TCP WMEM Fault in Delphix AWS Target

So you thought you were finished configuring your AWS target, eh?  I already posted a previous time on how to address a fault with the RMEM, but now we’re onto the WMEM.  Wait, WM-what?

No, I fear a DBAs work is never over and when it comes to the cloud, our skill set has just expanded from what it was when we worked on-premise!

Our trusty Delphix Admin Console keeps track of settings on all our sources and targets, informing us when the settings aren’t set to what is recommended, so that we’ll be aware of any less than optimal parameters that could effect performance.

As we address latency in cloud environments, network settings become more important.

How WMEM Differs from RMEM

RMEM= receive

WMEM=send

Where RMEM is quite easy to remember as receive settings, we get to thank

 

As root, we’ll add another line to the sysctl.conf file to reflect values other than defaults:

$ echo 'net.ipv4.tcp_wmem= 102404194304 12582912' >> /etc/sysctl.conf

Reload the values into the system:

$ sysctl -p /etc/sysctl.conf

Verify the settings are now active:

$ sysctl -a | grep net.ipv4.tcp_wmem

net.ipv4.tcp_wmem = 10240 4194304 12582912

That’s all there is to it.  Now you can mark the fault as resolved in the Delphix Admin Console.