Improving ZFS performance for large directories

[Daniel Kalchev]

On 25.02.13 19:00, Kevin Day wrote:
> I've been hesitating to increase the arc size because we've only got 64GB of memory here and I can't add any further. The processes running on the system themselves need a fair chunk of ram, so I'm trying to figure out how we can either upgrade this motherboard to something newer or reduce our memory size. I've got a feeling I'm going to need to do this, but since this is a non-commercial project it's kinda hard to spend that much money on it. :)

Just make vfs.zfs.arc_meta_limit as big as arc_max. This is safe. By 
default it is 25% of arc_max I believe. In your case, you are better 
caching more metadata than file data anyway.

Daniel