[OpenIndiana-discuss] Should I see a major slowdown when rsyncing to zfs nfs share

[Jacob Ritorto]

is it mounted with noatime?  Updating access time for every file being read
over nfs sometimes results in massive slowdown.  An nfs rsync of millions
of tiny files would exhibit this pathology.

On Fri, Jan 2, 2015 at 10:48 PM, Harry Putnam <reader at newsguy.com> wrote:

> Server setup: oi build 151_a9
> zfs filesystem with nfs and root rw enabled on share.
>
> zfs get sharenfs p0/rrsnap/gv
> NAME          PROPERTY  VALUE                                    SOURCE
> p0/rrsnap/gv  sharenfs  rw=@192.168.0.0/24,root=@192.168.0.0/24
> inherited from p0/rrsnap
>
> -------       -------       ---=---       -------       -------
>
> client setup: Gentoo linux
> Linux gv 3.18.0-gentoo #3 SMP Sun Dec 14 13:29:08 EST 2014 i686
> The linux client is running as vbox guest on OI b 151_a9 HOST
> -------       -------       ---=---       -------       -------
>
> The rsync (in the form of an rsnapshot backup script) is being run on
> the Gentoo Linux OS and writing to the zfs share shown above.
>
> I see a major slowdown, maybe even a massive slowdown when writing to
> the nfs mounted share when compared to writing to an on client-HOST
> disc.
>
> It's running now, and so I can't give the completion time yet but I'm
> pretty sure it will be 4-5 times slower, so roughly 450 percent
> slower.
>
> Oh, and the amount of data being written is 1.3 GB
>
> I'll have both exact times at some point up ahead. I didn't think to
> time the on client-host run.  I wasn't planning on changing to
> writting to an nfs share, but I can tell by watching the crawling
> output that it is orders of magnitude slower.
>
> I'm pretty sure it would be faster over ssh but haven't tried that
> yet.
>
> Is this really abnormal?  Can any of you give some idea what I should
> be expecting here?
>
>
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