Hello,
I'm looking for comments on monitoring swap usage on ndbd nodes. I've
got two NDBD nodes that have 16GB of RAM. 10GB are dedicated to
DataMemory and 2GB to IndexMemory. I've got lockpagesinmainmemory set.
That leaves about 4GB left to the OS of RAM plus another 4GB of swap.
In our managed hosting, we monitor swap usage and send alarms on certain
usage thresholds. For this one ndbd node, all the swap gets used up at
some point but still plenty of RAM left and system perfectly stable.
Should we even then bother with monitoring the swap usage? Turn it off
completely for ndbd nodes? Lower the vm.swappiness?
Thanks,
Matthew
