Section 5.7. NFS Statistics

5.7. NFS Statistics

The NFS client and server are instrumented so that they can be observed with iostat and nfsstat. For client-side mounts, iostat reports the latency for read and write operations per mount, and instead of reporting disk response times, iostat reports NFS server response times (including over-the-write latency). The -c and -s options of the nfsstat command reports both client- and server-side statistics for each NFS operation as specified in the NFS protocol.

5.7.1. NFS Client Statistics: nfsstat -c

The client-side statistics show the number of calls for RPC transport, virtual meta-data (also described as attributes), and read/write operations. The statistics are separated by NFS version number (currently 2, 3, and 4) and protocol options (TCP or UDP).

$ nfsstat -c Client rpc: Connection oriented: calls      badcalls   badxids    timeouts   newcreds   badverfs   timers 202499     0          0          0          0          0          0 cantconn   nomem      interrupts 0          0          0 Connectionless: calls      badcalls   retrans    badxids    timeouts   newcreds   badverfs 0          0          0          0          0          0          0 timers     nomem      cantsend 0          0          0 Client nfs: calls     badcalls  clgets    cltoomany 200657    0         200657    7 Version 2: (0 calls) null     getattr  setattr  root     lookup   readlink read     wrcache 0 0%     0 0%     0 0%     0 0%     0 0%     0 0%     0 0%     0 0% write    create   remove   rename   link     symlink  mkdir    rmdir 0 0%     0 0%     0 0%     0 0%     0 0%     0 0%     0 0%     0 0% readdir  statfs 0 0%     0 0% Version 3: (0 calls) null        getattr     setattr     lookup      access      readlink 0 0%        0 0%        0 0%        0 0%        0 0%        0 0% read        write       create      mkdir       symlink     mknod 0 0%        0 0%        0 0%        0 0%        0 0%        0 0% remove      rmdir       rename      link        readdir     readdirplus 0 0%        0 0%        0 0%        0 0%        0 0%        0 0% fsstat      fsinfo      pathconf    commit 0 0%        0 0%        0 0%        0 0% 

5.7.2. NFS Server Statistics: nfsstat -s

The NFS server-side statistics show the NFS operations performed by the NFS server.

$ nfsstat -s Server rpc: Connection oriented: calls      badcalls   nullrecv   badlen     xdrcall    dupchecks  dupreqs 5897288    0          0          0          0          372803     0 Connectionless: calls      badcalls   nullrecv   badlen     xdrcall    dupchecks  dupreqs 87324      0          0          0          0          0          0 ... Version 4: (949163 calls) null                compound 3175 0%             945988 99% Version 4: (3284515 operations) reserved            access              close               commit 0 0%                72954 2%            199208 6%           2948 0% create              delegpurge          delegreturn         getattr 4 0%                0 0%                16451 0%            734376 22% getfh               link                lock                lockt 345041 10%          6 0%                101 0%              0 0% locku               lookup              lookupp             nverify 101 0%              145651 4%           5715 0%             171515 5% open                openattr            open_confirm        open_downgrade 199410 6%           0 0%                271 0%              0 0% putfh               putpubfh            putrootfh           read 914825 27%          0 0%                581 0%              130451 3% readdir             readlink            remove              rename 5661 0%             11905 0%            15 0%               201 0% renew               restorefh           savefh              secinfo 30765 0%            140543 4%           146336 4%           277 0% setattr             setclientid         setclientid_confirm verify 23 0%               26 0%               26 0%               10 0% write               release_lockowner   illegal 9118 0%             0 0%                0 0% ...