Block IO limits

The goal of the project is to add the block IO usage accounting to the existing racct/rctl infrastructure. I want to make it possible for the system administrator to limit the block IO throughput for a particular process, user or a jail to for example 1MB per second read access.

• block IO throughput limit for write access
• block IO throughput limit for read access

• Rudo Tomori
• Edward Tomasz Napierała - mentor

The following patch is work in progress

• FreeBSD-CURRENT http://www.ms.mff.cuni.cz/~tomor6am/racct-io/racct_io_current_r248247.patch

cd /usr/src
patch -p1 < patch-file.patch

options RACCT
options RCTL

rctl -a user:tom:ior:deny=1M Adds a 1MB/sec IO limit for user tom for block IO read access.

rctl -a process:1657:iow:deny=1M Adds a 1MB/sec IO limit for process with id 1657 for block IO write access.

• Hierarchical_Resource_Limits