Re: Feature request: online fsync disable

[Hans Reiser <reiser@namesys.com>]

Matthias Andree wrote:

>Hans Reiser <reiser@namesys.com> writes:
>
>  
>
>>It is a reasonable feature request I think.
>>    
>>
>
>A file system that has a switch "oh, you can throw away my data if you
>like" is no good at all.
>
Yes it is, consider tmpfs, consider web cache appliances.....  this is 
just another variation on it.

> If the application + FS interaction leads to
>contention, then you have to choices to optimize: the application or the
>file system.
>
If the app is closed source....

> We've had this kind of discussion before, with a different
>focus: on mail transfer agents. There have been considerations of
>merging fsync() operations and committing them at the same time, and
>asynchronous operation or threading might in fact help the application.
>
>I'd not trust a file system that even has a switch to let it ignore
>fsync(). Please let me know if your file systems exhibit this behaviour
>so I can statfs() in my applications and if I see a file system that
>does ignore fsync() just call raise(SIGKILL);
>
>  
>