Trond Myklebust wrote: > At the time of the EXCHANGE_ID call, how is the server supposed to know what > kind of layout is going to be negotiated? It doesn't yet know whether the > client is even going to ask for a layout, does it? It doesn't matter. EXCHGID4_FLAG_USE_PNFS_MDS is the server's way of advertising to the client that it supports LAYOUTGET and other pNFS related operations. The client is free to ignore that message if it so desires, and just use read/write through MDS. The point here is to tell the client whether or not it should try pNFS if it can. I guess that makes sense. But I think section 13 is a bit misleading since it contains requirements for the block layout too. 13. NFSv4.1 as a Storage Protocol in pNFS: the File Layout Type This section describes the semantics and format of NFSv4.1 file-based layouts for pNFS. NFSv4.1 file-based layouts use the LAYOUT4_NFSV4_1_FILES layout type. The LAYOUT4_NFSV4_1_FILES type defines striping data across multiple NFSv4.1 data servers. -- 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
