1.分区大小
[root@rhel76 ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/rhel-root xfs 30G 4.3G 26G 15% / devtmpfs devtmpfs 2.0G 0 2.0G 0% /dev tmpfs tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs tmpfs 2.0G 13M 2.0G 1% /run tmpfs tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup /dev/sda1 xfs 950M 164M 786M 18% /boot /dev/mapper/rhel-u01 xfs 28G 33M 28G 1% /u01 tmpfs tmpfs 394M 4.0K 394M 1% /run/user/42 tmpfs tmpfs 394M 48K 394M 1% /run/user/0 可以看出/分区已经明明显不足，需要扩展
2.裸盘划分
[root@rhel76 ~]# ll /dev/sd* brw-rw----. 1 root disk 8, 0 Nov 28 23:34 /dev/sda brw-rw----. 1 root disk 8, 1 Nov 28 23:34 /dev/sda1 brw-rw----. 1 root disk 8, 2 Nov 28 23:34 /dev/sda2 brw-rw----. 1 root disk 8, 16 Nov 28 23:34 /dev/sdb
[root@rhel76 ~]# fdisk /dev/sdb [root@rhel76 ~]# fdisk /dev/sdb Welcome 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 table Building a new DOS disklabel with disk identifier 0xa1773dc6. Command (m for help): n Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): Using default response p Partition number (1-4, default 1): 1 First sector (2048-41943039, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): Using default value 41943039 Partition 1 of type Linux and of size 20 GiB is set Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. [root@rhel76 ~]# ll /dev/sd* brw-rw----. 1 root disk 8, 0 Nov 28 23:34 /dev/sda brw-rw----. 1 root disk 8, 1 Nov 28 23:34 /dev/sda1 brw-rw----. 1 root disk 8, 2 Nov 28 23:34 /dev/sda2 brw-rw----. 1 root disk 8, 16 Nov 28 23:49 /dev/sdb brw-rw----. 1 root disk 8, 17 Nov 28 23:49 /dev/sdb1 [root@rhel76 ~]# fdisk -l | grep dev Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors /dev/sdb1 2048 41943039 20970496 83 Linux Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors /dev/sda1 * 2048 1953791 975872 83 Linux /dev/sda2 1953792 125829119 61937664 8e Linux LVM Disk /dev/mapper/rhel-root: 31.4 GB, 31415336960 bytes, 61358080 sectors Disk /dev/mapper/rhel-swap: 2000 MB, 2000683008 bytes, 3907584 sectors Disk /dev/mapper/rhel-u01: 30.0 GB, 30001856512 bytes, 58597376 sectors
3.创建 PV
[root@rhel76 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 rhel lvm2 a-- <59.07g 4.00m [root@rhel76 ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created. [root@rhel76 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 rhel lvm2 a-- <59.07g 4.00m /dev/sdb1 lvm2 --- <20.00g <20.00g
4.扩展逻辑卷
[root@rhel76 ~]# vgs VG #PV #LV #SN Attr VSize VFree rhel 1 3 0 wz--n- <59.07g 4.00m [root@rhel76 ~]# vgextend rhel /dev/sdb1 [root@rhel76 ~]# vgextend rhel /dev/sdb1 Volume group "rhel" successfully extended [root@rhel76 ~]# vgs VG #PV #LV #SN Attr VSize VFree rhel 2 3 0 wz--n- 79.06g 20.00g [root@rhel76 ~]# vgs VG #PV #LV #SN Attr VSize VFree jem_vg 1 0 0 wz--n- <20.00g <20.00g rhel 1 3 0 wz--n- <59.07g 4.00m [root@rhel76 ~]# lvdisplay --- Logical volume --- LV Path /dev/rhel/root LV Name root VG Name rhel LV UUID fB06rl-92CE-trM6-e2tM-pP4o-6SKt-p03lGC LV Write Access read/write LV Creation host, time rhel76, 2021-06-26 22:04:57 +0000 LV Status available # open 1 LV Size <29.26 GiB Current LE 7490 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 [root@rhel76 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root rhel -wi-ao---- <29.26g swap rhel -wi-ao---- 1.86g u01 rhel -wi-ao---- 27.94g [root@rhel76 ~]# lvextend -L +18G /dev/rhel/root Size of logical volume rhel/root changed from <29.26 GiB (7490 extents) to <47.26 GiB (12098 extents). Logical volume rhel/root successfully resized. 使用以下命令刷新lv [root@rhel76 ~]# xfs_growfs /dev/rhel/root meta-data=/dev/mapper/rhel-root isize=512 agcount=4, agsize=1917440 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=7669760, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=3745, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 7669760 to 12388352
5.再次确认分区大小
[root@rhel76 ~]# df -TH Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/rhel-root xfs 51G 4.4G 47G 9% / devtmpfs devtmpfs 2.1G 0 2.1G 0% /dev tmpfs tmpfs 2.1G 0 2.1G 0% /dev/shm tmpfs tmpfs 2.1G 14M 2.1G 1% /run tmpfs tmpfs 2.1G 0 2.1G 0% /sys/fs/cgroup /dev/sda1 xfs 996M 172M 825M 18% /boot /dev/mapper/rhel-u01 xfs 30G 34M 30G 1% /u01 tmpfs tmpfs 413M 4.1k 413M 1% /run/user/42 tmpfs tmpfs 413M 54k 413M 1% /run/user/0
很明显，/ 分区由原来的30G扩展到了51G
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