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逻辑卷管理

分类： 服务器与存储

2015-09-08 21:22:38

LVM被称为逻辑卷管理，逻辑卷的出现解决了单一磁盘分区的存储空间动态添加的问题，同时这种动态扩展的方式能够解决不掉线更新的处理。逻辑卷的基本模型如下图所示：

关于逻辑卷的处理主要包括如下的几个概念：
PV是指实际的物理卷，但每个物理卷由一定数量的PE构成，PE通常为4M大小，因此PV的大小通常都是4M的整数倍。
VG是虚拟卷组，每个VG创建时由一系列的物理PV构成，实际上VG中是由所有PV中的PE构成，也VG也称为是PE池。
LV实际上是在VG之上的实现，LVM实际是从VG(PE池)中取出一定数量的PE构成逻辑卷，每个PE实际上只归属一个LVM。
由以上的分析可知，逻辑卷的实现实际上只是在实际磁盘和逻辑卷之间添加了一个中间层，通过中间层实现对物理资源的软件分配。逻辑卷的大小是可以调整的。但需要注意只是卷调整是无意义的，还要调整文件系统的大小。
     PV1 ... PVn
             |
            VG(实现对PV中PE资源的软件管理)
        /    |     \
 LV0     LV1    LV2
客户端使用LVM过程中并没有PV、PE、VG这些概念，对于客户端而言只有LVM。因此PV、VG、PE是逻辑卷内部的概念。关于逻辑卷的管理还是需要三步处理:
创建物理卷, 采用pvcreate创建，可通过pvdisplay查看pv的信息。
创建虚拟卷组，采用命令vgcreate创建，可通过vgdisplay查看vg的信息。
最后是创建逻辑卷，采用lvcreate创建，可通过lvdisplay查看逻辑卷的信息。

点击(此处)折叠或打开

  1. [root@Gong-Computer ~]# pvcreate /dev/sdd
  2. Physical volume "/dev/sdd" successfully created
  3. [root@Gong-Computer ~]# pvcreate /dev/sde
  4. Physical volume "/dev/sde" successfully created
  5. [root@Gong-Computer ~]# pvscan
  6. PV /dev/sdd lvm2 [8.00 GiB]
  7. PV /dev/sde lvm2 [8.00 GiB]
  8. Total: 2 [16.00 GiB] / in use: 0 [0 ] / in no VG: 2 [16.00 GiB]
  9. [root@Gong-Computer ~]# pvdisplay --没有添加到vg时无pe信息
  10. "/dev/sdd" is a new physical volume of "8.00 GiB"
  11. --- NEW Physical volume ---
  12. PV Name /dev/sdd
  13. VG Name
  14. PV Size 8.00 GiB
  15. Allocatable NO
  16. PE Size 0
  17. Total PE 0
  18. Free PE 0
  19. Allocated PE 0
  20. PV UUID Bxqi5f-aDvN-RaYW-CJQa-2PbH-VvMF-umrTAM
  22. "/dev/sde" is a new physical volume of "8.00 GiB"
  23. --- NEW Physical volume ---
  24. PV Name /dev/sde
  25. VG Name
  26. PV Size 8.00 GiB
  27. Allocatable NO
  28. PE Size 0
  29. Total PE 0
  30. Free PE 0
  31. Allocated PE 0
  32. PV UUID p00Ba0-iWBb-oVhZ-kwiy-yXEc-khNX-sKkazU
  33. [root@Gong-Computer ~]# vgcreate mylvmvg /dev/sdd /dev/sde --创建VG
  34. Volume group "mylvmvg" successfully created
  35. [root@Gong-Computer ~]# vgdisplay ---查看VG
  36. --- Volume group ---
  37. VG Name mylvmvg
  38. System ID
  39. Format lvm2
  40. Metadata Areas 2
  41. Metadata Sequence No 1
  42. VG Access read/write
  43. VG Status resizable
  44. MAX LV 0
  45. Cur LV 0
  46. Open LV 0
  47. Max PV 0
  48. Cur PV 2
  49. Act PV 2
  50. VG Size 15.99 GiB
  51. PE Size 4.00 MiB
  52. Total PE 4094
  53. Alloc PE / Size 0 / 0
  54. Free PE / Size 4094 / 15.99 GiB
  55. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  57. [root@Gong-Computer ~]# pvdisplay
  58. --- Physical volume ---
  59. PV Name /dev/sdd
  60. VG Name mylvmvg
  61. PV Size 8.00 GiB / not usable 4.00 MiB
  62. Allocatable yes
  63. PE Size 4.00 MiB
  64. Total PE 2047 ----添加到VG后，存在PE的信息
  65. Free PE 2047
  66. Allocated PE 0
  67. PV UUID Bxqi5f-aDvN-RaYW-CJQa-2PbH-VvMF-umrTAM
  69. --- Physical volume ---
  70. PV Name /dev/sde
  71. VG Name mylvmvg
  72. PV Size 8.00 GiB / not usable 4.00 MiB
  73. Allocatable yes
  74. PE Size 4.00 MiB
  75. Total PE 2047
  76. Free PE 2047
  77. Allocated PE 0
  78. PV UUID p00Ba0-iWBb-oVhZ-kwiy-yXEc-khNX-sKkazU
  79. [root@Gong-Computer ~]# lvcreate -L 2G mylvmvg ---创建逻辑卷
  80. Logical volume "lvol0" created
  81. [root@Gong-Computer ~]# lvcreate -L 2G mylvmvg
  82. Logical volume "lvol1" created
  83. [root@Gong-Computer ~]# lvcreate -L 2G mylvmvg
  84. Logical volume "lvol2" created
  85. [root@Gong-Computer ~]# lvdisplay
  86. --- Logical volume ---
  87. LV Name /dev/mylvmvg/lvol0
  88. VG Name mylvmvg
  89. LV UUID 5EmUJa-E4QB-OcQ6-uAuE-QXls-0dYQ-1OfZjm
  90. LV Write Access read/write
  91. LV Status available
  92. # open 1
  93. LV Size 2.00 GiB
  94. Current LE 512
  95. Segments 1
  96. Allocation inherit
  97. Read ahead sectors auto
  98. - currently set to 256
  99. Block device 253:0
  101. --- Logical volume ---
  102. LV Name /dev/mylvmvg/lvol1
  103. VG Name mylvmvg
  104. LV UUID ZEC6l3-y6GT-xRVf-8I7T-z7v3-KEgu-6yHsPS
  105. LV Write Access read/write
  106. LV Status available
  107. # open 0
  108. LV Size 2.00 GiB
  109. Current LE 512
  110. Segments 1
  111. Allocation inherit
  112. Read ahead sectors auto
  113. - currently set to 256
  114. Block device 253:1
  116. --- Logical volume ---
  117. LV Name /dev/mylvmvg/lvol2
  118. VG Name mylvmvg
  119. LV UUID xk1AMT-iHEj-TnLB-DLD0-AIoD-BSQa-NXZ7UV
  120. LV Write Access read/write
  121. LV Status available
  122. # open 0
  123. LV Size 2.00 GiB
  124. Current LE 512
  125. Segments 1
  126. Allocation inherit
  127. Read ahead sectors auto
  128. - currently set to 256
  129. Block device 253:2
  131. [root@Gong-Computer ~]# ll /dev/mylvmvg/ --新创建的卷是一个软连接对象
  132. total 0
  133. lrwxrwxrwx 1 root root 7 Sep 7 22:48 lvol0 -> ../dm-0
  134. lrwxrwxrwx 1 root root 7 Sep 7 23:03 lvol1 -> ../dm-1
  135. lrwxrwxrwx 1 root root 7 Sep 7 23:03 lvol2 -> ../dm-2
  136. [root@Gong-Computer ~]# ll /dev/d
  137. [root@Gong-Computer ~]# mkfs.ext3 /dev/mylvmvg/lvol0 ---格式化创建好的逻辑卷，格式化之后可以进行逻辑卷的使用
  138. mke2fs 1.41.12 (17-May-2010)
  139. Filesystem label=
  140. OS type: Linux
  141. Block size=4096 (log=2)
  142. Fragment size=4096 (log=2)
  143. Stride=0 blocks, Stripe width=0 blocks
  144. 131072 inodes, 524288 blocks
  145. 26214 blocks (5.00%) reserved for the super user
  146. First data block=0
  147. Maximum filesystem blocks=536870912
  148. 16 block groups
  149. 32768 blocks per group, 32768 fragments per group
  150. 8192 inodes per group
  151. Superblock backups stored on blocks:
  152. 32768, 98304, 163840, 229376, 294912
  154. Writing inode tables: done
  155. Creating journal (16384 blocks): done
  156. Writing superblocks and filesystem accounting information: done
  158. This filesystem will be automatically checked every 27 mounts or
  159. 180 days, whichever comes first. Use tune2fs -c or -i to override.
  160. [root@Gong-Computer ~]# mount /dev/mylvmvg/lvol0 /mnt/nfs/ ----挂载文件
  161. [root@Gong-Computer ~]# ll /mnt/nfs/
  162. total 16
  163. drwx------ 2 root root 16384 Sep 7 22:48 lost+found
  164. [root@Gong-Computer ~]# lvextend -L +1G /dev/mylvmvg/lvol0 ---扩展逻辑卷大小
  165. Extending logical volume lvol0 to 3.00 GiB
  166. Logical volume lvol0 successfully resized
  167. [root@Gong-Computer ~]# resize2fs -f /dev/mylvmvg/lvol0 ---调整文件系统的大小
  168. resize2fs 1.41.12 (17-May-2010)
  169. Resizing the filesystem on /dev/mylvmvg/lvol0 to 786432 (4k) blocks.
  170. The filesystem on /dev/mylvmvg/lvol0 is now 786432 blocks long.
  171. [root@Gong-Computer ~]# lvextend -L +1G /dev/mylvmvg/lvol0
  172. Extending logical volume lvol0 to 4.00 GiB
  173. Logical volume lvol0 successfully resized
  174. [root@Gong-Computer ~]# resize2fs -f /dev/mylvmvg/lvol0
  175. resize2fs 1.41.12 (17-May-2010)
  176. Filesystem at /dev/mylvmvg/lvol0 is mounted on /mnt/nfs; on-line resizing required
  177. old desc_blocks = 1, new_desc_blocks = 1
  178. Performing an on-line resize of /dev/mylvmvg/lvol0 to 1048576 (4k) blocks.
  179. The filesystem on /dev/mylvmvg/lvol0 is now 1048576 blocks long.
  181. [root@Gong-Computer ~]# df
  182. Filesystem 1K-blocks Used Available Use% Mounted on
  183. /dev/sda1 20158332 2937880 16196452 16% /
  184. tmpfs 177736 272 177464 1% /dev/shm
  185. /dev/sda2 15118728 9544700 4806028 67% /opt
  186. /dev/sda5 14262192 9214364 4323348 69% /usr
  187. /dev/sdb1 2086912 32928 2053984 2% /mnt/sdb1
  188. /dev/sdb2 2064208 3072 1956280 1% /mnt/sdb2
  189. /dev/sdc1 3844848 73244 3576296 3% /mnt/sdc1
  190. /dev/sdc2 1942528 32928 1909600 2% /mnt/sdc2
  191. .host:/ 252926972 119266328 133660644 48% /mnt/hgfs
  192. /dev/mapper/mylvmvg-lvol0
  193. 4128448 69692 3849056 2% /mnt/nfs ---实际的逻辑卷文件
  194. [root@Gong-Computer ~]# vgdisplay
  195. --- Volume group ---
  196. VG Name mylvmvg
  197. System ID
  198. Format lvm2
  199. Metadata Areas 2
  200. Metadata Sequence No 6
  201. VG Access read/write
  202. VG Status resizable
  203. MAX LV 0
  204. Cur LV 3
  205. Open LV 1
  206. Max PV 0
  207. Cur PV 2
  208. Act PV 2
  209. VG Size 15.99 GiB
  210. PE Size 4.00 MiB
  211. Total PE 4094
  212. Alloc PE / Size 2048 / 8.00 GiB
  213. Free PE / Size 2046 / 7.99 GiB
  214. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  216. [root@Gong-Computer ~]#
  217. [root@Gong-Computer ~]#
  218. [root@Gong-Computer ~]# lvextend -L +2G /dev/mylvmvg/lvol0 ---改变了卷的大小
  219. Extending logical volume lvol0 to 6.00 GiB
  220. Logical volume lvol0 successfully resized
  221. [root@Gong-Computer ~]# df ---文件系统的大小未改变
  222. Filesystem 1K-blocks Used Available Use% Mounted on
  223. /dev/sda1 20158332 2937884 16196448 16% /
  224. tmpfs 177736 272 177464 1% /dev/shm
  225. /dev/sda2 15118728 9544700 4806028 67% /opt
  226. /dev/sda5 14262192 9214364 4323348 69% /usr
  227. /dev/sdb1 2086912 32928 2053984 2% /mnt/sdb1
  228. /dev/sdb2 2064208 3072 1956280 1% /mnt/sdb2
  229. /dev/sdc1 3844848 73244 3576296 3% /mnt/sdc1
  230. /dev/sdc2 1942528 32928 1909600 2% /mnt/sdc2
  231. .host:/ 252926972 119266328 133660644 48% /mnt/hgfs
  232. /dev/mapper/mylvmvg-lvol0
  233. 4128448 69692 3849056 2% /mnt/nfs
  234. [root@Gong-Computer ~]# resize2fs -f /dev/mylvmvg/lvol0 ---更改文件系统的大小
  235. resize2fs 1.41.12 (17-May-2010)
  236. Filesystem at /dev/mylvmvg/lvol0 is mounted on /mnt/nfs; on-line resizing required
  237. old desc_blocks = 1, new_desc_blocks = 1
  238. Performing an on-line resize of /dev/mylvmvg/lvol0 to 1572864 (4k) blocks.
  239. The filesystem on /dev/mylvmvg/lvol0 is now 1572864 blocks long.
  240. [root@Gong-Computer ~]# pvcreate /dev/sdf --- 创建新的pv
  241. Physical volume "/dev/sdf" successfully created
  242. [root@Gong-Computer ~]# vgextend mylvmvg /dev/sdf ---扩展vg
  243. Volume group "mylvmvg" successfully extended
  244. [root@Gong-Computer ~]# vgdisplay
  245. --- Volume group ---
  246. VG Name mylvmvg
  247. System ID
  248. Format lvm2
  249. Metadata Areas 3
  250. Metadata Sequence No 8
  251. VG Access read/write
  252. VG Status resizable
  253. MAX LV 0
  254. Cur LV 3
  255. Open LV 1
  256. Max PV 0
  257. Cur PV 3
  258. Act PV 3
  259. VG Size 23.99 GiB
  260. PE Size 4.00 MiB
  261. Total PE 6141
  262. Alloc PE / Size 2560 / 10.00 GiB
  263. Free PE / Size 3581 / 13.99 GiB
  264. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  266. [root@Gong-Computer ~]# lvextend -L +2G /dev/mylvmvg/lvol0
  267. Extending logical volume lvol0 to 8.00 GiB
  268. Logical volume lvol0 successfully resized
  269. [root@Gong-Computer ~]# resize2fs -f /dev/mylvmvg/lvol0
  270. resize2fs 1.41.12 (17-May-2010)
  271. Filesystem at /dev/mylvmvg/lvol0 is mounted on /mnt/nfs; on-line resizing required
  272. old desc_blocks = 1, new_desc_blocks = 1
  273. Performing an on-line resize of /dev/mylvmvg/lvol0 to 2097152 (4k) blocks.
  274. The filesystem on /dev/mylvmvg/lvol0 is now 2097152 blocks long.
  275. [root@Gong-Computer ~]# df
  276. Filesystem 1K-blocks Used Available Use% Mounted on
  277. /dev/sda1 20158332 2937892 16196440 16% /
  278. tmpfs 177736 272 177464 1% /dev/shm
  279. /dev/sda2 15118728 9544700 4806028 67% /opt
  280. /dev/sda5 14262192 9214364 4323348 69% /usr
  281. /dev/sdb1 2086912 32928 2053984 2% /mnt/sdb1
  282. /dev/sdb2 2064208 3072 1956280 1% /mnt/sdb2
  283. /dev/sdc1 3844848 73244 3576296 3% /mnt/sdc1
  284. /dev/sdc2 1942528 32928 1909600 2% /mnt/sdc2
  285. .host:/ 252926972 119274456 133652516 48% /mnt/hgfs
  286. /dev/mapper/mylvmvg-lvol0
  287. 8256952 70200 7767388 1% /mnt/nfs
  288. [root@Gong-Computer ~]#
  289. [root@Gong-Computer ~]# vgdisplay
  290. --- Volume group ---
  291. VG Name mylvmvg
  292. System ID
  293. Format lvm2
  294. Metadata Areas 3
  295. Metadata Sequence No 9
  296. VG Access read/write
  297. VG Status resizable
  298. MAX LV 0
  299. Cur LV 3
  300. Open LV 1
  301. Max PV 0
  302. Cur PV 3
  303. Act PV 3
  304. VG Size 23.99 GiB
  305. PE Size 4.00 MiB
  306. Total PE 6141
  307. Alloc PE / Size 3072 / 12.00 GiB
  308. Free PE / Size 3069 / 11.99 GiB
  309. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  311. [root@Gong-Computer ~]# lvdisplay
  312. --- Logical volume ---
  313. LV Name /dev/mylvmvg/lvol0
  314. VG Name mylvmvg
  315. LV UUID 5EmUJa-E4QB-OcQ6-uAuE-QXls-0dYQ-1OfZjm
  316. LV Write Access read/write
  317. LV Status available
  318. # open 1
  319. LV Size 8.00 GiB
  320. Current LE 2048
  321. Segments 3
  322. Allocation inherit
  323. Read ahead sectors auto
  324. - currently set to 256
  325. Block device 253:0
  327. --- Logical volume ---
  328. LV Name /dev/mylvmvg/lvol1
  329. VG Name mylvmvg
  330. LV UUID ZEC6l3-y6GT-xRVf-8I7T-z7v3-KEgu-6yHsPS
  331. LV Write Access read/write
  332. LV Status available
  333. # open 0
  334. LV Size 2.00 GiB
  335. Current LE 512
  336. Segments 1
  337. Allocation inherit
  338. Read ahead sectors auto
  339. - currently set to 256
  340. Block device 253:1
  342. --- Logical volume ---
  343. LV Name /dev/mylvmvg/lvol2
  344. VG Name mylvmvg
  345. LV UUID xk1AMT-iHEj-TnLB-DLD0-AIoD-BSQa-NXZ7UV
  346. LV Write Access read/write
  347. LV Status available
  348. # open 0
  349. LV Size 2.00 GiB
  350. Current LE 512
  351. Segments 1
  352. Allocation inherit
  353. Read ahead sectors auto
  354. - currently set to 256
  355. Block device 253:2
  357. [root@Gong-Computer ~]# pvdisplay
  358. --- Physical volume ---
  359. PV Name /dev/sdd
  360. VG Name mylvmvg
  361. PV Size 8.00 GiB / not usable 4.00 MiB
  362. Allocatable yes (but full)
  363. PE Size 4.00 MiB
  364. Total PE 2047
  365. Free PE 0
  366. Allocated PE 2047
  367. PV UUID Bxqi5f-aDvN-RaYW-CJQa-2PbH-VvMF-umrTAM
  369. --- Physical volume ---
  370. PV Name /dev/sde
  371. VG Name mylvmvg
  372. PV Size 8.00 GiB / not usable 4.00 MiB
  373. Allocatable yes
  374. PE Size 4.00 MiB
  375. Total PE 2047
  376. Free PE 1022
  377. Allocated PE 1025
  378. PV UUID p00Ba0-iWBb-oVhZ-kwiy-yXEc-khNX-sKkazU
  380. --- Physical volume ---
  381. PV Name /dev/sdf
  382. VG Name mylvmvg
  383. PV Size 8.00 GiB / not usable 4.00 MiB
  384. Allocatable yes
  385. PE Size 4.00 MiB
  386. Total PE 2047
  387. Free PE 2047
  388. Allocated PE 0
  389. PV UUID lh0ZmH-5pta-2k2c-DqyR-r3D5-MLbA-fyfF2j
  390. 通过上述的操作就实现了逻辑卷的管理，实现了文件系统的动态扩展，这是磁盘分区无法完成的任务。
  392. 删除逻辑卷的处理按照相反的操作进行。
  393. [root@Gong-Computer ~]# umount /mnt/nfs/
  394. [root@Gong-Computer ~]# lvremove /dev/mylvmvg/lvol0 --删除逻辑卷
  395. Can't remove open logical volume "lvol0"
  396. [root@Gong-Computer ~]# lvremove /dev/mylvmvg/lvol0
  397. Do you really want to remove active logical volume lvol0? [y/n]: y
  398. Logical volume "lvol0" successfully removed
  399. [root@Gong-Computer ~]#
  400. [root@Gong-Computer ~]# lvremove /dev/mylvmvg/lvol1
  401. Can't remove open logical volume "lvol1"
  402. [root@Gong-Computer ~]# lvremove /dev/mylvmvg/lvol2
  403. Do you really want to remove active logical volume lvol2? [y/n]: y
  404. Logical volume "lvol2" successfully removed
  405. [root@Gong-Computer ~]# vgreduce mylvmvg /dev/sdf ---减少vg中的pv
  406. Removed "/dev/sdf" from volume group "mylvmvg"
  407. [root@Gong-Computer ~]# vgscan
  408. Reading all physical volumes. This may take a while...
  409. Found volume group "mylvmvg" using metadata type lvm2
  410. [root@Gong-Computer ~]# vgdisplay
  411. --- Volume group ---
  412. VG Name mylvmvg
  413. System ID
  414. Format lvm2
  415. Metadata Areas 2
  416. Metadata Sequence No 12
  417. VG Access read/write
  418. VG Status resizable
  419. MAX LV 0
  420. Cur LV 1
  421. Open LV 0
  422. Max PV 0
  423. Cur PV 2
  424. Act PV 2
  425. VG Size 15.99 GiB
  426. PE Size 4.00 MiB
  427. Total PE 4094
  428. Alloc PE / Size 512 / 2.00 GiB
  429. Free PE / Size 3582 / 13.99 GiB
  430. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  431. [root@Gong-Computer ~]# pvremove /dev/sdf --删除pv
  432. Labels on physical volume "/dev/sdf" successfully wiped
  433. [root@Gong-Computer ~]# pvdisplay
  434. --- Physical volume ---
  435. PV Name /dev/sdd
  436. VG Name mylvmvg
  437. PV Size 8.00 GiB / not usable 4.00 MiB
  438. Allocatable yes
  439. PE Size 4.00 MiB
  440. Total PE 2047
  441. Free PE 1535
  442. Allocated PE 512
  443. PV UUID Bxqi5f-aDvN-RaYW-CJQa-2PbH-VvMF-umrTAM
  445. --- Physical volume ---
  446. PV Name /dev/sde
  447. VG Name mylvmvg
  448. PV Size 8.00 GiB / not usable 4.00 MiB
  449. Allocatable yes
  450. PE Size 4.00 MiB
  451. Total PE 2047
  452. Free PE 2047
  453. Allocated PE 0
  454. PV UUID p00Ba0-iWBb-oVhZ-kwiy-yXEc-khNX-sKkazU
  456. [root@Gong-Computer ~]# vgdisplay
  457. --- Volume group ---
  458. VG Name mylvmvg
  459. System ID
  460. Format lvm2
  461. Metadata Areas 2
  462. Metadata Sequence No 12
  463. VG Access read/write
  464. VG Status resizable
  465. MAX LV 0
  466. Cur LV 1
  467. Open LV 0
  468. Max PV 0
  469. Cur PV 2
  470. Act PV 2
  471. VG Size 15.99 GiB
  472. PE Size 4.00 MiB
  473. Total PE 4094
  474. Alloc PE / Size 512 / 2.00 GiB
  475. Free PE / Size 3582 / 13.99 GiB
  476. VG UUID T11gb0-MYs3-Yvym-4bVz-8ABy-8DlF-H1hS3V
  478. [root@Gong-Computer ~]# lvdisplay
  479. --- Logical volume ---
  480. LV Name /dev/mylvmvg/lvol1
  481. VG Name mylvmvg
  482. LV UUID ZEC6l3-y6GT-xRVf-8I7T-z7v3-KEgu-6yHsPS
  483. LV Write Access read/write
  484. LV Status available
  485. # open 0
  486. LV Size 2.00 GiB
  487. Current LE 512
  488. Segments 1
  489. Allocation inherit
  490. Read ahead sectors auto
  491. - currently set to 256
  492. Block device 253:1
  494. [root@Gong-Computer ~]#
  495. [root@Gong-Computer ~]# vgreduce mylvmvg /dev/sde
  496. Removed "/dev/sde" from volume group "mylvmvg"
  497. [root@Gong-Computer ~]#
  498. [root@Gong-Computer ~]# pvremove /dev/sde
  499. Labels on physical volume "/dev/sde" successfully wiped
  500. [root@Gong-Computer ~]# vgremove mylvmvg
  501. Do you really want to remove volume group "mylvmvg" containing 1 logical volumes? [y/n]: y
  502. Do you really want to remove active logical volume lvol1? [y/n]: y
  503. Logical volume "lvol1" successfully removed
  504. Volume group "mylvmvg" successfully removed
  505. [root@Gong-Computer ~]# pvremove /dev/sdd
  506. Labels on physical volume "/dev/sdd" successfully wiped
  507. [root@Gong-Computer ~]#
通过逻辑卷的处理能较好的实现磁盘的动态扩展，相比传统的分区磁盘管理要方便不少。
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