blog/Some_notes_on_fault_tolerant_storage_systems.html

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   6     <title>Petter Reinholdtsen: Some notes on fault tolerant storage systems</title>
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  14  <h1>
  15      <a href="https://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Some notes on fault tolerant storage systems</div>
  24       <div class="date"> 1st November 2017</div>
  25       <div class="body"><p>If you care about how fault tolerant your storage is, you might
  26 find these articles and papers interesting.  They have formed how I
  27 think of when designing a storage system.</p>
  28
  29 <ul>
  30
  31 <li>USENIX :login; <a
  32 href="https://www.usenix.org/publications/login/summer2017/ganesan">Redundancy
  33 Does Not Imply Fault Tolerance.  Analysis of Distributed Storage
  34 Reactions to Single Errors and Corruptions</a> by Aishwarya Ganesan,
  35 Ramnatthan Alagappan, Andrea C. Arpaci-Dusseau, and Remzi
  36 H. Arpaci-Dusseau</li>
  37
  38 <li>ZDNet
  39 <a href="http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/">Why
  40 RAID 5 stops working in 2009</a> by Robin Harris</li>
  41
  42 <li>ZDNet
  43 <a href="http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/">Why
  44 RAID 6 stops working in 2019</a> by Robin Harris</li>
  45
  46 <li>USENIX FAST'07
  47 <a href="http://research.google.com/archive/disk_failures.pdf">Failure
  48 Trends in a Large Disk Drive Population</a> by Eduardo Pinheiro,
  49 Wolf-Dietrich Weber and Luiz André Barroso</li>
  50
  51 <li>USENIX ;login: <a
  52 href="https://www.usenix.org/system/files/login/articles/hughes12-04.pdf">Data
  53 Integrity.  Finding Truth in a World of Guesses and Lies</a> by Doug
  54 Hughes</li>
  55
  56 <li>USENIX FAST'08
  57 <a href="https://www.usenix.org/events/fast08/tech/full_papers/bairavasundaram/bairavasundaram_html/">An
  58 Analysis of Data Corruption in the Storage Stack</a> by
  59 L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C.
  60 Arpaci-Dusseau, and R. H. Arpaci-Dusseau</li>
  61
  62 <li>USENIX FAST'07 <a
  63 href="https://www.usenix.org/legacy/events/fast07/tech/schroeder/schroeder_html/">Disk
  64 failures in the real world: what does an MTTF of 1,000,000 hours mean
  65 to you?</a> by B. Schroeder and G. A. Gibson.</li>
  66
  67 <li>USENIX ;login: <a
  68 href="https://www.usenix.org/events/fast08/tech/full_papers/jiang/jiang_html/">Are
  69 Disks the Dominant Contributor for Storage Failures?  A Comprehensive
  70 Study of Storage Subsystem Failure Characteristics</a> by Weihang
  71 Jiang, Chongfeng Hu, Yuanyuan Zhou, and Arkady Kanevsky</li>
  72
  73 <li>SIGMETRICS 2007
  74 <a href="http://research.cs.wisc.edu/adsl/Publications/latent-sigmetrics07.pdf">An
  75 analysis of latent sector errors in disk drives</a> by
  76 L. N. Bairavasundaram, G. R. Goodson, S. Pasupathy, and J. Schindler</li>
  77
  78 </ul>
  79
  80 <p>Several of these research papers are based on data collected from
  81 hundred thousands or millions of disk, and their findings are eye
  82 opening.  The short story is simply do not implicitly trust RAID or
  83 redundant storage systems.  Details matter.  And unfortunately there
  84 are few options on Linux addressing all the identified issues.  Both
  85 ZFS and Btrfs are doing a fairly good job, but have legal and
  86 practical issues on their own.  I wonder how cluster file systems like
  87 Ceph do in this regard.  After all, there is an old saying, you know
  88 you have a distributed system when the crash of a computer you have
  89 never heard of stops you from getting any work done.  The same holds
  90 true if fault tolerance do not work.</p>
  91
  92 <p>Just remember, in the end, it do not matter how redundant, or how
  93 fault tolerant your storage is, if you do not continuously monitor its
  94 status to detect and replace failed disks.</p>
  95
  96 <p>As usual, if you use Bitcoin and want to show your support of my
  97 activities, please send Bitcoin donations to my address
  98 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
  99 </div>
 100
 101       <div class="tags">Tags: <a href="https://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="https://people.skolelinux.org/pere/blog/tags/raid">raid</a>, <a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin</a>.</div>
 102
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 113 <h2>Archive</h2>
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 172
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 176
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 178
 179 <li>2020
 180 <ul>
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 199
 200 </ul></li>
 201
 202 <li>2019
 203 <ul>
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 206
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 222
 223 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 224
 225 </ul></li>
 226
 227 <li>2018
 228 <ul>
 229
 230 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 231
 232 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 233
 234 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 235
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 238 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 239
 240 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
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 242 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
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 244 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
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 246 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
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 248 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 249
 250 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 251
 252 </ul></li>
 253
 254 <li>2017
 255 <ul>
 256
 257 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 258
 259 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 260
 261 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 262
 263 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 264
 265 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 266
 267 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 268
 269 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 270
 271 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
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 273 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
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 275 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 276
 277 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 278
 279 </ul></li>
 280
 281 <li>2016
 282 <ul>
 283
 284 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 285
 286 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 287
 288 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
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 291
 292 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
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 294 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 295
 296 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 297
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 305
 306 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 307
 308 </ul></li>
 309
 310 <li>2015
 311 <ul>
 312
 313 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 314
 315 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 316
 317 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 318
 319 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 320
 321 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 322
 323 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 324
 325 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 326
 327 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 328
 329 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 330
 331 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 332
 333 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 334
 335 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 336
 337 </ul></li>
 338
 339 <li>2014
 340 <ul>
 341
 342 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 343
 344 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 345
 346 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 347
 348 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 349
 350 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
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 354 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 355
 356 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
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 358 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
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 360 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
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 363
 364 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 365
 366 </ul></li>
 367
 368 <li>2013
 369 <ul>
 370
 371 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 372
 373 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 374
 375 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 376
 377 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 378
 379 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
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 381 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
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 383 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
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 385 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
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 387 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 388
 389 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
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 391 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 392
 393 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 394
 395 </ul></li>
 396
 397 <li>2012
 398 <ul>
 399
 400 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 401
 402 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
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 404 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
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 406 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
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 408 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
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 410 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
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 421
 422 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 423
 424 </ul></li>
 425
 426 <li>2011
 427 <ul>
 428
 429 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 430
 431 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
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 433 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
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 435 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
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 437 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
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 439 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
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 441 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
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 443 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
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 445 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
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 447 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
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 449 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 450
 451 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 452
 453 </ul></li>
 454
 455 <li>2010
 456 <ul>
 457
 458 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 459
 460 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 461
 462 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 465
 466 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
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 468 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
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 470 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 471
 472 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 473
 474 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 475
 476 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 477
 478 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 479
 480 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 481
 482 </ul></li>
 483
 484 <li>2009
 485 <ul>
 486
 487 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 488
 489 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 490
 491 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 492
 493 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 494
 495 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 496
 497 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 498
 499 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 500
 501 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 502
 503 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 504
 505 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 506
 507 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 508
 509 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 510
 511 </ul></li>
 512
 513 <li>2008
 514 <ul>
 515
 516 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 517
 518 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 519
 520 </ul></li>
 521
 522 </ul>
 523
 524
 525
 526 <h2>Tags</h2>
 527 <ul>
 528
 529  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 530
 531  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 532
 533  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 534
 535  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 536
 537  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 538
 539  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 540
 541  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 542
 543  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 544
 545  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 546
 547  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (194)</a></li>
 548
 549  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 550
 551  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 552
 553  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 554
 555  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 556
 557  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (30)</a></li>
 558
 559  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 560
 561  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (451)</a></li>
 562
 563  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 564
 565  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 566
 567  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 568
 569  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 570
 571  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 572
 573  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 574
 575  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 576
 577  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 578
 579  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 580
 581  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (6)</a></li>
 582
 583  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 584
 585  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 586
 587  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 588
 589  <li><a href="https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (5)</a></li>
 590
 591  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 592
 593  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 594
 595  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 596
 597  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 598
 599  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (46)</a></li>
 600
 601  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (15)</a></li>
 602
 603  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 604
 605  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (321)</a></li>
 606
 607  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
 608
 609  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (40)</a></li>
 610
 611  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 612
 613  <li><a href="https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 614
 615  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 616
 617  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 618
 619  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 620
 621  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 622
 623  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 624
 625  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 626
 627  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (17)</a></li>
 628
 629  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 630
 631  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 632
 633  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 634
 635  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 636
 637  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 638
 639  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 640
 641  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (74)</a></li>
 642
 643  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 644
 645  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 646
 647  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (64)</a></li>
 648
 649  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 650
 651  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 652
 653  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 654
 655  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (20)</a></li>
 656
 657  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (79)</a></li>
 658
 659  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 660
 661  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 662
 663 </ul>
 664
 665
 666     </div>
 667     <p style="text-align: right">
 668  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 669 </p>
 670
 671   </body>
 672 </html>