[lustre-discuss] What happens when a file grows

[Dilger, Andreas]

Typically OST usage is well balanced unless you have a single very large file that fills an OST. It is possible to use "lfs migrate" to move files to other OSTs and restripe them as needed to balance space. 

In the 2.10 release we will have progressive file layouts (PFL) that will allow a file to increase striping as the size grows, which will largely avoid this problem. 

Cheers, Andreas

> On Mar 30, 2017, at 14:59, E.S. Rosenberg <esr+lustre at mail.hebrew.edu> wrote:
> 
> Hi all,
> I was wondering about the following scenario:
> 
> What happens when a file is created without striping and it gets larger then the available space on the OST that it is on?
> Does it now fail to  write because adding stripes is impossible after a file exists or will the rest of the file get written to a different OST and the user never notice?
> 
> Thanks,
> Eli
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