[Pvfs2-developers] Sys create setting the datafile nodes depending on interface call.

[Julian Martin Kunkel]

Hi,
we talked about adding a request ID to the system interface. Therefore I think 
we discussed adding a new  parameter all system interface calls which can be 
set from MPI or the client core. I think when we extend the list of 
parameters then we could easily add another parameter as well, if needed. 
Thats why I bring it up in this email :)

Background:
Our working group in Heidelberg is interesting to give the client the ability  
to set the nodes on which the datafiles will be created instead of choosing 
them randomly, I think we had a patch somewhere, but I think it used another 
distribution and did never work clean so that you could integrate it easily. 
Instead of introducing another distribution I was thinking that this might be 
useful for all distibutions, so maybe a new parameter can be given to 
*sys_create which contains the names (!) of the servers on which the 
datafiles should be generated. Or maybe another flag struct could be used and 
can be extended for other use cases as well ?
The client sm could use the server names during  
create_datafiles_setup_msgpair_array and set them according to the names 
instead of using PINT_cached_config_get_next_io to determine the datafile 
servers. 

Please tell us your opinion on this issue, thanks and enjoy your days,
Julian