<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" >Hi</div>
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<div dir="ltr" >On top of what has been mentioned here (RAID <-> BS aligment, and many other things) I would suggest to look at the last 4/5 slides of a 2018 (disclaimer: my own) London UG presentation <a href="http://files.gpfsug.org/presentations/2018/London/14_LuisBolinches_GPFSUG.pdf" >http://files.gpfsug.org/presentations/2018/London/14_LuisBolinches_GPFSUG.pdf</a></div>
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<div dir="ltr" >It gives a start on different storage subsystems and full stripe write and those things that do not matter, ... until they do.</div>
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<div dir="ltr" >But I agree that on top of whatever that Protect process was doing there might be ways of improvement here. Enjoy the ride.</div>
<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><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 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> / <font face="Arial" >Salutacions</font><br><font face="Arial" >Luis Bolinches</font></span></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: "Valdis Klētnieks" <valdis.kletnieks@vt.edu><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] Client Latency and High NSD Server Load Average<br>Date: Sat, Jun 6, 2020 08:38<br>
<div><font size="2" face="Default Monospace,Courier New,Courier,monospace" >On Fri, 05 Jun 2020 14:24:27 -0000, "Saula, Oluwasijibomi" said:<br><br>> But with the RAID 6 writing costs Vladis explained, it now makes sense why the write IO was badly affected...<br><br>> Action [1,2,3,4,A] : The only valid responses are characters from this set: [1, 2, 3, 4, A]<br>> Action [1,2,3,4,A] : The only valid responses are characters from this set: [1, 2, 3, 4, A]<br>> Action [1,2,3,4,A] : The only valid responses are characters from this set: [1, 2, 3, 4, A]<br>> Action [1,2,3,4,A] : The only valid responses are characters from this set: [1, 2, 3, 4, A]<br><br>And a read-modify-write on each one.. Ouch.<br><br>Stuff like that is why making sure program output goes to /var or other local file<br>system is usually a good thing.<br><br>I seem to remember us getting bit by a similar misbehavior in TSM, but I don't<br>know the details because I was busier with GPFS and LTFS/EE than TSM. Though I<br>have to wonder how TSM could be a decades-old product and still have<br>misbehaviors in basic things like failed reads on input prompts...</font><br> </div>
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