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Centos 使用空磁盘扩展xfs文件系统root分区
1.查看硬盘信息
[root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 600M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 198.4G 0 part ├─cl-root 253:0 0 176.4G 0 lvm / ├─cl-swap 253:1 0 2G 0 lvm [SWAP] └─cl-home 253:2 0 20G 0 lvm /home sdb 8:16 0 20G 0 disk sr0 11:0 1 10.1G 0 rom #空磁盘为sdb 2.将 /dev/sdb 添加到 LVM 卷组中
1. 初始化物理卷
将 /dev/sdb 初始化为物理卷：
[root@localhost ~]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created. 2. 将物理卷添加到卷组
假设你的卷组名为 cl，将新物理卷添加到卷组：
[root@localhost ~]# vgextend cl /dev/sdb Volume group "cl" successfully extended 3.扩展逻辑卷
1.扩展逻辑卷：
扩展 /root 分区的逻辑卷，假设你要将所有可用空间分配给 /root：
[root@localhost ~]# lvextend -l +100%FREE /dev/cl/root Size of logical volume cl/root changed from <176.38 GiB (45153 extents) to <196.38 GiB (50272 extents). Logical volume cl/root successfully resized. 2.扩展xfs文件系统：
扩展文件系统以使用新分配的空间。由于 /root 分区使用的是 XFS 文件系统，使用 xfs_growfs 命令：
[root@localhost ~]# xfs_growfs /dev/mapper/cl-root meta-data=/dev/mapper/cl-root isize=512 agcount=11, agsize=4587520 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=1, sparse=1, rmapbt=0 = reflink=1 data = bsize=4096 blocks=46236672, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0, ftype=1 log =internal log bsize=4096 blocks=8960, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 46236672 to 51478528 4.验证
1. 查看分区和文件系统信息
确认 /root 分区的大小已经更新：
[root@localhost ~]# df -Th 文件系统 类型 容量 已用 可用 已用% 挂载点 devtmpfs devtmpfs 876M 0 876M 0% /dev tmpfs tmpfs 895M 0 895M 0% /dev/shm tmpfs tmpfs 895M 8.7M 887M 1% /run tmpfs tmpfs 895M 0 895M 0% /sys/fs/cgroup /dev/mapper/cl-root xfs 197G 4.7G 192G 3% / /dev/mapper/cl-home xfs 20G 175M 20G 1% /home /dev/sda2 xfs 1014M 213M 802M 21% /boot /dev/sda1 vfat 599M 7.3M 592M 2% /boot/efi tmpfs tmpfs 179M 0 179M 0% /run/user/0 [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 600M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 198.4G 0 part ├─cl-root 253:0 0 196.4G 0 lvm / ├─cl-swap 253:1 0 2G 0 lvm [SWAP] └─cl-home 253:2 0 20G 0 lvm /home sdb 8:16 0 20G 0 disk └─cl-root 253:0 0 196.4G 0 lvm / sr0 11:0 1 10.1G 0 rom 2. 查看逻辑卷信息
检查逻辑卷的详细信息，以确认扩展已成功：
[root@localhost ~]# lvdisplay --- Logical volume --- LV Path /dev/cl/root LV Name root VG Name cl LV UUID gX9aeL-1Y8m-tGCz-Euka-YynN-SeY4-ecOMWu LV Write Access read/write LV Creation host, time localhost.localdomain, 2024-08-01 23:03:22 -0400 LV Status available # open 1 LV Size <196.38 GiB Current LE 50272 Segments 3 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 --- Logical volume --- LV Path /dev/cl/home LV Name home VG Name cl LV UUID dHsXfZ-okNT-82gk-6ed5-oXlP-BxUQ-rQV3xB LV Write Access read/write LV Creation host, time localhost.localdomain, 2024-08-01 23:03:22 -0400 LV Status available # open 1 LV Size 20.00 GiB Current LE 5120 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2 --- Logical volume --- LV Path /dev/cl/swap LV Name swap VG Name cl LV UUID SDh6NB-5tsS-Sdd6-uYpz-ygNi-bKiF-lU5hqn LV Write Access read/write LV Creation host, time localhost.localdomain, 2024-08-01 23:03:23 -0400 LV Status available # open 2 LV Size 2.03 GiB Current LE 520 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:1 