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List:       gpfsug-discuss
Subject:    Re: [gpfsug-discuss] Compatibility question
From:       "Steven Daniels" <sadaniel () us ! ibm ! com>
Date:       2019-11-22 17:01:09
Message-ID: OFE09CAEC5.B9B5B0A2-ON872584BA.005AEC92-872584BA.005D7D76 () notes ! na ! collabserv ! com
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Felipe,

You are correct. The code is restricted to 4.2.2 or higher. If there is an 
ESS storage cluster in the environment then the recommendation I was told 
is 4.2.3.7 or higher.

Luke,

If your clients are in the same cluster then you need to be careful with 
the setting to minReleaseLevel, Exactly as it sounds, it will restrict 
membership to this level or higher. 

I have a client running with filesystem version 3.5.0.7 in several 
clusters.

We just recently upgraded their ESS systems to the current release so I 
can verify that the file system format will carry fine. 

If you have ESS at 5.3.3 or higher, then the GNR recommendation is 4.2.3.7 
or higher for the clients (my client can't go to v5 due to the RHEL 
version requirement) and they must be in a remote cluster.

In my case we upgraded an ESS storage cluster to 4.1.1 to 5.0.3.3 (ESS 
v5.3.4.1)  and for GNR we had to update this cluster to LATEST for 
minReleaseLevel which is 5.0.3. 

The client cluster is running 4.2.3.18 which is as Felipe says is N-1 and 
minReleaseLevel is set to 4.2.3.7

This client cluster also mounts from another storage cluster  which is 
constrained to run at 4.1.1-8. This makes the client cluster at N+1 from 
its relationship with this cluster.

All three clusters have minReleaseLevel set to LATEST (4.1.0, 
4.2.3.7,5.0.3 , respectively).

These changes would not work in a single cluster as all nodes would be 
restricted to the 4.1.0 or higher and the ESS would not be able to 
co-exist since it requires the 5.0 level.

We have updated the file systems in the 4.1.1-8 cluster from 3.5.0.7 to 
4.1.1 and we updated the ESS filesystems from 3.5.0.7 to 5.0.3 (compat 
mode)

The changes all went well.

Hopefully this helps you understand the nuance that is whether the clients 
and NSDs are in a single cluster or different clusters. The rules are 
slightly but importantly different.

Also, when updating the filesystem versions make sure you use the "compat" 
flag if you have any remote clusters. If we would have run this with the 
"full" flag on the ESS storage cluster, it would have prevented the 
4.2.3.18 client cluster  from mounting its file systems.

thanks,
Steve


Steven A. Daniels
Cross-brand Client Architect
Senior Certified IT Specialist
National Programs
Fax and Voice: 3038101229
sadaniel@us.ibm.com
http://www.ibm.com




From:   "Felipe Knop" <knop@us.ibm.com>
To:     gpfsug-discuss@spectrumscale.org
Cc:     gpfsug-discuss@spectrumscale.org
Date:   11/21/2019 09:49 PM
Subject:        [EXTERNAL] Re: [gpfsug-discuss] Compatibility question
Sent by:        gpfsug-discuss-bounces@spectrumscale.org



George,
 
Coexistence either in the same cluster or across remote clusters is only 
supported with versions "N" and "N-1". 5.0.3 and 3.5 are "N" and "N-3", 
and this is not supported. If I recall, there is even logic in place that 
will prevent 5.x nodes from accepting connections from nodes running below 
4.2 .
 
  Felipe
 
----
Felipe Knop knop@us.ibm.com
GPFS Development and Security
IBM Systems
IBM Building 008
2455 South Rd, Poughkeepsie, NY 12601
(845) 433-9314 T/L 293-9314
 
 
 
----- Original message -----
From: Luke Raimbach <luke.raimbach@googlemail.com>
Sent by: gpfsug-discuss-bounces@spectrumscale.org
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>
Cc:
Subject: [EXTERNAL] Re: [gpfsug-discuss] Compatibility question
Date: Thu, Nov 21, 2019 8:12 PM
 
That would make my eyes water and maybe fall out. Yours might too of you 
try it. 
 
Be very careful with v3 upgrades, especially going up to v5 directly.
 
You will certainly run into RPC incompatibility problems with the v3 and 
v5 nodes running concurrently. Staying within the supported envelope of 
"one major version" difference will ease the raising of support tickets 
with IBM if you run into problems.
 
Why can't you upgrade the clients?
 
On Thu, 21 Nov 2019, 18:24 George Terry, <gterryc@vmsupport.com> wrote:
Hello,

I have a question about compatibility between two different versions. I 
have a cluster with 6 gpfs nodes. 2 of them are NSD servers the other 4 
are clientes nodes. I will upgrade the NSD servers from 3.5.0 to 5.0.3. 
Due to application's  issues I cannot update the client nodes. So, my 
question is, can i have a cluster with client nodes with 3.5.0.7 version 
and the NSD nodes in 5.0.3 version with de filesystem in 3.5.0.7 (13.23) 
version?

Thanks for the support. 
 
George
_______________________________________________
gpfsug-discuss mailing list
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<span style=" font-size:10pt;font-family:sans-serif">Felipe,</span><br><br><span \
style=" font-size:10pt;font-family:sans-serif">You are correct. The code is \
restricted to 4.2.2 or higher. If there is an ESS storage cluster in the environment \
then the recommendation I was told is 4.2.3.7 or higher.</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">Luke,</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">If your clients are in the same cluster then \
you need to be careful with the setting to minReleaseLevel, Exactly as it sounds, it \
will restrict membership to this level or higher. </span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">I have a client running with filesystem \
version 3.5.0.7 in several clusters.</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">We just recently upgraded their ESS systems to \
the current release so I can verify that the file system format will carry fine. \
</span><br><br><span style=" font-size:10pt;font-family:sans-serif">If you have ESS \
at 5.3.3 or higher, then the GNR recommendation is 4.2.3.7 or higher for the clients \
(my client can't go to v5 due to the RHEL version requirement) and they must be in a \
remote cluster.</span><br><br><span style=" font-size:10pt;font-family:sans-serif">In \
my case we upgraded an ESS storage cluster to 4.1.1 to 5.0.3.3 (ESS v5.3.4.1) \
&nbsp;and for GNR we had to update this cluster to LATEST for minReleaseLevel which
is 5.0.3. </span><br><br><span style=" font-size:10pt;font-family:sans-serif">The \
client cluster is running 4.2.3.18 which is as Felipe says is N-1 and minReleaseLevel
is set to 4.2.3.7</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">This client cluster also mounts from another \
storage cluster &nbsp;which is constrained to run at 4.1.1-8. This makes the client \
cluster at N+1 from its relationship with this cluster.</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">All three clusters have minReleaseLevel set to \
LATEST (4.1.0, 4.2.3.7,5.0.3 , respectively).</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">These changes would not work in a single \
cluster as all nodes would be restricted to the 4.1.0 or higher and the ESS would not \
be able to co-exist since it requires the 5.0 level.</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">We have updated the file systems in the \
4.1.1-8 cluster from 3.5.0.7 to 4.1.1 and we updated the ESS filesystems from 3.5.0.7 \
to 5.0.3 (compat mode)</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">The changes all went well.</span><br><br><span \
style=" font-size:10pt;font-family:sans-serif">Hopefully this helps you understand \
the nuance that is whether the clients and NSDs are in a single cluster or different \
clusters. The rules are slightly but importantly different.</span><br><br><span \
style=" font-size:10pt;font-family:sans-serif">Also, when updating the filesystem \
versions make sure you use the &quot;compat&quot; flag if you have any remote \
clusters. If we would have run this with the &quot;full&quot; flag on the ESS storage \
cluster, it would have prevented the 4.2.3.18 client cluster &nbsp;from mounting its \
file systems.</span><br><br><span style=" \
font-size:10pt;font-family:sans-serif">thanks,</span><br><span style=" \
font-size:10pt;font-family:sans-serif">Steve</span><br><br><br><span style=" \
font-size:10pt;font-family:Arial">Steven A. Daniels</span><br><span style=" \
font-size:10pt;font-family:Arial">Cross-brand Client Architect</span><br><span \
style=" font-size:10pt;font-family:Arial">Senior Certified IT \
Specialist</span><br><span style=" font-size:10pt;font-family:Arial">National \
Programs</span><br><span style=" font-size:10pt;font-family:Arial">Fax and Voice: \
3038101229</span><br><a href="mailto:sadaniel@us.ibm.com"><span style=" \
font-size:10pt;color:blue;font-family:Arial"><u>sadaniel@us.ibm.com</u></span></a><br><a \
href="http://www.ibm.com/"><span style=" \
font-size:10pt;color:blue;font-family:Arial"><u>http://www.ibm.com</u></span></a><br><img \
src=cid:_2_10815644108153D8005D7CF1872584BA style="border:0px \
solid;"><br><br><br><br><span style=" \
font-size:9pt;color:#5f5f5f;font-family:sans-serif">From: &nbsp; &nbsp; &nbsp; \
&nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">&quot;Felipe \
Knop&quot; &lt;knop@us.ibm.com&gt;</span><br><span style=" \
font-size:9pt;color:#5f5f5f;font-family:sans-serif">To: &nbsp; &nbsp; &nbsp; \
&nbsp;</span><span style=" \
font-size:9pt;font-family:sans-serif">gpfsug-discuss@spectrumscale.org</span><br><span \
style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc: &nbsp; &nbsp; &nbsp; \
&nbsp;</span><span style=" \
font-size:9pt;font-family:sans-serif">gpfsug-discuss@spectrumscale.org</span><br><span \
style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date: &nbsp; &nbsp; \
&nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">11/21/2019 \
09:49 PM</span><br><span style=" \
font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject: &nbsp; &nbsp; &nbsp; \
                &nbsp;</span><span style=" \
                font-size:9pt;font-family:sans-serif">[EXTERNAL]
Re: [gpfsug-discuss] Compatibility question</span><br><span style=" \
                font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" \
font-size:9pt;font-family:sans-serif">gpfsug-discuss-bounces@spectrumscale.org</span><br><hr \
noshade><br><br><br><span style=" \
font-size:10pt;font-family:Arial">George,</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">Coexistence either in the same cluster or across \
remote clusters is only supported with versions &quot;N&quot; and &quot;N-1&quot;. \
5.0.3 and 3.5 are &quot;N&quot; and &quot;N-3&quot;, and this is not supported. If I \
recall, there is even logic in place that will prevent 5.x nodes from accepting \
connections from nodes running below 4.2 .</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp; Felipe</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">----<br>Felipe Knop knop@us.ibm.com<br>GPFS \
Development and Security<br>IBM Systems<br>IBM Building 008<br>2455 South Rd, \
Poughkeepsie, NY 12601<br>(845) 433-9314 T/L 293-9314<br> </span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
                font-size:10pt;font-family:Arial">----- Original message
-----<br>From: Luke Raimbach &lt;luke.raimbach@googlemail.com&gt;<br>Sent by: \
gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug main discussion list \
&lt;gpfsug-discuss@spectrumscale.org&gt;<br>Cc:<br>Subject: [EXTERNAL] Re: \
[gpfsug-discuss] Compatibility question<br>Date: Thu, Nov 21, 2019 8:12 PM<br> \
&nbsp;</span><br><span style=" font-size:10pt;font-family:Arial">That would make my \
eyes water and maybe fall out. Yours might too of you try it. </span><br><span \
style=" font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">Be very careful with v3 upgrades, especially going \
up to v5 directly.</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">You will certainly run into RPC incompatibility \
problems with the v3 and v5 nodes running concurrently. Staying within the supported \
envelope of &quot;one major version&quot; difference will ease the raising of support \
tickets with IBM if you run into problems.</span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">Why can't you upgrade the clients?</span><br><span \
style=" font-size:10pt;font-family:Arial">&nbsp; </span><br><span style=" \
font-size:10pt;font-family:Arial">On Thu, 21 Nov 2019, 18:24 George Terry, \
&lt;</span><a href="mailto:gterryc@vmsupport.com" target="_blank"><span style=" \
font-size:10pt;color:blue;font-family:Arial"><u>gterryc@vmsupport.com</u></span></a><span \
style=" font-size:10pt;font-family:Arial">&gt; wrote:</span><br><span style=" \
font-size:10pt;font-family:Arial">Hello,<br><br>I have a question about compatibility \
between two different versions. I have a cluster with 6 gpfs nodes. 2 of them are NSD \
servers the other 4 are clientes nodes. I will upgrade the NSD servers from 3.5.0 to \
5.0.3. &nbsp;Due to application's &nbsp;issues I cannot update the client nodes.
So, my question is, can i have a cluster with client nodes with 3.5.0.7
version and the NSD nodes in 5.0.3 version with de filesystem in 3.5.0.7
(13.23) version?<br><br>Thanks for the support. </span><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><span style=" \
font-size:10pt;font-family:Arial">George</span><p \
style="margin-top:0px;margin-Bottom:0px"><span style=" \
font-size:10pt;font-family:Arial">_______________________________________________<br>gpfsug-discuss \
mailing list<br>gpfsug-discuss at </span><a href="http://spectrumscale.org" \
target="_blank"><span style=" \
font-size:10pt;color:blue;font-family:Arial"><u>spectrumscale.org</u></span></a><span \
style=" font-size:10pt;color:blue;font-family:Arial"><u><br></u></span><a \
href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank"><span \
style=" font-size:10pt;color:blue;font-family:Arial"><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></span></a></p><br><tt><span \
style=" font-size:10pt">_______________________________________________<br>gpfsug-discuss \
mailing list<br>gpfsug-discuss at spectrumscale.org</span></tt><tt><span style=" \
font-size:10pt;color:blue"><u><br></u></span></tt><a \
href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank"><tt><span \
style=" font-size:10pt;color:blue"><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></span></tt></a><tt><span \
style=" font-size:10pt"></span></tt><br><span style=" \
font-size:10pt;font-family:Arial">&nbsp;</span><br><tt><span style=" \
font-size:10pt">_______________________________________________<br>gpfsug-discuss \
mailing list<br>gpfsug-discuss at spectrumscale.org<br></span></tt><a \
href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss"><tt><span style=" \
font-size:10pt">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</span></tt></a><tt><span \
                style=" font-size:10pt"><br></span></tt><br><br><BR>
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