5.x versions.

dm-ioband-config package

The dm-ioband-config package provides a configuration file and an init script to make it easy to assign bandwidth to LVM logical volumes.

Documentation

Online manual

• What's dm-ioband all about?
• Setup and installation
• Command reference
• Configuration Examples
• Easy setup for LVM logical volumes by using dm-ioband-config package

Benchmark results

• Benchmarks in a variety of configurations
  • Bandwidth control on...
    • a per partition basis (1)
    • a per partition basis (2)
    • a per partition basis (3)
    • a per user basis
    • a per logical volume basis (LVM)
    • a per Xen virtual block device basis
    • a per Xen blktap process basis
• Benchmarks with a high performance storage system

Test Report

dm-ioband Test Report (Required OpenOffice? Calc)

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