[gpfsug-discuss] Strange timestamp behaviour on NFS via CES

Stephen Ulmer ulmer at ulmer.org
Fri Feb 3 13:35:21 GMT 2017


Does the cp actually complete? As in, does it copy all of the blocks?  What’s the exit code?

A cp’d file should have  “new” metadata. That is, it should have it’s own dates, owners, etc. (not necessarily copied from the source file).

I ran ‘strace cp foo1 foo2’, and it was pretty instructive, maybe that would get you more info. On CentOS strace is in it’s own package, YMMV.

-- 
Stephen



> On Feb 3, 2017, at 8:19 AM, Andreas Mattsson <andreas.mattsson at maxiv.lu.se <mailto:andreas.mattsson at maxiv.lu.se>> wrote:
> 
> That works.
>  
> ’touch test100’
>  
> Feb 3 14:16 test100
>  
> ‘cp test100 test101’
>  
> Feb 3 14:16 test100
> Apr 21 2027 test101
>  
> ‘touch –r test100 test101’
>  
> Feb 3 14:16 test100
> Feb 3 14:16 test101
>  
> /Andreas
>  
>  
> That’s a cool one. :)
>  
> What if you use the "random date" file as a time reference to touch another file (like, 'touch -r file02 file03’)?
>  
> -- 
> Stephen
> 
> 
>  
> On Feb 3, 2017, at 7:46 AM, Andreas Mattsson <andreas.mattsson at maxiv.lu.se <mailto:andreas.mattsson at maxiv.lu.se>> wrote:
>  
> I’m having some really strange timestamp behaviour when doing file operations on NFS mounts shared via CES on spectrum scale 4.2.1.1
> The NFS clients are up to date Centos and Debian machines.
> All Scale servers and NFS clients have correct date and time via NTP.
>  
> Creating a file, for instance ‘touch file00’, gives correct timestamp.
> Moving the file, ‘mv file00 file01’, gives correct timestamp
> Copying the file, ‘cp file01 file02’, gives a random timestamp anywhere in time, for instance Oct 12 2095 or Feb 29 1976 or something similar.
>  
> This is only via NFS. Copying the file via a native gpfs-mount or via SMB gives a correct timestamp.
> Doing the same operation over NFS to other NFS-servers works correct, it is only when operating on the NFS-share from the Spectrum Scale CES the issue occurs.
>  
> Have anyone seen this before?
>  
> Regards,
> Andreas Mattsson
> _____________________________________________
> <image001.png>
>  
> Andreas Mattsson
> Systems Engineer
>  
> MAX IV Laboratory
> Lund University
> P.O. Box 118, SE-221 00 Lund, Sweden
> Visiting address: Fotongatan 2, 225 94 Lund
> Mobile: +46 706 64 95 44
> andreas.mattsson at maxiv.se <mailto:andreas.mattsson at maxiv.se>
> www.maxiv.se <http://www.maxiv.se/>
>  
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