[HPDD-discuss] nfsd export accounting

Hi, We have a bunch of clients exporting Lustre over NFS and we'd like to graph the data read/written by nfsd. With standard NFS servers (with attached disks) we can use /proc/{nfsd PID}/io to track the bytes read from disk but only write_bytes is updated when exporting a Lustre filesystem. Could we use stats_track_pid instead to record the reads for the nfsd processes even though it's in the kernel? Is there a good reason why /proc/PID/io/read_bytes never gets updated for the nfsd processes? It's like nfsd is serving the data directly from the VFS cache so nfsd doesn't register a read from Lustre. These export servers don't exclusively do NFS exporting otherwise we would just use the network bytes out. Regards, Daire