[lustre-discuss] Timestamp doesn't show nano seconds

[Dilger, Andreas]

On Oct 11, 2017, at 05:38, Biju C P <cpbiju at gmail.com> wrote:
> 
> Hi,
> 
> All the files created under lustre filesystem are not storing the nano seconds in timestamp. Is it by design ? If so, what will be the reason not to store the nano seconds timestamp ?
> 
> [root at localhost dir1]# stat testfile18.log 
> 
>   File: ‘testfile18.log’
> 
>   Size: 384       Blocks: 8          IO Block: 4194304 regular file
> 
> Device: 2c54f966h/743766374d	Inode: 144115206178471951  Links: 1
> 
> Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
> 
> Context: unconfined_u:object_r:admin_home_t:s0
> 
> Access: 2017-10-11 11:31:15.000000000 +0000
> 
> Modify: 2017-10-11 11:31:15.000000000 +0000
> 
> Change: 2017-10-11 11:31:15.000000000 +0000
> 
>  Birth: -


Lustre has not implemented sub-second timestamps, as the kernel and ext3
did not have support for this when it was first developed, and until now
no users have asked for it, as this would add overhead for updating
timestamps multiple times a second.

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation