ZFSisms that are not true, or no longer true

[Arwen]

@HoneyBadger

@Arwen

Can the discussion of L2ARC move to another thread?

I’m happy to start up another one to discuss it in more detail.

I have started a L2ARC Resource page:

L2ARC tuning guide and common misconceptions

We have had lively discussions of ZFS’ L2ARC, as L2ARC has both changed over the years, and Here are common misconceptions: Size should be about 5 times RAM and no more than 10 times RAM. This is no longer true. L2ARC should not be added until RAM is maxed out. While more RAM is better / faster, using L2ARC on even 16GB RAM configurations is practical. These are current recommendations:

Everyone please take the L2ARC discussions to that page.