<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Thank you.<br class=""><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">-- <br class="">Stephen<br class=""><br class=""><br class=""></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Nov 29, 2017, at 2:08 PM, Nikhil Khandelwal <<a href="mailto:nikhilk@us.ibm.com" class="">nikhilk@us.ibm.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><p class=""><font size="2" class="">Hi,</font><br class=""><br class=""><font size="2" class="">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 class=""><br class=""><font size="2" class="">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 class=""><br class=""><font size="2" class="">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 class=""><br class=""><font size="2" class="">I hope that clarifies things a little and makes the upgrade path more accessible.</font><br class=""><br class=""><font size="2" class="">Please let me know if there are any other questions or concerns.</font><br class=""><br class=""><font size="2" class="">Thank you,</font><br class=""><font size="2" class="">Nikhil Khandelwal</font><br class=""><font size="2" class="">Spectrum Scale Development</font><br class=""><font size="2" class="">Client Adoption</font><br class="">
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