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

[Jacob Ritorto]

oops, you're Writing to the share, not reading from it; pls disregard and
sorry for the misread.

On Fri, Jan 2, 2015 at 11:10 PM, Jacob Ritorto <jacob.ritorto at gmail.com>
wrote:

> 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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>>
>
>