ZFS performance help sought

[Mason Loring Bliss]

On Thu, Jan 21, 2016 at 11:48:16PM -0500, Michael B. Eichorn wrote:

> freebsd.org/doc/en_US.ISO8859-1/books/handbook/zfs-advanced.html

Hm. I don't know that I've looked at this before. Thank you. I'll read it.


> I suppose vfs.zfs.top_maxinflight might worth a try?

Sure. Does it have any correspondence with the qlen iostat -x reports? I
don't know how many levels have queueing, and whether iostat is reading the
drive's tagged command queueing, something in the filesystem, or something
elsewhere in the kernel.

I'll try to figure this out tomorrow, as well as reading the rest of that
page and testing with top_maxinflight. If iostat is reporting something else,
is there a good way to capture current inflight to see how close to the cap
I'm getting in any event?

-- 
 Mason Loring Bliss         mason at blisses.org        http://blisses.org/  
"I am a brother of jackals, and a companion of ostriches."  (Job 30 : 29)