From your link: "When mounting over the local file system..."

Well, I'll be a monkey's uncle. So my use case *is* valid. I've not
tested NFS from one LPAR to another, though I'd expect that to be slower
and wouldn't have done the same use case (mapped a dir for the purposes of
running binaries and loading libxxx[.a|.so] files).



Aaron Bartell
litmis.com - Services for open source on IBM i


On Thu, Aug 4, 2016 at 10:48 AM, Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>
wrote:

:) I don't think one can conclude this - NFS is defined in several RFCs.
On the IBM i, the server is implemented by the QNFSNFSD job, client by the
QNFSBIOD - those are just separate jobs that can run at the same time.

I just read this in a nice KB article from IBM at
http://www-01.ibm.com/support/docview.wss?uid=nas8N1016376 (IBM NFS
Concepts and Troubleshooting). Seems a good starting point, so that we
don't have to make guesses.

If you do see a performance problem locally that you don't see when using
NFS between a couple IBM i LPARs or between the IBM i and a Linux box, then
a PMR is in order.

HTH
Vern


On 8/4/2016 10:25 AM, Aaron Bartell wrote:

Thanks for that, Charles. The end point I'll make is NFS wasn't created
with local mounts in mind**. Linux mount was created with both in mind.

**If it was, then there needs to be some performance tweaks applied to
defaults for it to be viable(opinion).

Aaron Bartell
litmis.com - Services for open source on IBM i


On Thu, Aug 4, 2016 at 10:12 AM, Charles Wilt <charles.wilt@xxxxxxxxx>
wrote:

I'd disagree...


On both IBM i and Linnux, MOUNT is used to mount both local and remote
file
systems.

Linux mount supports both NFS and SMB as protocols for remote file
systems.

IBM i mount supports just NFS. SMB support is provided by the QNTC file
system.

So the difference you saw wasn't IBM i vs Linux mount, but local vs
remote.

Charles

On Thu, Aug 4, 2016 at 11:00 AM, Aaron Bartell <aaronbartell@xxxxxxxxx>
wrote:

One more question - are you talking about the IBM i as an NFS client or

as

an NFS server?

The IBM i was playing both in my scenario. An NFS definition was
created
outside of chroot, and the mount destination/mapping was created inside
chroot. I dug a little into the Linux mount(n1) command and see it

doesn't

focus on the 'N' of NFS (specifically, network). That would be my
guess
for why NFS is so slow in my scenario. IBM i's NFS would be like Linux
mount+samba.

n1 - http://linux.die.net/man/8/mount

Aaron Bartell
litmis.com - Services for open source on IBM i


On Thu, Aug 4, 2016 at 9:53 AM, Vernon Hamberg <
vhamberg@xxxxxxxxxxxxxxx

wrote:

Aaron

One more question - are you talking about the IBM i as an NFS client or

as

an NFS server?

Thanks
Vern


On 8/4/2016 8:06 AM, Aaron Bartell wrote:

I'd love to expand on it if I was knowledgeable about it, but I am

not. I

only have results of a single scenario that caused it to not work for

our

needs. I'd love to learn that the speed can be addressed, but I don't
have
the time (currently) to dig into it and have instead resorted to less
expensive means (buying disk vs. cpu).

It's entirely possible that IBM's under-the-covers implementation is
similar to Linux and it's simply the IFS being slow (and consuming

mass

CPU
in the process) that's the issue.

Aaron Bartell
litmis.com - Services for open source on IBM i


On Thu, Aug 4, 2016 at 8:00 AM, Charles Wilt <charles.wilt@xxxxxxxxx>
wrote:

Aaron,

Care to expand on that? What's different?

I was under the impression that the IBM i's NFS was the same as
Linux/Unix
NFS.

Charles


On Thu, Aug 4, 2016 at 8:48 AM, Aaron Bartell <

aaronbartell@xxxxxxxxx>

wrote:

Drawbacks: It's a little more setup. And learning the options of

EXPORTFS and MOUNT is a curve.

One more drawback that caused me to stop using them in significant
fashion... NFS is CPU intensive when used in an IFS I/O heavy

scenario

(i.e. mapping Node.js runtime). I don't have a full understanding

of

how
NFS works under the covers but suffice to say I learned to not put

it

in

a

similar camp of the Linux "mount" command (which is how I was using

it,

right or wrong).

Aaron Bartell
litmis.com - Services for open source on IBM i


On Thu, Aug 4, 2016 at 7:28 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

There are two parts to NFS. The client, and the server.

If you're familiar with QNTC then you are aware that you can do a

WRKLNK
'/QNTC/mypcserver/mypcshare' and look at shares on various PC's.

This

would be a client.
You can also create a 'share' using IBM i Navigator that PC's can

access.
This would be a server.

Both QNTC and shares are comparable, but different, than NFS.
There are issues with QNTC that make some people tend to shy away

from

it.

You use EXPORTFS (since EXPORT was already used in binder language)

to

serve up a directory.
You use MOUNT from an IBM i client to consume what some server

exported.
Other open systems, and even old proprietary legacy systems like
Windows,
also support NFS as a client and a server.

Drawbacks: It's a little more setup. And learning the options of
EXPORTFS and MOUNT is a curve.
Pros: It works. Unlike QNTC to a system with numerous shares

defined

that are multiple characters long, with many of the shares having

the

first x number of characters identical.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Darryl Freinkel <dhfreinkel@xxxxxxxxx>
To: Midrange Systems Technical Discussion <

midrange-l@xxxxxxxxxxxx

Date: 08/04/2016 08:07 AM
Subject: Explanation of NFS and other similar features/tools
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



I have always seen these but never had a need to use them or so I

thought.

I do not have a need right now.

What and how are these tools intended to be used?

Reading a current thread on the NFS, I got curious. To date I have

simply
used the IFS root extensively.

TIA

Darryl Freinkel
iPad
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