Linux root卷扩展

由于Linux 根卷使用率非常高，影响了应用正常运行，现将linux 系统的根卷扩展步骤如下:

 

1: 新增一个磁盘LUN /dev/sdb	[root@node-16 bookinfo]# fdisk -l Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x0009e924    Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048     2099199     1048576   83  Linux /dev/sda2         2099200   104660991    51280896   8e  Linux LVM Disk /dev/mapper/centos-root: 52.5 GB, 52504297472 bytes, 102547456 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
创建PV	[root@node-1 bookinfo]# pvscan   PV /dev/sda2   VG centos          lvm2 [48.90 GiB / 4.00 MiB free]   Total: 1 [48.90 GiB] / in use: 1 [48.90 GiB] / in no VG: 0 [0   ] [root@node-1 bookinfo]# pvcreate /dev/sdb   Physical volume "/dev/sdb" successfully created. [root@node-1 bookinfo]# v
vg扩容	[root@node-1 bookinfo]# vgscan   Reading volume groups from cache.   Found volume group "centos" using metadata type lvm2 [root@node-1 bookinfo]# pvscan   PV /dev/sda2   VG centos          lvm2 [48.90 GiB / 4.00 MiB free]   PV /dev/sdb                       lvm2 [100.00 GiB]   Total: 2 [148.90 GiB] / in use: 1 [48.90 GiB] / in no VG: 1 [100.00 GiB] [root@node-1 bookinfo]# vgextend centos  /dev/sdb   Volume group "centos" successfully extended [root@node-1 bookinfo]# [root@node-1 bookinfo]# pvscan   PV /dev/sda2   VG centos          lvm2 [48.90 GiB / 4.00 MiB free]   PV /dev/sdb    VG centos          lvm2 [<100.00 GiB / <100.00 GiB free]   Total: 2 [<148.90 GiB] / in use: 2 [<148.90 GiB] / in no VG: 0 [0   ] [root@node-1 bookinfo]#
LV 扩展	[root@node-1 bookinfo]# lvscan   ACTIVE            '/dev/centos/root' [<48.90 GiB] inherit [root@node-1 bookinfo]# lvextend -l 100%FREE /dev/centos/root   Size of logical volume centos/root changed from <48.90 GiB (12518 extents) to 100.00 GiB (25600 extents).   Logical volume centos/root successfully resized. [root@node-1 bookinfo]# [root@node-1 bookinfo]# [root@node-1 bookinfo]# lvscan   ACTIVE            '/dev/centos/root' [100.00 GiB] inherit [root@node-1 bookinfo]# [root@node-1 bookinfo]# [root@node-1 ~]# lvscan   ACTIVE            '/dev/centos/root' [100.00 GiB] inherit [root@node-1 ~]# pvscan   PV /dev/sda2   VG centos          lvm2 [48.90 GiB / 0    free]   PV /dev/sdb    VG centos          lvm2 [<100.00 GiB / <48.90 GiB free]   Total: 2 [<148.90 GiB] / in use: 2 [<148.90 GiB] / in no VG: 0 [0   ] [root@node-1 ~]# lvextend -L +48G /dev/centos/root   Size of logical volume centos/root changed from 100.00 GiB (25600 extents) to 148.00 GiB (37888 extents).   Logical volume centos/root successfully resized. [root@node-1 ~]# [root@node-1 ~]# [root@node-1 ~]# lvscan   ACTIVE            '/dev/centos/root' [148.00 GiB] inherit [root@node-16 ~]# pvscan   PV /dev/sda2   VG centos          lvm2 [48.90 GiB / 0    free]   PV /dev/sdb    VG centos          lvm2 [<100.00 GiB / 920.00 MiB free]   Total: 2 [<148.90 GiB] / in use: 2 [<148.90 GiB] / in no VG: 0 [0   ] [root@node-1 ~]# [root@node-1 ~]#
resizefs 刷新文件系统信息	[root@node-1 ~]# [root@node-1 ~]# df -Th Filesystem              Type      Size  Used Avail Use% Mounted on devtmpfs                devtmpfs  8.3G     0  8.3G   0% /dev tmpfs                   tmpfs     8.3G     0  8.3G   0% /dev/shm tmpfs                   tmpfs     8.3G   45M  8.2G   1% /run tmpfs                   tmpfs     8.3G     0  8.3G   0% /sys/fs/cgroup /dev/mapper/centos-root xfs        49G   42G  7.2G  86% / /dev/sda1               xfs      1014M  228M  787M  23% /boot [root@node-1 ~]# xfs_growfs  /dev/centos/root meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3204608 blks          =                       sectsz=512   attr=2, projid32bit=1          =                       crc=1        finobt=0 spinodes=0 data     =                       bsize=4096   blocks=12818432, imaxpct=25          =                       sunit=0      swidth=0 blks naming   =version 2              bsize=4096   ascii-ci=0 ftype=1 log      =internal               bsize=4096   blocks=6259, version=2          =                       sectsz=512   sunit=0 blks, lazy-count=1 realtime =none                   extsz=4096   blocks=0, rtextents=0 data blocks changed from 12818432 to 38797312 [root@node-1 ~]# [root@node-1 ~]# [root@node-1 ~]# [root@node-1 ~]# df -Th Filesystem              Type      Size  Used Avail Use% Mounted on devtmpfs                devtmpfs  8.3G     0  8.3G   0% /dev tmpfs                   tmpfs     8.3G     0  8.3G   0% /dev/shm tmpfs                   tmpfs     8.3G   45M  8.2G   1% /run tmpfs                   tmpfs     8.3G     0  8.3G   0% /sys/fs/cgroup /dev/mapper/centos-root xfs       148G   42G  107G  28% / /dev/sda1               xfs      1014M  228M  787M  23% /boot