Add wake-on-lan so that a sleeping node could be used when more transcodering power is required.

[nydave69]

Add wake-on-lan so that a sleeping node could be used when more
transcodering power is required.

The command to WOL is;

wakeonlan -i 192.168.44.255 00:0e:c4:d4:d1:c6

command (-i interface) mac address of the node
The interface is determined by using the broadcast address of the sleeping node
and the mac address of the sleeping node. Would be nice to gather when setting
up the node as a slave and storing with its IP address.

if I issue the command from a terminal it takes about 5 seconds for the node to wake and
become stable.

Sleeping nodes just need to be setup, I set mine to watch port 22 for inactivity
and to wait 10 minutes before going to sleep, other settings maybe needed depending
on performance, they are set on each slave independently.

When to send the WOL command?
Processing power of the current active nodes is greater the 80%, not sure what
numbers should be used, something testing will tell.
But the power savings when not in use will be the biggest benefit as a node would
only power up when needed. Add sleep as transcoderings complete.

[nydave69]

managed to get most of it working.. only thing I haven't figured out yet is what is returned by load in the load balancing section. I would like to set a threshold like say 80%, if the current loads exceed that value another slave is awaken. From what I can figure out three values are returned.. If I run prt get_cluster_load the returned values don't seem to reflect what is happening on the slaves.

[Troubadoure]

Would love to see how you managed to configure this

[liviynz]

The usage comes from the load average which isn’t an exact point in time value but over a short period of time so if the slave was busy just before it still sees some of that value. There’s good reasons to be using that over a point in time value however it does need a bit of a rework to take other items into consideration. I do have an enhancement on my list around his usage is calculated and allowing for profiling so certain slaves are given preference over others even if they’re busier, only using certain slaves for certain types of transcoding, etc.

[nydave69]

Since there wasn't any movement on this project and Plex versions have jumped way ahead. I've dropped working with this here.