On Tue, 6 Jan 2015 18:56:11 +0100 Christoph Hellwig <hch@xxxxxx> wrote: > On Tue, Jan 06, 2015 at 12:32:22PM -0500, J. Bruce Fields wrote: > > - do we have evidence that this is useful in its current form? > > What is your threshold for usefulness? It passes xfstests fine, and > shows linear scalability with multiple clients that each have 10GB > links. > > > - any advice on testing? Is there was some simple virtual setup > > that would allow any loser with no special hardware (e.g., me) > > to check whether they've broken the block server? > > Run two kvm VMs that share the same disk. Create an XFS filesystem > on the MDS, and export it. If the client has blkmapd running (on Debian > it needs to be started manually) it will use pNFS for accessing the > filesystem. Verify that using the per-operation counters in > /proc/self/mounstats. Repeat with additional clients as nessecary. > > Alternatively set up a simple iSCSI target using tgt or lio and > connect to it from multiple clients. > > > - any debugging advice? E.g., have you checked if current > > wireshark can handle the MDS traffic? > > The wireshare version I've used decoded the generic pNFS operations > fine, but just dumps the layout specifics as hex data. > > Enable the trace points added in this series, they track all stateid > interactions in the server. Additіonally the pnfs debug printks on > client and server dump a lot of information. The wireshark decoder really only handles files layouts right now. Dros has some patches to add flexfiles support too (once the spec is a bit more finalized) and at that point it shouldn't be too hard to fix it to handle block layout as well. -- Jeff Layton <jlayton@xxxxxxxxxxxxxxx> _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
