On Wed, Feb 11, 2015 at 05:35:22PM -0500, J. Bruce Fields wrote: > On Tue, Feb 03, 2015 at 07:35:33PM +0100, Christoph Hellwig wrote: > > On Mon, Feb 02, 2015 at 02:48:26PM -0500, J. Bruce Fields wrote: > > > Previously: http://lkml.kernel.org/r/20150106175611.GA16413@xxxxxx > > > > > > > - 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. > > > > > > Which sounds reasonable to me, but I haven't tried to incorporate this > > > into my regression testing yet. > > > > Additionally I can offer the following script to generate recalls, > > which don't really happen during normal operation. I don't > > really know how to write a proper testcase that coordinates access > > to the exported filesystem and nfs unless it runs locally on the same node, > > though. It would need some higher level, network aware test harness: > > Thanks. I got as far as doing a quick manual test with vm's sharing a > "disk": Oh, also I forgot, on fedora: [root@f21-2]# systemctl enable nfs-blkmap.target > [root@f21-2]# mount -overs=4.1 f21-1:/exports/xfs-pnfs /mnt/ > [root@f21-2]# echo "hello world" >/mnt/testfile > [root@f21-2]# grep LAYOUTGET /proc/self/mountstats > LAYOUTGET: 1 1 0 236 196 0 4 4 > > I haven't tried to set up automated testing with recalls, but that > shouldn't be hard. > > --b. > > > > > ----- snip ----- > > #!/bin/sh > > > > set +x > > > > # wait for grace period > > touch /mnt/nfs1/foo > > > > dd if=/dev/zero of=/mnt/nfs1/foo bs=128M count=32 conv=fdatasync oflag=direct & > > > > sleep 2 > > > > echo "" > /mnt/test/foo && echo "recall done" -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
