267:(RAID) exposes itself to the operating system as one logical disk while the array itself consists of several disks. The operating system either does not know that the hardware with which it is interfacing is a RAID, or knows but still does not concern itself with intricate details of storage. In case of the latter, specialized management, maintenance and diagnostics software dedicated to that specific RAID may run on the operating system.
33:
287:, a single disk drive would be directly attached to each system, managed as a single entity. As the development of drives continued, it became apparent that reliability was a problem and systems using RAID technology evolved, so that more than one physical disk is used to produce a single logical disk.
165:
because it does not actually exist as a single physical entity in its own right. The goal of the logical disk is to provide computer software with what seems a contiguous storage area, sparing them the burden of dealing with the intricacies of storing files on multiple physical units. Most modern
298:
devices in a network. A single RAID array may provide some capacity to one server, and some capacity to another. Therefore, logical disks are used to partition the available capacity and provide the amount of storage needed by each host from a common pool of logical disks. The
433:
306:
Today, the rationale for the logical disk approach starts to be questioned and solutions that offer more flexibility and better abstraction are increasingly needed.
468:
398:
426:
381:
349:
116:
526:
419:
200:
and assign each to one physical disk, more than one physical disk or part of the storage area of a physical disk. For example,
521:
54:
97:
50:
69:
76:
43:
300:
171:
490:
83:
463:
233:
442:
315:
291:
65:
244:
500:
475:
453:
295:
221:
191:
377:
371:
345:
205:
167:
458:
339:
225:
209:
90:
150:
515:
280:
495:
229:
217:
213:
32:
373:
Data Center
Storage: Cost-Effective Strategies, Implementation, and Management
294:
environments use a SAN. Here, many storage devices are connected to many host
201:
182:
Logical disks can be defined at various levels in the storage infrastructure.
154:
17:
411:
153:
that provides an area of usable storage capacity on one or more physical
284:
21:
485:
264:
16:"VDisk" and "vdisk" redirect here. For the RAM disk driver, see
415:
338:
Buyya, Rajkumar; Broberg, James; Goscinski, Andrzej M. (2010).
276:
26:
228:
in
Windows NT becomes one volume. Windows NT can also create
255:
s allow computer programs to access files stored on a SAN.
247:(SANs) consolidate inhomogeneous storage devices. As such
303:
uses the term "vdisk" to refer to these logical disks.
157:(s) in a computer system. The disk is described as
57:. Unsourced material may be challenged and removed.
399:"The LUN must DIE. Are you with me, storage bods?"
20:. For the World War II phonographic records, see
230:partitions that span multiple hard disks drives
212:, each of which a separate volume with its own
427:
8:
434:
420:
412:
341:Cloud Computing: Principles and Paradigms
117:Learn how and when to remove this message
327:
344:. John Wiley & Sons. p. 664.
7:
365:
363:
361:
333:
331:
265:redundant array of independent disks
55:adding citations to reliable sources
232:. Each volume is identified with a
14:
31:
190:An operating system may define
42:needs additional citations for
1:
543:
376:. CRC Press. p. 309.
15:
449:
301:IBM SAN Volume Controller
206:create several partitions
172:logical volume management
491:Software-defined storage
464:Distributed file systems
370:Smith, Hubbert (2011).
527:Storage virtualization
443:Storage virtualization
316:Storage virtualization
292:information technology
522:Computer data storage
397:The Register (2013).
290:Many modern business
245:Storage area networks
170:provide some form of
240:Storage area network
51:improve this article
501:Virtual file system
476:File virtualization
454:Block-level storage
279:first released the
283:drive in the 1956
222:optical disc drive
509:
508:
263:A hardware-level
259:Storage subsystem
218:floppy disk drive
168:operating systems
127:
126:
119:
101:
534:
459:Disk aggregation
436:
429:
422:
413:
403:
402:
394:
388:
387:
367:
356:
355:
335:
186:Operating system
149:for short) is a
122:
115:
111:
108:
102:
100:
59:
35:
27:
542:
541:
537:
536:
535:
533:
532:
531:
512:
511:
510:
505:
445:
440:
409:
407:
406:
396:
395:
391:
384:
369:
368:
359:
352:
337:
336:
329:
324:
312:
273:
261:
242:
226:USB flash drive
210:hard disk drive
188:
180:
123:
112:
106:
103:
60:
58:
48:
36:
25:
12:
11:
5:
540:
538:
530:
529:
524:
514:
513:
507:
506:
504:
503:
498:
493:
488:
483:
478:
473:
472:
471:
461:
456:
450:
447:
446:
441:
439:
438:
431:
424:
416:
405:
404:
389:
382:
357:
350:
326:
325:
323:
320:
319:
318:
311:
308:
272:
269:
260:
257:
241:
238:
187:
184:
179:
176:
151:virtual device
135:logical volume
125:
124:
66:"Logical disk"
39:
37:
30:
13:
10:
9:
6:
4:
3:
2:
539:
528:
525:
523:
520:
519:
517:
502:
499:
497:
494:
492:
489:
487:
484:
482:
479:
477:
474:
470:
467:
466:
465:
462:
460:
457:
455:
452:
451:
448:
444:
437:
432:
430:
425:
423:
418:
417:
414:
410:
400:
393:
390:
385:
383:9781466507814
379:
375:
374:
366:
364:
362:
358:
353:
351:9781118002209
347:
343:
342:
334:
332:
328:
321:
317:
314:
313:
309:
307:
304:
302:
297:
293:
288:
286:
282:
281:magnetic disk
278:
270:
268:
266:
258:
256:
254:
250:
246:
239:
237:
235:
231:
227:
223:
219:
215:
211:
207:
203:
199:
198:
197:logical disks
194:
185:
183:
177:
175:
173:
169:
164:
160:
156:
152:
148:
144:
140:
136:
132:
121:
118:
110:
99:
96:
92:
89:
85:
82:
78:
75:
71:
68: –
67:
63:
62:Find sources:
56:
52:
46:
45:
40:This article
38:
34:
29:
28:
23:
19:
496:Virtual disk
481:Logical disk
480:
408:
392:
372:
340:
305:
289:
274:
262:
252:
249:logical disk
248:
243:
234:drive letter
196:
192:
189:
181:
162:
158:
146:
142:
139:virtual disk
138:
134:
131:logical disk
130:
128:
113:
104:
94:
87:
80:
73:
61:
49:Please help
44:verification
41:
214:file system
516:Categories
469:Comparison
322:References
271:Motivation
202:Windows NT
155:disk drive
107:April 2014
77:newspapers
18:VDISK.SYS
310:See also
285:IBM 305
216:. Each
193:volumes
163:virtual
159:logical
91:scholar
380:
348:
296:server
178:Levels
93:
86:
79:
72:
64:
22:V-Disc
275:When
253:vdisk
251:s or
208:on a
147:vdisk
98:JSTOR
84:books
486:RAID
378:ISBN
346:ISBN
204:can
70:news
277:IBM
224:or
195:or
161:or
145:or
137:or
53:by
518::
360:^
330:^
236:.
220:,
174:.
143:VD
133:,
129:A
435:e
428:t
421:v
401:.
386:.
354:.
141:(
120:)
114:(
109:)
105:(
95:·
88:·
81:·
74:·
47:.
24:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
