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  3. August 2016

RE: Explanation of NFS and other similar features/tools

It is the AIX version of the NFS server. I've not experienced the same
issues as Aaron, however I'll guess the culprit is the IFS itself. There
are some architectural roadblocks that keep the IFS from being as fast as a
file system on a Unix server, which might explain the performance
implications.

--
Jim Oberholtzer
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Aaron
Bartell
Sent: Thursday, August 04, 2016 8:06 AM
To: Midrange Systems Technical Discussion
Subject: Re: Explanation of NFS and other similar features/tools

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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