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Hi </div>
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5.0.2 with a hotfix for a lz4 compression bug </div>
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Bob</div>
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<strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:rgb(0,111,201); font-size:10pt">Bob Cregan</span></strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt"><br>
HPC Systems Analyst</span><span style="font-family:Calibri,sans-serif,serif,EmojiFont; color:black"></span></p>
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<span style="font-size:10pt"></span><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">Information & Communication Technologies</span><span style="font-family:Calibri,sans-serif,serif,EmojiFont; color:black"></span></p>
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<span style="font-size:10pt"></span><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">Imperial College London, </span><br>
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<span style="font-size:10pt">T: 07712388129</span><br>
<span style="font-size:10pt">E: b.cregan@imperial.ac.uk</span><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> on behalf of Luis Bolinches <luis.bolinches@fi.ibm.com><br>
<b>Sent:</b> 28 November 2019 13:00<br>
<b>To:</b> gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject:</b> Re: [gpfsug-discuss] Compression question</font>
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Which version are you running?
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<div>I was involved on a big for compressed file sets and snapshots that were related to what you see. <br>
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<div>Cheers</div>
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<blockquote type="cite">On 28. Nov 2019, at 14.57, Cregan, Bob <b.cregan@imperial.ac.uk> wrote:<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hi </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Sounds logical - except the snap metadata does not have the compression flag set. So if the inode now points to a set of compressed blocks how does the client know to decompress it?</div>
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After compression of an existing file we get in the snap</div>
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<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">-bash-4.2$ mmlsattr -L .snapshots/@GMT-2019.11.27-19.30.14/UserGuide_13.06.pdf</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">file name:<span>
</span>.snapshots/@GMT-2019.11.27-19.30.14/UserGuide_13.06.pdf</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">metadata replication: 2 max 2</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">data replication:
<span> </span>1 max 3</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">immutable:<span>
</span>no</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">appendOnly:
<span> </span>no</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">flags:
<span> </span></span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">storage pool name:<span>
</span>sata1</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">fileset name:
<span> </span>userdirs</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">snapshot name:<span>
</span>@GMT-2019.11.27-19.30.14</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">creation time:<span>
</span>Tue Mar<span> </span>5 16:16:40 2019</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">Misc attributes:<span>
</span>ARCHIVE</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">Encrypted:<span>
</span>no</span></p>
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and the original file is definitely compressed.</div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">-bash-4.2$ mmlsattr -L UserGuide_13.06.pdf<span> </span></span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">file name:<span>
</span>UserGuide_13.06.pdf</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">metadata replication: 2 max 2</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">data replication:
<span> </span>1 max 3</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">immutable:<span>
</span>no</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">appendOnly:
<span> </span>no</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">flags:
<span> </span></span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">storage pool name:<span>
</span>sata1</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">fileset name:
<span> </span>userdirs</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">snapshot name:
<span> </span></span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">creation time:<span>
</span>Tue Mar<span> </span>5 16:16:40 2019</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">Misc attributes:<span>
</span>ARCHIVE COMPRESSION (library z)</span></p>
<p style="margin:0px; font:11px Menlo; margin:0px"><span style="font-variant-ligatures:no-common-ligatures; font-variant-ligatures:no-common-ligatures">Encrypted:<span>
</span>no</span></p>
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Bob</div>
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<strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:rgb(0,111,201); font-size:10pt">Bob Cregan</span></strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt"><br>
HPC Systems Analyst</span><span style="font-family:Calibri,sans-serif,serif,EmojiFont; color:black"></span></p>
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<span style="font-size:10pt"></span><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">Information & Communication Technologies</span><span style="font-family:Calibri,sans-serif,serif,EmojiFont; color:black"></span></p>
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<span style="font-size:10pt"></span><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">Imperial College London, </span><br>
<span style="font-size:10pt">South Kensington Campus London, SW7 2AZ</span><br>
<span style="font-size:10pt">T: 07712388129</span><br>
<span style="font-size:10pt">E: b.cregan@imperial.ac.uk</span><br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org> on behalf of Daniel Kidger <daniel.kidger@uk.ibm.com><br>
<b>Sent:</b> 28 November 2019 12:30<br>
<b>To:</b> gpfsug-discuss@spectrumscale.org <gpfsug-discuss@spectrumscale.org><br>
<b>Cc:</b> gpfsug-discuss@spectrumscale.org <gpfsug-discuss@spectrumscale.org><br>
<b>Subject:</b> Re: [gpfsug-discuss] Compression question</font>
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<p class="x_x_MsoNormal" style="margin:0cm 0cm 0pt"><span style="font-size:12pt; font-family:"Arial",sans-serif"><font size="2"><font color="#ff0000">Caution
</font><font color="#000000">- This email from daniel.kidger@uk.ibm.com originated outside Imperial
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<div dir="ltr">Alexander,</div>
<div dir="ltr"> </div>
<div dir="ltr">Can you then confirm then that the inodes in the snapshot will now point to fewer but compressed blocks ?</div>
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<span style="font-size:1.000em">Daniel</span></div>
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----- Original message -----<br>
From: "Alexander Wolf" <A.Wolf-Reber@de.ibm.com><br>
Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>
To: gpfsug-discuss@spectrumscale.org<br>
Cc:<br>
Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>
Date: Thu, Nov 28, 2019 12:21<br>
<div dir="ltr" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt">
<div dir="ltr">I just tested this. Compressing a file did free up space in the file system. Looks like our compression code does not trigger COW on the snapshot. You can test this yourself by looking into mmlssnapshot -d (please not on a large production fs,
this command is expensive).</div>
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----- Original message -----<br>
From: "Luis Bolinches" <luis.bolinches@fi.ibm.com><br>
Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>
To: gpfsug-discuss@spectrumscale.org<br>
Cc: gpfsug-discuss@spectrumscale.org<br>
Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>
Date: Thu, Nov 28, 2019 11:47<br>
<div dir="ltr" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt">
<div dir="ltr">Hi</div>
<div dir="ltr"> </div>
<div dir="ltr">Same principle COW. The data blocks do not get modified.</div>
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<span style="font-size:10pt"><font face="Arial">--<br>
Ystävällisin terveisin / Kind regards / Saludos cordiales / Salutations</font> / Salutacions<br>
<font face="Arial">Luis Bolinches</font></span></div>
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----- Original message -----<br>
From: "Cregan, Bob" <b.cregan@imperial.ac.uk><br>
Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
Cc:<br>
Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>
Date: Thu, Nov 28, 2019 12:06 PM<br>
<br>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Just to clarify this is SS compression, so </div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
mmchattr --compression yes <filename></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
or an ILM equivalent</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
So not a regular modification.</div>
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</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Bob</div>
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<strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:rgb(0,111,201); font-size:10pt">Bob Cregan</span></strong><br>
<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">HPC Systems Analyst</span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">Information & Communication Technologies</span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">Imperial College London, </span><br>
<span style="font-size:10pt">South Kensington Campus London, SW7 2AZ</span><br>
<span style="font-size:10pt">T: 07712388129</span><br>
<span style="font-size:10pt">E: b.cregan@imperial.ac.uk</span></span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">W: </span><a href="http://www.imperial.ac.uk/ict/rcs" id="LPNoLP" rel="noopener noreferrer" target="_blank"><span style="font-size:10pt">www.imperial.ac.uk/</span><span style="font-size:10pt">ict</span><span style="font-size:10pt">/</span><span style="font-size:10pt">rcs</span></a></span></p>
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<div dir="ltr" id="x_x_divRplyFwdMsg"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> Cregan, Bob<br>
<b>Sent:</b> 28 November 2019 09:43<br>
<b>To:</b> gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject:</b> Compression question</font>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hi All,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Can someone answer the following question on compression in a snapshot context? We have tried various experiments and they are inconclusive - too tedious to go into the detail.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
What happens to the snapshot when a file is compressed in SS? The logic as I see it is </div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
</div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
####### In a non compressed situation ###############</div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
</div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
1) create a file,</div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
2) create a snapshot.</div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
3) modify a file in a normal way - the blocks on disk are changed and the old blocks are then written to the snap. </div>
<div style="margin:0px; font-size:12pt; font-family:Calibri,Arial,Helvetica,sans-serif; color:black; background-color:rgb(255,255,255)">
</div>
<div style="margin:0px; font-size:15px; color:rgb(32,31,30); background-color:rgb(255,255,255)">
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<p style="margin-top:0px; margin-bottom:0px">######In a compressed situation ############</p>
<p style="margin-top:0px; margin-bottom:0px"> </p>
<div style="margin:0px">
<div style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif">1) create a file,</div>
<div style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif">2) create a snapshot.</div>
<div style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif">3) Compress the file. Now IBM says the blocks are rewritten when the file is compressed. So do the old uncompressed blocks go into the snap? If so we now have 2 copies of the file and unless
the compression > 50% we have used more space until the snap is deleted.</div>
<div style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif"> </div>
<div style="margin:0px; font-family:Calibri,Arial,Helvetica,sans-serif">You get the space back in the end, but if you are in a tight situation then potentially compression might not work for you in the short term.</div>
</div>
</div>
</div>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Thanks</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Bob</div>
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<strong><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:rgb(0,111,201); font-size:10pt">Bob Cregan</span></strong><br>
<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">HPC Systems Analyst</span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt">Information & Communication Technologies</span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">Imperial College London, </span><br>
<span style="font-size:10pt">South Kensington Campus London, SW7 2AZ</span><br>
<span style="font-size:10pt">T: 07712388129</span><br>
<span style="font-size:10pt">E: b.cregan@imperial.ac.uk</span></span></p>
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<span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black"><span style="font-size:10pt">W: </span><a href="http://www.imperial.ac.uk/ict/rcs" id="LPNoLP" rel="noopener noreferrer" target="_blank"><span style="font-size:10pt">www.imperial.ac.uk/</span><span style="font-size:10pt">ict</span><span style="font-size:10pt">/</span><span style="font-size:10pt">rcs</span></a></span></p>
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<sub><span style="font-size:10pt; line-height:23px; font-family:Calibri,sans-serif,serif,EmojiFont; color:rgb(31,73,125)"></p>
<div><Image.ba38b5d6-12d6-476a-bcd8-7d647bfab5b3.png></div>
</span></sub><span style="font-size:10pt; line-height:23px; font-family:Arial,sans-serif,serif,EmojiFont; color:black">@imperialRCS @imperialRSE</span>
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