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Hi all,
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<div>One minor correction to the below \u2026 while JAB is correct that it is a common misconception that ctime is file creation time, it is also more than \u201cthe time you last changed permissions.\u201d The man page for ls on a RHEL 8 system describes it as \u201ctime of
last modification of file status information.\u201d I.e., it\u2019s the time _any_ file metadata was updated \u2026 so any update to a files\u2019 inode updates ctime. Thanks\u2026</div>
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<div>Kevin B.<br id="lineBreakAtBeginningOfMessage">
<div>\u2014<br>
Kevin Buterbaugh<br>
Sandia National Laboratories - HPC Development (9328)<br>
Office: (505)284-1470, Work iPhone: (505)288-1959<br>
my_email = "@".join(["klbuter", ".".join(["sandia", "gov"])]) </div>
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<div>On Oct 1, 2026, at 7:34\u202fAM, Jonathan Buzzard via gpfsug-discuss <gpfsug-discuss@gpfsug.org> wrote:</div>
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<div>On 01/10/2026 14:22, Ahmed Essam Mahrous Gaber Elmazaty via gpfsug-<br>
discuss wrote:<br>
<blockquote type="cite">In addition to rsync, we have migrated to GPFS using AFM and it<br>
preserves all the metadata including modification timestamps Best<br>
regards,<br>
</blockquote>
If it does then a GPFS API must exist even if undocumented for modifying it. However I don't think it does.<br>
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Note that creation/birth time is not POSIX and GPFS only acquired it in version 3.2 from memory, at the same time as MS-DOS attributes were added. Presumably added as part of being able to mount GPFS on Windows, with the fun fact you needed a GPFS file system
created under 3.2 or later to do so.<br>
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It is a common misconception that ctime is a creation time, it is in fact the time you last changed permissions.<br>
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I am talking about the "Creation Time" as reported by mmlsattr -L or on XFS the Birth time you see on when stating the file.<br>
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JAB.<br>
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-- <br>
Jonathan A. Buzzard Tel: +44141-5483420<br>
HPC System Administrator, ARCHIE-WeSt.<br>
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG<br>
<br>
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