blog/tags/raid/index.html

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  13  <h1>
  14      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  15
  16  </h1>
  17
  18 </div>
  19
  20
  21     <h3>Entries tagged "raid".</h3>
  22
  23     <div class="entry">
  24       <div class="title">
  25         <a href="http://people.skolelinux.org/pere/blog/Some_notes_on_fault_tolerant_storage_systems.html">Some notes on fault tolerant storage systems</a>
  26       </div>
  27       <div class="date">
  28          1st November 2017
  29       </div>
  30       <div class="body">
  31         <p>If you care about how fault tolerant your storage is, you might
  32 find these articles and papers interesting.  They have formed how I
  33 think of when designing a storage system.</p>
  34
  35 <ul>
  36
  37 <li>USENIX :login; <a
  38 href="https://www.usenix.org/publications/login/summer2017/ganesan">Redundancy
  39 Does Not Imply Fault Tolerance.  Analysis of Distributed Storage
  40 Reactions to Single Errors and Corruptions</a> by Aishwarya Ganesan,
  41 Ramnatthan Alagappan, Andrea C. Arpaci-Dusseau, and Remzi
  42 H. Arpaci-Dusseau</li>
  43
  44 <li>ZDNet
  45 <a href="http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/">Why
  46 RAID 5 stops working in 2009</a> by Robin Harris</li>
  47
  48 <li>ZDNet
  49 <a href="http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/">Why
  50 RAID 6 stops working in 2019</a> by Robin Harris</li>
  51
  52 <li>USENIX FAST'07
  53 <a href="http://research.google.com/archive/disk_failures.pdf">Failure
  54 Trends in a Large Disk Drive Population</a> by Eduardo Pinheiro,
  55 Wolf-Dietrich Weber and Luiz André Barroso</li>
  56
  57 <li>USENIX ;login: <a
  58 href="https://www.usenix.org/system/files/login/articles/hughes12-04.pdf">Data
  59 Integrity.  Finding Truth in a World of Guesses and Lies</a> by Doug
  60 Hughes</li>
  61
  62 <li>USENIX FAST'08
  63 <a href="https://www.usenix.org/events/fast08/tech/full_papers/bairavasundaram/bairavasundaram_html/">An
  64 Analysis of Data Corruption in the Storage Stack</a> by
  65 L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C.
  66 Arpaci-Dusseau, and R. H. Arpaci-Dusseau</li>
  67
  68 <li>USENIX FAST'07 <a
  69 href="https://www.usenix.org/legacy/events/fast07/tech/schroeder/schroeder_html/">Disk
  70 failures in the real world: what does an MTTF of 1,000,000 hours mean
  71 to you?</a> by B. Schroeder and G. A. Gibson.</li>
  72
  73 <li>USENIX ;login: <a
  74 href="https://www.usenix.org/events/fast08/tech/full_papers/jiang/jiang_html/">Are
  75 Disks the Dominant Contributor for Storage Failures?  A Comprehensive
  76 Study of Storage Subsystem Failure Characteristics</a> by Weihang
  77 Jiang, Chongfeng Hu, Yuanyuan Zhou, and Arkady Kanevsky</li>
  78
  79 <li>SIGMETRICS 2007
  80 <a href="http://research.cs.wisc.edu/adsl/Publications/latent-sigmetrics07.pdf">An
  81 analysis of latent sector errors in disk drives</a> by
  82 L. N. Bairavasundaram, G. R. Goodson, S. Pasupathy, and J. Schindler</li>
  83
  84 </ul>
  85
  86 <p>Several of these research papers are based on data collected from
  87 hundred thousands or millions of disk, and their findings are eye
  88 opening.  The short story is simply do not implicitly trust RAID or
  89 redundant storage systems.  Details matter.  And unfortunately there
  90 are few options on Linux addressing all the identified issues.  Both
  91 ZFS and Btrfs are doing a fairly good job, but have legal and
  92 practical issues on their own.  I wonder how cluster file systems like
  93 Ceph do in this regard.  After all, there is an old saying, you know
  94 you have a distributed system when the crash of a computer you have
  95 never heard of stops you from getting any work done.  The same holds
  96 true if fault tolerance do not work.</p>
  97
  98 <p>Just remember, in the end, it do not matter how redundant, or how
  99 fault tolerant your storage is, if you do not continuously monitor its
 100 status to detect and replace failed disks.</p>
 101
 102 <p>As usual, if you use Bitcoin and want to show your support of my
 103 activities, please send Bitcoin donations to my address
 104 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 105
 106       </div>
 107       <div class="tags">
 108
 109
 110         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>.
 111
 112
 113       </div>
 114     </div>
 115     <div class="padding"></div>
 116
 117     <div class="entry">
 118       <div class="title">
 119         <a href="http://people.skolelinux.org/pere/blog/How_to_figure_out_which_RAID_disk_to_replace_when_it_fail.html">How to figure out which RAID disk to replace when it fail</a>
 120       </div>
 121       <div class="date">
 122         14th February 2012
 123       </div>
 124       <div class="body">
 125         <p>Once in a while my home server have disk problems.  Thanks to Linux
 126 Software RAID, I have not lost data yet (but
 127 <a href="http://comments.gmane.org/gmane.linux.raid/34532">I was
 128 close</a> this summer :).  But once a disk is starting to behave
 129 funny, a practical problem present itself.  How to get from the Linux
 130 device name (like /dev/sdd) to something that can be used to identify
 131 the disk when the computer is turned off?  In my case I have SATA
 132 disks with a unique ID printed on the label.  All I need is a way to
 133 figure out how to query the disk to get the ID out.</p>
 134
 135 <p>After fumbling a bit, I
 136 <a href="http://www.cyberciti.biz/faq/linux-getting-scsi-ide-harddisk-information/">found
 137 that hdparm -I</a> will report the disk serial number, which is
 138 printed on the disk label.  The following (almost) one-liner can be
 139 used to look up the ID of all the failed disks:</p>
 140
 141 <blockquote><pre>
 142 for d in $(cat /proc/mdstat |grep '(F)'|tr ' ' "\n"|grep '(F)'|cut -d\[ -f1|sort -u);
 143 do
 144     printf "Failed disk $d: "
 145     hdparm -I /dev/$d |grep 'Serial Num'
 146 done
 147 </blockquote></pre>
 148
 149 <p>Putting it here to make sure I do not have to search for it the
 150 next time, and in case other find it useful.</p>
 151
 152 <p>At the moment I have two failing disk. :(</p>
 153
 154 <blockquote><pre>
 155 Failed disk sdd1:       Serial Number:      WD-WCASJ1860823
 156 Failed disk sdd2:       Serial Number:      WD-WCASJ1860823
 157 Failed disk sde2:       Serial Number:      WD-WCASJ1840589
 158 </blockquote></pre>
 159
 160 <p>The last time I had failing disks, I added the serial number on
 161 labels I printed and stuck on the short sides of each disk, to be able
 162 to figure out which disk to take out of the box without having to
 163 remove each disk to look at the physical vendor label.  The vendor
 164 label is at the top of the disk, which is hidden when the disks are
 165 mounted inside my box.</p>
 166
 167 <p>I really wish the check_linux_raid Nagios plugin for checking Linux
 168 Software RAID in the
 169 <a href="http://packages.qa.debian.org/n/nagios-plugins.html">nagios-plugins-standard</a>
 170 debian package would look up this value automatically, as it would
 171 make the plugin a lot more useful when my disks fail.  At the moment
 172 it only report a failure when there are no more spares left (it really
 173 should warn as soon as a disk is failing), and it do not tell me which
 174 disk(s) is failing when the RAID is running short on disks.</p>
 175
 176       </div>
 177       <div class="tags">
 178
 179
 180         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>.
 181
 182
 183       </div>
 184     </div>
 185     <div class="padding"></div>
 186
 187     <p style="text-align: right;"><a href="raid.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
 188     <div id="sidebar">
 189
 190
 191
 192 <h2>Archive</h2>
 193 <ul>
 194
 195 <li>2017
 196 <ul>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 205
 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 219
 220 </ul></li>
 221
 222 <li>2016
 223 <ul>
 224
 225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 248
 249 </ul></li>
 250
 251 <li>2015
 252 <ul>
 253
 254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 277
 278 </ul></li>
 279
 280 <li>2014
 281 <ul>
 282
 283 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 306
 307 </ul></li>
 308
 309 <li>2013
 310 <ul>
 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 335
 336 </ul></li>
 337
 338 <li>2012
 339 <ul>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 364
 365 </ul></li>
 366
 367 <li>2011
 368 <ul>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 385
 386 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 387
 388 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 389
 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 391
 392 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 393
 394 </ul></li>
 395
 396 <li>2010
 397 <ul>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 414
 415 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 416
 417 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 420
 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 422
 423 </ul></li>
 424
 425 <li>2009
 426 <ul>
 427
 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 439
 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 441
 442 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 443
 444 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 445
 446 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 447
 448 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 449
 450 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 451
 452 </ul></li>
 453
 454 <li>2008
 455 <ul>
 456
 457 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 458
 459 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 460
 461 </ul></li>
 462
 463 </ul>
 464
 465
 466
 467 <h2>Tags</h2>
 468 <ul>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (15)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (155)</a></li>
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 497
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 531
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 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
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 563
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 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 567
 568  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
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 571
 572  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
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 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 579
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 581
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 583
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 588  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 589
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 591
 592 </ul>
 593
 594
 595     </div>
 596     <p style="text-align: right">
 597  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 598 </p>
 599
 600   </body>
 601 </html>