Trond Myklebust wrote: > On Fri, 2009-03-13 at 13:36 -0700, David Rees wrote: > >> > > You don't need conv=fdatasync when writing to NFS. The close-to-open > cache consistency automatically guarantees fdatasync on close(). > Yes...but at least some versions of dd will print a performance number at the end, where the time delta used in the calculation includes the fdatasync() time but not the close() time. So conv=fdatasync is a useful trick to get accurate performance numbers from dd. Personally I don't use that metric from dd because it's a simple overall average and I like to watch the time behaviour of the transfer rate. -- Greg Banks, P.Engineer, SGI Australian Software Group. the brightly coloured sporks of revolution. I don't speak for SGI. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
