blog/Detecting_NFS_hangs_on_Linux_without_hanging_yourself___.html

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   6     <title>Petter Reinholdtsen: Detecting NFS hangs on Linux without hanging yourself...</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Detecting NFS hangs on Linux without hanging yourself...</div>
  24       <div class="date"> 9th March 2017</div>
  25       <div class="body"><p>Over the years, administrating thousand of NFS mounting linux
  26 computers at the time, I often needed a way to detect if the machine
  27 was experiencing NFS hang.  If you try to use <tt>df</tt> or look at a
  28 file or directory affected by the hang, the process (and possibly the
  29 shell) will hang too.  So you want to be able to detect this without
  30 risking the detection process getting stuck too.  It has not been
  31 obvious how to do this.  When the hang has lasted a while, it is
  32 possible to find messages like these in dmesg:</p>
  33
  34 <p><blockquote>
  35 nfs: server nfsserver not responding, still trying
  36 <br>nfs: server nfsserver OK
  37 </blockquote></p>
  38
  39 <p>It is hard to know if the hang is still going on, and it is hard to
  40 be sure looking in dmesg is going to work.  If there are lots of other
  41 messages in dmesg the lines might have rotated out of site before they
  42 are noticed.</p>
  43
  44 <p>While reading through the nfs client implementation in linux kernel
  45 code, I came across some statistics that seem to give a way to detect
  46 it.  The om_timeouts sunrpc value in the kernel will increase every
  47 time the above log entry is inserted into dmesg.  And after digging a
  48 bit further, I discovered that this value show up in
  49 /proc/self/mountstats on Linux.</p>
  50
  51 <p>The mountstats content seem to be shared between files using the
  52 same file system context, so it is enough to check one of the
  53 mountstats files to get the state of the mount point for the machine.
  54 I assume this will not show lazy umounted NFS points, nor NFS mount
  55 points in a different process context (ie with a different filesystem
  56 view), but that does not worry me.</p>
  57
  58 <p>The content for a NFS mount point look similar to this:</p>
  59
  60 <p><blockquote><pre>
  61 [...]
  62 device /dev/mapper/Debian-var mounted on /var with fstype ext3
  63 device nfsserver:/mnt/nfsserver/home0 mounted on /mnt/nfsserver/home0 with fstype nfs statvers=1.1
  64         opts:   rw,vers=3,rsize=65536,wsize=65536,namlen=255,acregmin=3,acregmax=60,acdirmin=30,acdirmax=60,soft,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=129.240.3.145,mountvers=3,mountport=4048,mountproto=udp,local_lock=all
  65         age:    7863311
  66         caps:   caps=0x3fe7,wtmult=4096,dtsize=8192,bsize=0,namlen=255
  67         sec:    flavor=1,pseudoflavor=1
  68         events: 61063112 732346265 1028140 35486205 16220064 8162542 761447191 71714012 37189 3891185 45561809 110486139 4850138 420353 15449177 296502 52736725 13523379 0 52182 9016896 1231 0 0 0 0 0
  69         bytes:  166253035039 219519120027 0 0 40783504807 185466229638 11677877 45561809
  70         RPC iostats version: 1.0  p/v: 100003/3 (nfs)
  71         xprt:   tcp 925 1 6810 0 0 111505412 111480497 109 2672418560317 0 248 53869103 22481820
  72         per-op statistics
  73                 NULL: 0 0 0 0 0 0 0 0
  74              GETATTR: 61063106 61063108 0 9621383060 6839064400 453650 77291321 78926132
  75              SETATTR: 463469 463470 0 92005440 66739536 63787 603235 687943
  76               LOOKUP: 17021657 17021657 0 3354097764 4013442928 57216 35125459 35566511
  77               ACCESS: 14281703 14290009 5 2318400592 1713803640 1709282 4865144 7130140
  78             READLINK: 125 125 0 20472 18620 0 1112 1118
  79                 READ: 4214236 4214237 0 715608524 41328653212 89884 22622768 22806693
  80                WRITE: 8479010 8494376 22 187695798568 1356087148 178264904 51506907 231671771
  81               CREATE: 171708 171708 0 38084748 46702272 873 1041833 1050398
  82                MKDIR: 3680 3680 0 773980 993920 26 23990 24245
  83              SYMLINK: 903 903 0 233428 245488 6 5865 5917
  84                MKNOD: 80 80 0 20148 21760 0 299 304
  85               REMOVE: 429921 429921 0 79796004 61908192 3313 2710416 2741636
  86                RMDIR: 3367 3367 0 645112 484848 22 5782 6002
  87               RENAME: 466201 466201 0 130026184 121212260 7075 5935207 5961288
  88                 LINK: 289155 289155 0 72775556 67083960 2199 2565060 2585579
  89              READDIR: 2933237 2933237 0 516506204 13973833412 10385 3190199 3297917
  90          READDIRPLUS: 1652839 1652839 0 298640972 6895997744 84735 14307895 14448937
  91               FSSTAT: 6144 6144 0 1010516 1032192 51 9654 10022
  92               FSINFO: 2 2 0 232 328 0 1 1
  93             PATHCONF: 1 1 0 116 140 0 0 0
  94               COMMIT: 0 0 0 0 0 0 0 0
  95
  96 device binfmt_misc mounted on /proc/sys/fs/binfmt_misc with fstype binfmt_misc
  97 [...]
  98 </pre></blockquote></p>
  99
 100 <p>The key number to look at is the third number in the per-op list.
 101 It is the number of NFS timeouts experiences per file system
 102 operation.  Here 22 write timeouts and 5 access timeouts.  If these
 103 numbers are increasing, I believe the machine is experiencing NFS
 104 hang.  Unfortunately the timeout value do not start to increase right
 105 away.  The NFS operations need to time out first, and this can take a
 106 while.  The exact timeout value depend on the setup.  For example the
 107 defaults for TCP and UDP mount points are quite different, and the
 108 timeout value is affected by the soft, hard, timeo and retrans NFS
 109 mount options.</p>
 110
 111 <p>The only way I have been able to get working on Debian and RedHat
 112 Enterprise Linux for getting the timeout count is to peek in /proc/.
 113 But according to
 114 <ahref="http://docs.oracle.com/cd/E19253-01/816-4555/netmonitor-12/index.html">Solaris
 115 10 System Administration Guide: Network Services</a>, the 'nfsstat -c'
 116 command can be used to get these timeout values.  But this do not work
 117 on Linux, as far as I can tell.  I
 118 <ahref="http://bugs.debian.org/857043">asked Debian about this</a>,
 119 but have not seen any replies yet.</p>
 120
 121 <p>Is there a better way to figure out if a Linux NFS client is
 122 experiencing NFS hangs?  Is there a way to detect which processes are
 123 affected?  Is there a way to get the NFS mount going quickly once the
 124 network problem causing the NFS hang has been cleared?  I would very
 125 much welcome some clues, as we regularly run into NFS hangs.</p>
 126 </div>
 127
 128       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin</a>.</div>
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 397
 398 </ul></li>
 399
 400 <li>2009
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 426
 427 </ul></li>
 428
 429 <li>2008
 430 <ul>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 435
 436 </ul></li>
 437
 438 </ul>
 439
 440
 441
 442 <h2>Tags</h2>
 443 <ul>
 444
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 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (164)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (393)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (19)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
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 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (191)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (34)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (72)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (107)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 560
 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (13)</a></li>
 562
 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (70)</a></li>
 564
 565  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 566
 567  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 568
 569 </ul>
 570
 571
 572     </div>
 573     <p style="text-align: right">
 574  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 575 </p>
 576
 577   </body>
 578 </html>