逻辑卷管理-白红宇

逻辑卷管理

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发布时间：2019-06-13

本文共 8299 字，大约阅读时间需要 27 分钟。

线上服务器磁盘资源不够用了，有没有，苦恼！！！

把磁盘相互挂载，，不好用有土鳖。。让那帮死开发瞧不起。

还好你来了。。。LVM逻辑卷管理：lvm的构成如下图

PV:是物理的磁盘分区

VG:LVM中的物理的磁盘分区，也就是PV，必须加入VG，可以将VG理解为一个仓库或者是几个大的硬盘。

LV：也就是从VG中划分的逻辑分区

线上的资源环境是这样的：

[admin@56_74 ~]# df -ThFilesystem    Type    Size  Used Avail Use% Mounted on/dev/sda1     ext3    9.9G  1.6G  7.8G  17% //dev/sda3     ext3     20G  240M   19G   2% /usr/local/dev/sda4     ext3    103G  132M   98G   1% /datatmpfs        tmpfs     16G   32K   16G   1% /dev/shm/dev/sdb1     ext3    134G  129M  128G   1% /data1

/data 和/data1 各一百多G，看着愁人啊~~~能合并使用就好了，不是吗？

第一步，umount /data 和/data1的磁盘，并注释fstab的磁盘信息，不然小心kernel 恐慌。。。哈哈

第二步，变更/dev/sda4和/data/sdb1的磁盘类型

先搞/data/sdb1 [admin@56_74 ~]# fdisk /dev/sdbWARNING: DOS-compatible mode is deprecated. It's strongly recommended to         switch off the mode (command 'c') and change display units to         sectors (command 'u').Command (m for help): pDisk /dev/sdb: 146.2 GB, 146163105792 bytes255 heads, 63 sectors/track, 17769 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1       17769   142729461   83  LinuxCommand (m for help): tSelected partition 1Hex code (type L to list codes): L 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris         1  FAT12           39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT- 2  XENIX root      3c  PartitionMagic  83  Linux           c4  DRDOS/sec (FAT- 3  XENIX usr       40  Venix 80286     84  OS/2 hidden C:  c6  DRDOS/sec (FAT- 4  FAT16 <32M      41  PPC PReP Boot   85  Linux extended  c7  Syrinx          5  Extended        42  SFS             86  NTFS volume set da  Non-FS data     6  FAT16           4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / . 7  HPFS/NTFS       4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility    8  AIX             4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt          9  AIX bootable    50  OnTrack DM      93  Amoeba          e1  DOS access      a  OS/2 Boot Manag 51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O         b  W95 FAT32       52  CP/M            9f  BSD/OS          e4  SpeedStor       c  W95 FAT32 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs         e  W95 FAT16 (LBA) 54  OnTrackDM6      a5  FreeBSD         ee  GPT             f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD         ef  EFI (FAT-12/16/10  OPUS            56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b11  Hidden FAT12    5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor      12  Compaq diagnost 61  SpeedStor       a9  NetBSD          f4  SpeedStor      14  Hidden FAT16 <3 63  GNU HURD or Sys ab  Darwin boot     f2  DOS secondary  16  Hidden FAT16    64  Novell Netware  af  HFS / HFS+      fb  VMware VMFS    17  Hidden HPFS/NTF 65  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE 18  AST SmartSleep  70  DiskSecure Mult b8  BSDI swap       fd  Linux raid auto1b  Hidden W95 FAT3 75  PC/IX           bb  Boot Wizard hid fe  LANstep        1c  Hidden W95 FAT3 80  Old Minix       be  Solaris boot    ff  BBT            1e  Hidden W95 FAT1Hex code (type L to list codes): 8eChanged system type of partition 1 to 8e (Linux LVM)Command (m for help): pDisk /dev/sdb: 146.2 GB, 146163105792 bytes255 heads, 63 sectors/track, 17769 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1       17769   142729461   8e  Linux LVMCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.[admin@56_74 ~]# partprobe /dev/sdb

再搞SDA4

[admin@56_74 ~]# fdisk /dev/sdaWARNING: DOS-compatible mode is deprecated. It's strongly recommended to         switch off the mode (command 'c') and change display units to         sectors (command 'u').Command (m for help): pDisk /dev/sda: 146.2 GB, 146163105792 bytes64 heads, 32 sectors/track, 139392 cylindersUnits = cylinders of 2048 * 512 = 1048576 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00064d08   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1       10241    10486768   83  Linux/dev/sda2           10242       12289     2097152   82  Linux swap / Solaris/dev/sda3           12290       32769    20971520   83  Linux/dev/sda4           32770      139392   109181952   83  LinuxCommand (m for help): tPartition number (1-4): 4Hex code (type L to list codes): 8eChanged system type of partition 4 to 8e (Linux LVM)Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.WARNING: Re-reading the partition table failed with error 16: Device or resource busy.The kernel still uses the old table. The new table will be used atthe next reboot or after you run partprobe(8) or kpartx(8)Syncing disks.[admin@56_74 ~]# partprobe /dev/sda

第三步：根据逻辑图，咱们创建PV:

[admin@56_74 ~]# pvcreate /dev/sda4  /dev/sdb1 File descriptor 3 (socket:[222175]) leaked on pvcreate invocation. Parent PID 12138: -bash  Writing physical volume data to disk "/dev/sda4"  Physical volume "/dev/sda4" successfully created  Writing physical volume data to disk "/dev/sdb1"  Physical volume "/dev/sdb1" successfully created

第四步，创建VG

[admin@56_74 ~]# vgcreate Vgroup1 /dev/sdb1 /dev/sda4   File descriptor 3 (socket:[222175]) leaked on vgcreate invocation. Parent PID 12138: -bash  Volume group "Vgroup1" successfully created

第五步，创建lv，并格式化挂载

[admin@56_74 ~]# lvcreate -L 240G -n lv1 Vgroup1File descriptor 3 (socket:[222175]) leaked on lvcreate invocation. Parent PID 12138: -bash  Logical volume "lv1" created[admin@56_74 ~]# mkfs.ext3 /dev/llog    loop0  loop1  loop2  loop3  loop4  loop5  loop6  loop7  lp0    lp1    lp2    lp3    [admin@56_74 ~]# mkfs.ext3 /dev/llog    loop0  loop1  loop2  loop3  loop4  loop5  loop6  loop7  lp0    lp1    lp2    lp3    [admin@56_74 ~]# mkfs.ext3 /dev/Vgroup1/lv1 mke2fs 1.41.12 (17-May-2010)Filesystem label=OS type: LinuxBlock size=4096 (log=2)Fragment size=4096 (log=2)Stride=0 blocks, Stripe width=0 blocks15728640 inodes, 62914560 blocks3145728 blocks (5.00%) reserved for the super userFirst data block=0Maximum filesystem blocks=42949672961920 block groups32768 blocks per group, 32768 fragments per group8192 inodes per groupSuperblock backups stored on blocks:         32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,         4096000, 7962624, 11239424, 20480000, 23887872Writing inode tables: done                            Creating journal (32768 blocks): doneWriting superblocks and filesystem accounting information: doneThis filesystem will be automatically checked every 24 mounts or180 days, whichever comes first.  Use tune2fs -c or -i to override.[admin@56_74 ~]# [admin@56_74 ~]# [admin@56_74 ~]# mount /dev/Vgroup1/lv1 /data

[admin@56_74 ~]# df -Th

Filesystem Type Size Used Avail Use% Mounted on

/dev/sda1 ext3 9.9G 1.6G 7.8G 17% /

/dev/sda3 ext3 20G 240M 19G 2% /usr/local

tmpfs tmpfs 16G 32K 16G 1% /dev/shm

/dev/mapper/Vgroup1-lv1

ext3 237G 188M 225G 1% /data

小结：以下是摘自LVM管理的一部分命令。

一、PV管理

1、创建

pvcreate /dev/sdb1 #磁盘需要为lvm类型

2、查看