<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:9pt" ><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>
<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div class="socmaildefaultfont" dir="ltr" ><div dir="ltr" style="margin-top: 20px;" ><div style="margin-top: 10px;" ><div style="font-family: sans-serif; font-size: 8pt; margin-bottom: 0.0001pt; line-height: normal;" ><span style="font-size:1.000em;" >Daniel</span></div>
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<div style="margin-bottom: 0.0001pt; line-height: normal;" ><font color="#19A9F3" size="3" style="font-family: "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 8pt; outline: none;" >_________________________________________________________</font><br style="outline: none;" ><font color="#808080" face="Arial" size="2" ><span style="caret-color: rgb(18, 18, 18);" ><b>Daniel Kidger</b></span></font></div>
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<div dir="ltr" > </div>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- 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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<div dir="ltr" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" ><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2" ><font face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" size="2" ><font face="Arial" size="2" >Mit freundlichen Grüßen / Kind regards</font> </font> </font>
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<div dir="ltr" > </div>
<div dir="ltr" > </div>
<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- 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>
<div dir="ltr" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" ><div style="font-size: 12pt; font-weight: bold; font-family: sans-serif; color: #7C7C5F;" ><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>
<div style="font-size: 12pt; font-weight: bold; font-family: sans-serif; color: #7C7C5F;" ><span style="font-size:10pt;" ><font face="Arial" >Consultant IT Specialist</font><br><font face="Arial" >Mobile Phone: +358503112585</font><br><a href="https://www.youracclaim.com/user/luis-bolinches" rel="noopener" target="_blank"><b><font face="Arial" >https://www.youracclaim.com/user/luis-bolinches</font></b></a><br><br><b><font color="#7C7C5F" face="Arial" >"If you always give you will always have" -- Anonymous</font></b></span></div>
<div style="font-size: 8pt; font-family: sans-serif; margin-top: 10px;" ><div> </div></div></div></div></div></div></div></div></div>
<div dir="ltr" > </div>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- 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><!--Notes ACF
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<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>
<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);" >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>
<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>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" > </div>
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<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt" >Information & Communication Technologies</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33); line-height:24px" ><sub><span style="font-size:10pt; line-height:23px; font-family:Calibri,sans-serif,serif,EmojiFont; color:rgb(31,73,125)" ><img alt="1505984389175_twitter.png" data-outlook-trace="F:1|T:1" src="cid:f7e9a6a7-c4ab-4a2c-a979-4513774aa054" style="" > </span></sub><span style="font-size:10pt; line-height:23px; font-family:Arial,sans-serif,serif,EmojiFont; color:black" >@imperialRCS @imperialRSE</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><img alt="1505983882959_Imperial-RCS.png" data-outlook-trace="F:1|T:1" src="cid:dbd2fd87-b9f2-4b15-903f-c74c7b7298d3" style="" ></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33); line-height:24px" > </p>
<p style="margin-top: 0px; margin-bottom: 0px;" > </p>
<p style="margin-top: 0px; margin-bottom: 0px;" > </p></div></div>
<div id="appendonsend" > </div>
<hr style="display:inline-block;width:98%" tabindex="-1" ><div dir="ltr" id="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>
<div> </div></div>
<div dir="ltr" ><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)" ><div dir="ltr" style="margin:0px; font-size:12pt; font-family:Calibri,Helvetica,sans-serif,Helvetica,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; color:black" ><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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<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><span style="font-family:Arial,sans-serif,serif,EmojiFont; color:black; font-size:10pt" >Information & Communication Technologies</span></p>
<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><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>
<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33); line-height:24px" ><sub><span style="font-size:10pt; line-height:23px; font-family:Calibri,sans-serif,serif,EmojiFont; color:rgb(31,73,125)" ><img alt="1505984389175_twitter.png" data-outlook-trace="F:2|T:2" src="cid:ba38b5d6-12d6-476a-bcd8-7d647bfab5b3" style="" > </span></sub><span style="font-size:10pt; line-height:23px; font-family:Arial,sans-serif,serif,EmojiFont; color:black" >@imperialRCS @imperialRSE</span></p>
<p style="margin-top:0px; margin-bottom:0px; margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:"Times New Roman",serif; color:rgb(33,33,33)" ><img alt="1505983882959_Imperial-RCS.png" data-outlook-trace="F:2|T:2" src="cid:e34493c2-d35b-4fff-a6df-ce87e2ae5ed4" style="" ></p>
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