CentOS7.x系统根目录分区扩容

说明：系统版本为 Linux version 3.10.0-327.el7.x86_64

step1. 查看现有磁盘信息，可以看出根分区有45G

[root@DEV-CMDB-DB02 ~]# df -hFilesystem       Size Used Avail Use% Mounted on/dev/mapper/centos_mb--centos7-root 45G 9.8G 35G 23% /devtmpfs        5.9G  0 5.9G 0% /devtmpfs        5.9G 84K 5.9G 1% /dev/shmtmpfs        5.9G 8.9M 5.9G 1% /runtmpfs        5.9G  0 5.9G 0% /sys/fs/cgroup/dev/sda1       497M 142M 356M 29% /boottmpfs        1.2G 16K 1.2G 1% /run/user/42tmpfs        1.2G  0 1.2G 0% /run/user/0

step2. 查看新增加的磁盘信息

[root@DEV-CMDB-DB02 ~]# fdisk -lDisk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x000e0945 Device Boot  Start   End  Blocks Id System/dev/sda1 *  2048  1026047  512000 83 Linux/dev/sda2   1026048 104857599 51915776 8e Linux LVMDisk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/mapper/centos_mb--centos7-root: 47.7 GB, 47747956736 bytes, 93257728 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk /dev/mapper/centos_mb--centos7-swap: 5368 MB, 5368709120 bytes, 10485760 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytes

step3. 根据以上信息，对新增加的磁盘进行分区

[root@DEV-CMDB-DB02 ~]# fdisk /dev/sdbWelcome to fdisk (util-linux 2.23.2).Changes will remain in memory only, until you decide to write them.Be careful before using the write command.Device does not contain a recognized partition tableBuilding a new DOS disklabel with disk identifier 0x232defba.Command (m for help): pDisk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x232defba Device Boot  Start   End  Blocks Id SystemCommand (m for help): nPartition type: p primary (0 primary, 0 extended, 4 free) e extendedSelect (default p): pPartition number (1-4, default 1): 1First sector (2048-209715199, default 2048): Using default value 2048Last sector, +sectors or +size{K,M,G} (2048-209715199, default 209715199): Using default value 209715199Partition 1 of type Linux and of size 100 GiB is setCommand (m for help): tSelected partition 1Hex code (type L to list all codes): L 0 Empty   24 NEC DOS   81 Minix / old Lin bf Solaris   1 FAT12   27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root  39 Plan 9   83 Linux   c4 DRDOS/sec (FAT- 3 XENIX usr  3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M  40 Venix 80286  85 Linux extended c7 Syrinx   5 Extended  41 PPC PReP Boot 86 NTFS volume set da Non-FS data  6 FAT16   42 SFS    87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS/exFAT 4d QNX4.x   88 Linux plaintext de Dell Utility 8 AIX    4e QNX4.x 2nd part 8e Linux LVM  df BootIt   9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba   e1 DOS access  a OS/2 Boot Manag 50 OnTrack DM  94 Amoeba BBT  e3 DOS R/O   b W95 FAT32  51 OnTrack DM6 Aux 9f BSD/OS   e4 SpeedStor  c W95 FAT32 (LBA) 52 CP/M   a0 IBM Thinkpad hi eb BeOS fs   e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD   ee GPT    f W95 Ext'd (LBA) 54 OnTrackDM6  a6 OpenBSD   ef EFI (FAT-12/16/10 OPUS   55 EZ-Drive  a7 NeXTSTEP  f0 Linux/PA-RISC b11 Hidden FAT12 56 Golden Bow  a8 Darwin UFS  f1 SpeedStor  12 Compaq diagnost 5c Priam Edisk  a9 NetBSD   f4 SpeedStor  14 Hidden FAT16 <3 61 SpeedStor  ab Darwin boot  f2 DOS secondary 16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+  fb VMware VMFS 17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs   fc VMware VMKCORE 18 AST SmartSleep 65 Novell Netware b8 BSDI swap  fd Linux raid auto1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep  1c Hidden W95 FAT3 75 PC/IX   be Solaris boot ff BBT   1e Hidden W95 FAT1 80 Old Minix  Hex code (type L to list all codes): 8eChanged type of partition 'Linux' to 'Linux LVM'Command (m for help): pDisk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x232defba Device Boot  Start   End  Blocks Id System/dev/sdb1   2048 209715199 104856576 8e Linux LVMCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.

step4. 创建物理卷

[root@DEV-CMDB-DB02 ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created

step5. 查看物理卷信息

[root@DEV-CMDB-DB02 ~]# pvdisplay --- Physical volume --- PV Name    /dev/sda2 VG Name    centos_mb-centos7 PV Size    49.51 GiB / not usable 3.00 MiB Allocatable   yes PE Size    4.00 MiB Total PE    12674 Free PE    10 Allocated PE   12664 PV UUID    8WbgjB-T1Lf-kqUD-qPFw-UwJu-B9Lc-GAUTUB  "/dev/sdb1" is a new physical volume of "100.00 GiB" --- NEW Physical volume --- PV Name    /dev/sdb1 VG Name     PV Size    100.00 GiB Allocatable   NO PE Size    0  Total PE    0 Free PE    0 Allocated PE   0 PV UUID    HOknRs-TnMy-wtfX-sGqD-5RK9-dk9q-ze13fj

[root@DEV-CMDB-DB02 ~]# vgdisplay --- Volume group --- VG Name    centos_mb-centos7 System ID    Format    lvm2 Metadata Areas  1 Metadata Sequence No 3 VG Access    read/write VG Status    resizable MAX LV    0 Cur LV    2 Open LV    2 Max PV    0 Cur PV    1 Act PV    1 VG Size    49.51 GiB PE Size    4.00 MiB Total PE    12674 Alloc PE / Size  12664 / 49.47 GiB Free PE / Size  10 / 40.00 MiB VG UUID    aN2D2P-Rk1y-wGFz-5l2I-5CcD-7s88-Z8czc7

step6. 将新增加的分区/dev/sdb1加入到根目录分区centos_mb-centos7中

[root@DEV-CMDB-DB02 ~]# vgextend centos_mb-centos7 /dev/sdb1 Volume group "centos_mb-centos7" successfully extended

step7. 重新查看卷组信息

[root@DEV-CMDB-DB02 ~]# vgdisplay --- Volume group --- VG Name    centos_mb-centos7 System ID    Format    lvm2 Metadata Areas  2 Metadata Sequence No 4 VG Access    read/write VG Status    resizable MAX LV    0 Cur LV    2 Open LV    2 Max PV    0 Cur PV    2 Act PV    2 VG Size    149.50 GiB PE Size    4.00 MiB Total PE    38273 Alloc PE / Size  12664 / 49.47 GiB Free PE / Size  25609 / 100.04 GiB VG UUID    aN2D2P-Rk1y-wGFz-5l2I-5CcD-7s88-Z8czc7

step9. 进行卷扩容

[root@DEV-CMDB-DB02 ~]# lvextend -l +100%FREE /dev/mapper/centos_mb--centos7-root Size of logical volume centos_mb-centos7/root changed from 44.47 GiB (11384 extents) to 144.50 GiB (36993 extents). Logical volume root successfully resized.

step10. 调整卷分区大小

[root@DEV-CMDB-DB02 ~]# xfs_growfs /dev/mapper/centos_mb--centos7-rootmeta-data=/dev/mapper/centos_mb--centos7-root isize=256 agcount=4, agsize=2914304 blks   =      sectsz=512 attr=2, projid32bit=1   =      crc=0  finobt=0data  =      bsize=4096 blocks=11657216, imaxpct=25   =      sunit=0  swidth=0 blksnaming =version 2    bsize=4096 ascii-ci=0 ftype=0log  =internal    bsize=4096 blocks=5692, version=2   =      sectsz=512 sunit=0 blks, lazy-count=1realtime =none     extsz=4096 blocks=0, rtextents=0data blocks changed from 11657216 to 37880832

最后，查看磁盘信息可以看出根目录分区大小已成功扩容

[root@DEV-CMDB-DB02 ~]# df -hFilesystem       Size Used Avail Use% Mounted on/dev/mapper/centos_mb--centos7-root 145G 9.8G 135G 7% /devtmpfs        5.9G  0 5.9G 0% /devtmpfs        5.9G 84K 5.9G 1% /dev/shmtmpfs        5.9G 8.9M 5.9G 1% /runtmpfs        5.9G  0 5.9G 0% /sys/fs/cgroup/dev/sda1       497M 142M 356M 29% /boottmpfs        1.2G 16K 1.2G 1% /run/user/42tmpfs        1.2G  0 1.2G 0% /run/user/0

原标题：CentOS7.x系统根目录分区扩容

关键词：Centos