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On Jul 2, 2020, at 11:17, Chad DeWitt <<a href="mailto:ccdewitt@uncc.edu" class="">ccdewitt@uncc.edu</a>> wrote:<br class="">
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<div dir="ltr" class="">Good afternoon, All
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<div class="">I hope everyone is doing well.</div>
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<div class="">I had a few questions concerning <i class="">LU-13645 - Various data corruptions possible in lustre</i> [<a href="https://jira.whamcloud.com/browse/LU-13645" class="">https://jira.whamcloud.com/browse/LU-13645</a>].</div>
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<div class="">We are looking at deploying Lustre 2.12.5 and while browsing JIRA, this particular issue caught my attention. I read the issue, however, I can't determine if it is severe enough to prevent upgrading. </div>
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<div class="">Is anyone familiar with this issue and its severity/prevalence? Has anyone else upgraded to 2.12.5?</div>
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<div>Chad,</div>
<div>from what I can see in that ticket, this problem (or problems) largely affect specific features that are not used by default - lockahead and SEL, and possibly DoM. </div>
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<div>The lockahead feature is only used with a specific versions of MPI ADIO libraries, so it is unlikely that you are using it. Similarly, SEL is new and doesn't even exist in the 2.12 release. While DoM is in the 2.12 release, but from reading the ticket,
it sounds like this issue is very difficult to reproduce, so either you are currently (not) seeing it, or (more likely) you aren't using DoM at all (you would know if you are), so upgrading to 2.12.5 doesn't affect this either way.</div>
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<div>Cheers, Andreas</div>
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<div>Andreas Dilger</div>
<div>Principal Lustre Architect</div>
<div>Whamcloud</div>
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