<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Oh? I specifically remember Sven talking about the >32 subblocks on the context of file creation speed in addition to space efficiency. If what you’re saying is true, then why do those charts show that feature in the context of file creation performance and specifically mention it as a performance bottleneck? Are the slides incorrect or am I just reading them wrong?<br><br><div id="AppleMailSignature">Sent from my iPhone</div><div><br>On Nov 30, 2017, at 10:05, Lyle Gayne <<a href="mailto:lgayne@us.ibm.com">lgayne@us.ibm.com</a>> wrote:<br><br></div><blockquote type="cite"><div><p><font size="2">Aaron,</font><br><font size="2">that is a misunderstanding. The new feature for larger numbers of sub-blocks (varying by block size) has nothing to do with the 50K creates per second or many other performance patterns in GPFS.</font><br><br><font size="2">The improved create (and other metadata ops) rates came from identifying and mitigating various locking bottlenecks and optimizing the code paths specifically involved in those ops.</font><br><br><font size="2">Thanks</font><br><font size="2">Lyle</font><br><br><br><graycol.gif><font size="2" color="#424282">Aaron Knister ---11/29/2017 05:42:26 PM---Thanks, Nikhil. Most of that was consistent with my understnading, however I was under the impressio</font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">Aaron Knister <<a href="mailto:aaron.knister@gmail.com">aaron.knister@gmail.com</a>></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">gpfsug main discussion list <<a href="mailto:gpfsug-discuss@spectrumscale.org">gpfsug-discuss@spectrumscale.org</a>></font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">11/29/2017 05:42 PM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">Re: [gpfsug-discuss] Online data migration tool</font><br><font size="2" color="#5F5F5F">Sent by: </font><font size="2"><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org">gpfsug-discuss-bounces@spectrumscale.org</a></font><br></p><hr width="100%" size="2" align="left" noshade="" style="color:#8091A5; "><br><br><br>Thanks, Nikhil. Most of that was consistent with my understnading, however I was under the impression that the >32 subblocks code is required to achieve the touted 50k file creates/second that Sven has talked about a bunch of times:<br><u><font color="#0000FF"><br></font></u><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__files.gpfsug.org_presentations_2017_Manchester_08-5FResearch-5FTopics.pdf&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=4j42dhyLchoL5Popi9kUJDS-YhJpKsnu6defzuSeWOQ&e="><u><font color="#0000FF">http://files.gpfsug.org/presentations/2017/Manchester/08_Research_Topics.pdf</font></u></a><u><font color="#0000FF"><br></font></u><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__files.gpfsug.org_presentations_2017_Ehningen_31-5F-2D-5FSSUG17DE-5F-2D-5FSven-5FOehme-5F-2D-5FNews-5Ffrom-5FResearch.pdf&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=qllKSA1uOdKIh7EJmNXGcwPbJy8JvhZEsImSQv3i-3Q&e="><u><font color="#0000FF">http://files.gpfsug.org/presentations/2017/Ehningen/31_-_SSUG17DE_-_Sven_Oehme_-_News_from_Research.pdf</font></u></a><u><font color="#0000FF"><br></font></u><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__files.gpfsug.org_presentations_2016_SC16_12-5F-2D-5FSven-5FOehme-5FDean-5FHildebrand-5F-2D-5FNews-5Ffrom-5FIBM-5FResearch.pdf&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=sfwCMhUNGjs3Xb62lExvZC0-Nw6NSXH707dMbGwtSN0&e="><u><font color="#0000FF">http://files.gpfsug.org/presentations/2016/SC16/12_-_Sven_Oehme_Dean_Hildebrand_-_News_from_IBM_Research.pdf</font></u></a><br><br>from those presentations regarding 32 subblocks:<br><br>"It has a significant performance penalty for small files in large block size filesystems"<br><br>although I'm not clear on the specific definition of "large". Many filesystems I encounter only have a 1M block size so it may not matter there, although that same presentation clearly shows the benefit of larger block sizes which is yet *another* thing for which a migration tool would be helpful.<br><br>-Aaron<br><br><br>On Wed, Nov 29, 2017 at 2:08 PM, Nikhil Khandelwal <<a href="mailto:nikhilk@us.ibm.com" target="_blank"><u><font color="#0000FF">nikhilk@us.ibm.com</font></u></a>> wrote:
<ul><font size="2">Hi,</font><br><font size="2"><br>I would like to clarify migration path to 5.0.0 from 4.X.X clusters. For all Spectrum Scale clusters that are currently at 4.X.X, it is possible to migrate to 5.0.0 with no offline data migration and no need to move data. Once these clusters are at 5.0.0, they will benefit from the performance improvements, new features (such as file audit logging), and various enhancements that are included in 5.0.0.</font><br><font size="2"><br>That being said, there is one enhancement that will not be applied to these clusters, and that is the increased number of sub-blocks per block for small file allocation. This means that for file systems with a large block size and a lot of small files, the overall space utilization will be the same it currently is in 4.X.X. Since file systems created at 4.X.X and earlier used a block size that kept this allocation in mind, there should be very little impact on existing file systems.</font><br><font size="2"><br>Outside of that one particular function, the remainder of the performance improvements, metadata improvements, updated compatibility, new functionality, and all of the other enhancements will be immediately available to you once you complete the upgrade to 5.0.0 -- with no need to reformat, move data, or take your data offline.</font><br><font size="2"><br>I hope that clarifies things a little and makes the upgrade path more accessible.</font><br><font size="2"><br>Please let me know if there are any other questions or concerns.</font><br><font size="2"><br>Thank you,<br>Nikhil Khandelwal<br>Spectrum Scale Development<br>Client Adoption</font><br><br>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__spectrumscale.org&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=uSf6x8SPrwMD2dUtyWuN6Gry2OFLaBIb1IX3CjxUWp8&e=" target="_blank"><u><font color="#0000FF">spectrumscale.org</font></u></a><u><font color="#0000FF"><br></font></u><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwMFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=8nZVi2Wp8LPbXo0Pg6ItJv6GEOk5jINHR05MY_H7a4w&e=" target="_blank"><u><font color="#0000FF">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</font></u></a><br></ul><tt><font size="2">_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at <a href="http://spectrumscale.org">spectrumscale.org</a><br></font></tt><tt><font size="2"><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=8nZVi2Wp8LPbXo0Pg6ItJv6GEOk5jINHR05MY_H7a4w&e=">https://urldefense.proofpoint.com/v2/url?u=http-3A__gpfsug.org_mailman_listinfo_gpfsug-2Ddiscuss&d=DwICAg&c=jf_iaSHvJObTbx-siA1ZOg&r=IbxtjdkPAM2Sbon4Lbbi4w&m=irBRNHjLNBazoPW27vuMTJGyZjdo_8yqZZNkY7RRh5I&s=8nZVi2Wp8LPbXo0Pg6ItJv6GEOk5jINHR05MY_H7a4w&e=</a></font></tt><tt><font size="2"><br></font></tt><br><br><br>
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