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   6     <title>Petter Reinholdtsen: entries from November 2017</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     <h3>Entries from November 2017.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/Some_notes_on_fault_tolerant_storage_systems.html">Some notes on fault tolerant storage systems</a>
  27       </div>
  28       <div class="date">
  29          1st November 2017
  30       </div>
  31       <div class="body">
  32         <p>If you care about how fault tolerant your storage is, you might
  33 find these articles and papers interesting.  They have formed how I
  34 think of when designing a storage system.</p>
  35
  36 <ul>
  37
  38 <li>USENIX :login; <a
  39 href="https://www.usenix.org/publications/login/summer2017/ganesan">Redundancy
  40 Does Not Imply Fault Tolerance.  Analysis of Distributed Storage
  41 Reactions to Single Errors and Corruptions</a> by Aishwarya Ganesan,
  42 Ramnatthan Alagappan, Andrea C. Arpaci-Dusseau, and Remzi
  43 H. Arpaci-Dusseau</li>
  44
  45 <li>ZDNet
  46 <a href="http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/">Why
  47 RAID 5 stops working in 2009</a> by Robin Harris</li>
  48
  49 <li>ZDNet
  50 <a href="http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/">Why
  51 RAID 6 stops working in 2019</a> by Robin Harris</li>
  52
  53 <li>USENIX FAST'07
  54 <a href="http://research.google.com/archive/disk_failures.pdf">Failure
  55 Trends in a Large Disk Drive Population</a> by Eduardo Pinheiro,
  56 Wolf-Dietrich Weber and Luiz André Barroso</li>
  57
  58 <li>USENIX ;login: <a
  59 href="https://www.usenix.org/system/files/login/articles/hughes12-04.pdf">Data
  60 Integrity.  Finding Truth in a World of Guesses and Lies</a> by Doug
  61 Hughes</li>
  62
  63 <li>USENIX FAST'08
  64 <a href="https://www.usenix.org/events/fast08/tech/full_papers/bairavasundaram/bairavasundaram_html/">An
  65 Analysis of Data Corruption in the Storage Stack</a> by
  66 L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C.
  67 Arpaci-Dusseau, and R. H. Arpaci-Dusseau</li>
  68
  69 <li>USENIX FAST'07 <a
  70 href="https://www.usenix.org/legacy/events/fast07/tech/schroeder/schroeder_html/">Disk
  71 failures in the real world: what does an MTTF of 1,000,000 hours mean
  72 to you?</a> by B. Schroeder and G. A. Gibson.</li>
  73
  74 <li>USENIX ;login: <a
  75 href="https://www.usenix.org/events/fast08/tech/full_papers/jiang/jiang_html/">Are
  76 Disks the Dominant Contributor for Storage Failures?  A Comprehensive
  77 Study of Storage Subsystem Failure Characteristics</a> by Weihang
  78 Jiang, Chongfeng Hu, Yuanyuan Zhou, and Arkady Kanevsky</li>
  79
  80 <li>SIGMETRICS 2007
  81 <a href="http://research.cs.wisc.edu/adsl/Publications/latent-sigmetrics07.pdf">An
  82 analysis of latent sector errors in disk drives</a> by
  83 L. N. Bairavasundaram, G. R. Goodson, S. Pasupathy, and J. Schindler</li>
  84
  85 </ul>
  86
  87 <p>Several of these research papers are based on data collected from
  88 hundred thousands or millions of disk, and their findings are eye
  89 opening.  The short story is simply do not implicitly trust RAID or
  90 redundant storage systems.  Details matter.  And unfortunately there
  91 are few options on Linux addressing all the identified issues.  Both
  92 ZFS and Btrfs are doing a fairly good job, but have legal and
  93 practical issues on their own.  I wonder how cluster file systems like
  94 Ceph do in this regard.  After all, there is an old saying, you know
  95 you have a distributed system when the crash of a compyter you have
  96 never heard of stops you from getting any work done.  The same holds
  97 true if fault tolerance do not work.</p>
  98
  99 <p>Just remember, in the end, it do not matter how redundant, or how
 100 fault tolerant your storage is, if you do not continuously monitor its
 101 status to detect and replace failed disks.</p>
 102
 103       </div>
 104       <div class="tags">
 105
 106
 107         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/raid">raid</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin</a>.
 108
 109
 110       </div>
 111     </div>
 112     <div class="padding"></div>
 113
 114     <p style="text-align: right;"><a href="11.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
 115     <div id="sidebar">
 116
 117
 118
 119 <h2>Archive</h2>
 120 <ul>
 121
 122 <li>2017
 123 <ul>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 132
 133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 134
 135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 136
 137 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 138
 139 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 140
 141 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 142
 143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (1)</a></li>
 144
 145 </ul></li>
 146
 147 <li>2016
 148 <ul>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 161
 162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 163
 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 165
 166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 167
 168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 173
 174 </ul></li>
 175
 176 <li>2015
 177 <ul>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 190
 191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 192
 193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 194
 195 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 200
 201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 202
 203 </ul></li>
 204
 205 <li>2014
 206 <ul>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 221
 222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 223
 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 229
 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 231
 232 </ul></li>
 233
 234 <li>2013
 235 <ul>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 258
 259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 260
 261 </ul></li>
 262
 263 <li>2012
 264 <ul>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 289
 290 </ul></li>
 291
 292 <li>2011
 293 <ul>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 318
 319 </ul></li>
 320
 321 <li>2010
 322 <ul>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 347
 348 </ul></li>
 349
 350 <li>2009
 351 <ul>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 366
 367 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 370
 371 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 372
 373 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 374
 375 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 376
 377 </ul></li>
 378
 379 <li>2008
 380 <ul>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 385
 386 </ul></li>
 387
 388 </ul>
 389
 390
 391
 392 <h2>Tags</h2>
 393 <ul>
 394
 395  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (14)</a></li>
 396
 397  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 398
 399  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 400
 401  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 402
 403  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 404
 405  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
 406
 407  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 408
 409  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 410
 411  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (154)</a></li>
 412
 413  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 414
 415  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 416
 417  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 418
 419  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 420
 421  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (24)</a></li>
 422
 423  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 424
 425  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (358)</a></li>
 426
 427  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 428
 429  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 430
 431  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (30)</a></li>
 432
 433  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 434
 435  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
 436
 437  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 438
 439  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 440
 441  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (15)</a></li>
 442
 443  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 444
 445  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (9)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (293)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (189)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (65)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (104)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (52)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
 514
 515 </ul>
 516
 517
 518     </div>
 519     <p style="text-align: right">
 520  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 521 </p>
 522
 523   </body>
 524 </html>