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="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">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="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.</div>
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  80 <h2>Archive</h2>
  81 <ul>
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 162
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 166
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 168
 169 <li>2017
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 189
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 191
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 193
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 195
 196 <li>2016
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 218
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 220
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 222
 223 </ul></li>
 224
 225 <li>2015
 226 <ul>
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 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
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 241
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 243
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 245
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 247
 248 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 249
 250 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 251
 252 </ul></li>
 253
 254 <li>2014
 255 <ul>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 258
 259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 260
 261 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 262
 263 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 264
 265 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 266
 267 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 268
 269 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 270
 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 272
 273 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 274
 275 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 276
 277 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 278
 279 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 280
 281 </ul></li>
 282
 283 <li>2013
 284 <ul>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 289
 290 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 291
 292 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 303
 304 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 305
 306 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 307
 308 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 309
 310 </ul></li>
 311
 312 <li>2012
 313 <ul>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 318
 319 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 320
 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 326
 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 338
 339 </ul></li>
 340
 341 <li>2011
 342 <ul>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 347
 348 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 349
 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 367
 368 </ul></li>
 369
 370 <li>2010
 371 <ul>
 372
 373 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 374
 375 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 376
 377 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 378
 379 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 380
 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 394
 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 396
 397 </ul></li>
 398
 399 <li>2009
 400 <ul>
 401
 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 403
 404 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 405
 406 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 407
 408 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 409
 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 417
 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 423
 424 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 425
 426 </ul></li>
 427
 428 <li>2008
 429 <ul>
 430
 431 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 432
 433 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 434
 435 </ul></li>
 436
 437 </ul>
 438
 439
 440
 441 <h2>Tags</h2>
 442 <ul>
 443
 444  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 445
 446  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 447
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 449
 450  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 451
 452  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 453
 454  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 455
 456  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (175)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (28)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (424)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (22)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (22)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (316)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (197)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (38)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (70)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 563
 564  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
 565
 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (75)</a></li>
 567
 568  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 569
 570  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 571
 572 </ul>
 573
 574
 575     </div>
 576     <p style="text-align: right">
 577  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 578 </p>
 579
 580   </body>
 581 </html>