zfs, a directory that used to hold lot of files and listing pause

[Miroslav Lachman]

Eugene M. Zheganin wrote on 2016/10/20 15:47:
> Hi.
>
> I have FreeBSD 10.2-STABLE r289293 (but I have observed this situation
> on different releases) and a zfs. I also have one directory that used to
> have a lot of (tens of thousands) files. I surely takes a lot of time to
> get a listing of it. But now I have 2 files and a couple of dozens
> directories in it (I sorted files into directories). Surprisingly,
> there's still a lag between "ls" and an output:

[...]

> I've seen this situation before, on other servers, so it's not the first
> time I encounter this. However, it's not 100% reproducible (I mean, if I
> fill the directory with dozens of thousands of files, I will not
> certainly get this lag after the deletion).

What about snapshots? Are there any snapshots on this filesystem?

Or scrub running in the background?

Miroslav Lachman