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Resource allocation can be done using '<tt>vzctl set </tt>' command dynamically. The changes can be made persistent by using '<tt>--save</tt>' option with '<tt>vzctl set</tt>' command. The permanent changes are saved in configuration file '<tt>/etc/vz/conf/&lt;container_id&gt;.conf</tt>' file

==I/O priorities for containers==

I/O priorities can be set using:
<pre>
vzctl set <container_id> --ioprio {[0-7]} --save
</pre>
Here, 0 is higher or better than 7. Default I/O priority is 4. (Read http://wiki.openvz.org/I/O_priorities_for_VE for more details).



==Disk space for containers==

Disk space allocated to a container can be set using:
<pre>
vzctl set <container_id> --diskspace <num1>:<num2> --save
</pre>
Example: '<tt>vzctl set 101 --diskspace 6G:7G --save</tt>' to set the space and '<tt>vzctl exec 101 df -h</tt>' to verify the setting.

Just configuring diskspace may not be enough. It is recommended to configure inode limits as well. To configure inode limits use:
<pre>
vzctl set <container_id> --diskinodes <num1>:num2> --save
</pre>

To enable/disable quota for a particular container use:
<pre>
vzctl set <container_id> --diskquota {yes|no} --save
</pre>

Read http://wiki.openvz.org/Disk_quota for more details




=Verify whether current resources allocated to container are enough=

One can verify whether current resources allocated to a container are enough by using:
<pre>
less /proc/user_beancounters
</pre>
The output includes various details like current resource utilization of container, maximum resource utilization for given container, various resource limits etc.  A very important column titled '<tt>failcnt</tt>' indicates number of times a container tried to access a particular resource and was denied due to resource limits.  Now if this number if high for a given parameter for a specific container than it indicates that the container needs more resources of that type for it to function properly.  Thus, /proc/user_beancounters can provide very useful feed-back related to resource allocation (crunch/abundant) for various containers.



Most of the things in this page are learned from http://wiki.openvz.org/Resource_management



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