blog/Using_bar_codes_at_a_computing_center.html

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   6     <title>Petter Reinholdtsen: Using bar codes at a computing center</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">Using bar codes at a computing center</div>
  24       <div class="date">20th February 2009</div>
  25       <div class="body"><p>At work with the University of Oslo, we have several hundred computers
  26 in our computing center.  This give us a challenge in tracking the
  27 location and cabling of the computers, when they are added, moved and
  28 removed.  Some times the location register is not updated when a
  29 computer is inserted or moved and we then have to search the room for
  30 the "missing" computer.</p>
  31
  32 <p>In the last issue of Linux Journal, I came across a project
  33 <a href="http://www.libdmtx.org/">libdmtx</a> to write and read bar
  34 code blocks as defined in the
  35 <a href="http://en.wikipedia.org/wiki/Data_Matrix">The Data Matrix
  36 Standard</a>.  This is bar codes that can be read with a normal
  37 digital camera, for example that on a cell phone, and several such bar
  38 codes can be read by libdmtx from one picture.  The bar code standard
  39 allow up to 2 KiB to be written in the tag.  There is another project
  40 with <a href="http://www.terryburton.co.uk/barcodewriter/">a bar code
  41 writer written in postscript</a> capable of creating such bar codes,
  42 but this was the first time I found a tool to read these bar
  43 codes.</p>
  44
  45 <p>It occurred to me that this could be used to tag and track the
  46 machines in our computing center.  If both racks and computers are
  47 tagged this way, we can use a picture of the rack and all its
  48 computers to detect the rack location of any computer in that rack.
  49 If we do this regularly for the entire room, we will find all
  50 locations, and can detect movements and removals.</p>
  51
  52 <p>I decided to test if this would work in practice, and picked a
  53 random rack and tagged all the machines with their names.  Next, I
  54 took pictures with my digital camera, and gave the dmtxread program
  55 these JPEG pictures to see how many tags it could read.  This worked
  56 fairly well.  If the pictures was well focused and not taken from the
  57 side, all tags in the image could be read.  Because of limited space
  58 between the racks, I was unable to get a good picture of the entire
  59 rack, but could without problem read all tags from a picture covering
  60 about half the rack.  I had to limit the search time used by dmtxread
  61 to 60000 ms to make sure it terminated in a reasonable time frame.</p>
  62
  63 <p>My conclusion is that this could work, and we should probably look
  64 at adjusting our computer tagging procedures to use bar codes for
  65 easier automatic tracking of computers.</p>
  66 </div>
  67
  68       <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/nuug">nuug</a>.</div>
  69
  70
  71     </div>
  72
  73
  74
  75
  76     <div id="sidebar">
  77
  78
  79
  80 <h2>Archive</h2>
  81 <ul>
  82
  83 <li>2023
  84 <ul>
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  86 <li><a href="https://people.skolelinux.org/pere/blog/archive/2023/01/">January (3)</a></li>
  87
  88 <li><a href="https://people.skolelinux.org/pere/blog/archive/2023/02/">February (1)</a></li>
  89
  90 </ul></li>
  91
  92 <li>2022
  93 <ul>
  94
  95 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/02/">February (1)</a></li>
  96
  97 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/03/">March (3)</a></li>
  98
  99 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/04/">April (2)</a></li>
 100
 101 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/06/">June (2)</a></li>
 102
 103 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/07/">July (1)</a></li>
 104
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 106
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 108
 109 <li><a href="https://people.skolelinux.org/pere/blog/archive/2022/12/">December (1)</a></li>
 110
 111 </ul></li>
 112
 113 <li>2021
 114 <ul>
 115
 116 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/01/">January (2)</a></li>
 117
 118 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/02/">February (1)</a></li>
 119
 120 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/05/">May (1)</a></li>
 121
 122 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/06/">June (1)</a></li>
 123
 124 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/07/">July (3)</a></li>
 125
 126 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/08/">August (1)</a></li>
 127
 128 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/09/">September (1)</a></li>
 129
 130 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/10/">October (1)</a></li>
 131
 132 <li><a href="https://people.skolelinux.org/pere/blog/archive/2021/12/">December (1)</a></li>
 133
 134 </ul></li>
 135
 136 <li>2020
 137 <ul>
 138
 139 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/02/">February (2)</a></li>
 140
 141 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/03/">March (2)</a></li>
 142
 143 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/04/">April (2)</a></li>
 144
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 146
 147 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/06/">June (2)</a></li>
 148
 149 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/07/">July (1)</a></li>
 150
 151 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/09/">September (1)</a></li>
 152
 153 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/10/">October (1)</a></li>
 154
 155 <li><a href="https://people.skolelinux.org/pere/blog/archive/2020/11/">November (1)</a></li>
 156
 157 </ul></li>
 158
 159 <li>2019
 160 <ul>
 161
 162 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/01/">January (4)</a></li>
 163
 164 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/02/">February (3)</a></li>
 165
 166 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/03/">March (3)</a></li>
 167
 168 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/05/">May (2)</a></li>
 169
 170 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/06/">June (5)</a></li>
 171
 172 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/07/">July (2)</a></li>
 173
 174 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/08/">August (1)</a></li>
 175
 176 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/09/">September (1)</a></li>
 177
 178 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/11/">November (1)</a></li>
 179
 180 <li><a href="https://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 181
 182 </ul></li>
 183
 184 <li>2018
 185 <ul>
 186
 187 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 188
 189 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 190
 191 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 192
 193 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 194
 195 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 196
 197 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 198
 199 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 200
 201 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 202
 203 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 204
 205 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 206
 207 <li><a href="https://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 208
 209 </ul></li>
 210
 211 <li>2017
 212 <ul>
 213
 214 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 215
 216 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 217
 218 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 219
 220 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 221
 222 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 223
 224 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 225
 226 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 227
 228 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 229
 230 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 231
 232 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 233
 234 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 235
 236 </ul></li>
 237
 238 <li>2016
 239 <ul>
 240
 241 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 242
 243 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 244
 245 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 246
 247 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 248
 249 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 250
 251 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 252
 253 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 254
 255 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 256
 257 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 258
 259 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 260
 261 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 262
 263 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 264
 265 </ul></li>
 266
 267 <li>2015
 268 <ul>
 269
 270 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 271
 272 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 273
 274 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 275
 276 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 277
 278 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 279
 280 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 281
 282 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 283
 284 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 285
 286 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 287
 288 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 289
 290 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 291
 292 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 293
 294 </ul></li>
 295
 296 <li>2014
 297 <ul>
 298
 299 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 300
 301 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 302
 303 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 304
 305 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 306
 307 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 308
 309 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 310
 311 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 312
 313 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 314
 315 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 316
 317 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 318
 319 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 320
 321 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 322
 323 </ul></li>
 324
 325 <li>2013
 326 <ul>
 327
 328 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 329
 330 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 331
 332 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 333
 334 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 335
 336 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 337
 338 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 339
 340 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 341
 342 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 343
 344 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 345
 346 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 347
 348 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 349
 350 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 351
 352 </ul></li>
 353
 354 <li>2012
 355 <ul>
 356
 357 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 358
 359 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 360
 361 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 362
 363 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 364
 365 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 366
 367 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 368
 369 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 370
 371 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 372
 373 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 374
 375 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 376
 377 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 378
 379 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 380
 381 </ul></li>
 382
 383 <li>2011
 384 <ul>
 385
 386 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 387
 388 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 389
 390 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 391
 392 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 393
 394 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 395
 396 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 397
 398 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 399
 400 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 401
 402 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 403
 404 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 405
 406 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 407
 408 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 409
 410 </ul></li>
 411
 412 <li>2010
 413 <ul>
 414
 415 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 416
 417 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 418
 419 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 420
 421 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 422
 423 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 424
 425 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 426
 427 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 428
 429 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 430
 431 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 432
 433 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 434
 435 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 436
 437 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 438
 439 </ul></li>
 440
 441 <li>2009
 442 <ul>
 443
 444 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 445
 446 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 447
 448 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 449
 450 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 451
 452 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 453
 454 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 455
 456 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 457
 458 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 459
 460 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 461
 462 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 463
 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 465
 466 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 467
 468 </ul></li>
 469
 470 <li>2008
 471 <ul>
 472
 473 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 474
 475 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 476
 477 </ul></li>
 478
 479 </ul>
 480
 481
 482
 483 <h2>Tags</h2>
 484 <ul>
 485
 486  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 487
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 621     </div>
 622     <p style="text-align: right">
 623  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 624 </p>
 625
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