Constant Transfer Rate RAID striping for QoS

**NEW** Read news article on QoS RAID and LZVS at HardwareTech.info
This work has also been cited by Jim Tripp in his article on configuring and benchmarking RAID

Abstract:

Currently the performance observed by users of disks is affected greatly by where the data is placed on that disk. Towards the outside of the disk there are a greater number of sectors that pass under the head quickly, so higher throughput is observed, than on the inside of the disk. For applications such as random access streaming media servers better load balancing is needed.

I propose a level of RAID striping that enforces a constant disk transfer rate to achieve near to average performance across the entire logical disk.

Download paper as:

GZipped PostScript (600kb)
PostScript (1.5mb)
PDF (200kb)

Download the Linux 2.4 series kernel patch and utilities:

!!! I'm deciding whether or not to release this free... For now the links to code are dead... !!!

qosraid.tar.gz

Other Resources:

The LL_TRACE driver developed as part of the QoS RAID project

Owain Lloyd - January 2002