On Mon, Mar 05, 2007 at 04:26:28PM +0000, John Hearns wrote: > That leads me to a damn stupid question - how do NFSv4 and ROMIO > interoperate then? Anyone got experience of that, > or is it signed "There be Dragons" ?
It's not a stupid question at all. It's very important to understand the impact the choice of file system has on the higher levels of the I/O software stack. ROMIO does not have a special "NFSv4" ADIO driver. ROMIO treats it like regular NFSv3. In short, you can use it, but you'll have to disable all caching to make it behave correctly. You'll get rather bad performance for most workloads, but what good is fast I/O if you get garbled data in your file? I know I beat this drum a lot, but do consider a true parallel file system like PVFS for your MPI-IO applications. GPFS and Luster would be good options too. ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Lab, IL USA B29D F333 664A 4280 315B _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
