1、准备扩容/dev/mapper/centos-root [root@ceph-admin ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 484M 0 484M 0% /dev tmpfs tmpfs 496M 0 496M 0% /dev/shm tmpfs tmpfs 496M 6.8M 489M 2% /run tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup /dev/mapper/centos-root xfs 9.8G 8.2G 1.7G 84% / /dev/sda1 xfs 1014M 205M 810M 21% /boot tmpfs tmpfs 100M 0 100M 0% /run/user/0 2、查看可用磁盘/dev/sdb [root@ceph-admin ~]# fdisk -l Disk /dev/sda: 12.9 GB, 12884901888 bytes, 25165824 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: 0x000d06ab Device Boot Start End Blocks Id System /dev/sda1 * 2048 2099199 1048576 83 Linux /dev/sda2 2099200 25165823 11533312 8e Linux LVM Disk /dev/sdb: 12.9 GB, 12884901888 bytes, 25165824 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/mapper/centos-root: 10.5 GB, 10515120128 bytes, 20537344 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/mapper/centos-swap: 1287 MB, 1287651328 bytes, 2514944 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 3、创建分区/dev/sdb1 [root@ceph-admin ~]# 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 0xca473b44. Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition g create a new empty GPT partition table G create an IRIX (SGI) partition table l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) 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 (2048-25165823, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-25165823, default 25165823): Using default value 25165823 Partition 1 of type Linux and of size 12 GiB is set Command (m for help): p Disk /dev/sdb: 12.9 GB, 12884901888 bytes, 25165824 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: 0xca473b44 Device Boot Start End Blocks Id System /dev/sdb1 2048 25165823 12581888 83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. 4、查看分区/dev/sdb1 [root@ceph-admin ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 12G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 11G 0 part ├─centos-root 253:0 0 9.8G 0 lvm / └─centos-swap 253:1 0 1.2G 0 lvm [SWAP] sdb 8:16 0 12G 0 disk └─sdb1 8:17 0 12G 0 part 6、创建物理卷/dev/sdb1 [root@ceph-admin ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created. 7、查询物理卷/dev/sdb1 [root@ceph-admin ~]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name centos PV Size <11.00 GiB / not usable 3.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 2815 Free PE 1 Allocated PE 2814 PV UUID 0JO4Gd-o6tb-VdXZ-Lp87-QhXI-NHlM-M8JMOA "/dev/sdb1" is a new physical volume of "<12.00 GiB" --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size <12.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID cnP7e2-MHFa-rS8u-9foh-m4kq-MD7x-OCaQ1h 8、查看卷组名称centos [root@ceph-admin ~]# vgdisplay --- Volume group --- VG Name centos 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 <11.00 GiB PE Size 4.00 MiB Total PE 2815 Alloc PE / Size 2814 / 10.99 GiB Free PE / Size 1 / 4.00 MiB VG UUID Um6Uo9-NS4w-IEK3-EwVj-GZcc-Z2mY-nK1HN0 9、通过vgextend将新添加卷/dev/sdb1加入到卷组centos中 [root@ceph-admin ~]# vgextend vgextend centos /dev/sdb1 Device centos not found. [root@ceph-admin ~]# vgextend centos /dev/sdb1 Volume group "centos" successfully extended 10、扩容卷组后，卷组空余块 [root@ceph-admin ~]# vgdisplay --- Volume group --- VG Name centos 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 22.99 GiB PE Size 4.00 MiB Total PE 5886 Alloc PE / Size 2814 / 10.99 GiB Free PE / Size 3072 / 12.00 GiB VG UUID Um6Uo9-NS4w-IEK3-EwVj-GZcc-Z2mY-nK1HN0 11、通过lvextend命令扩展根目录挂载点/dev/mapper/centos-root [root@ceph-admin ~]# lvextend -L +12G /dev/mapper/centos-root Size of logical volume centos/root changed from 9.79 GiB (2507 extents) to 21.79 GiB (5579 extents). Logical volume centos/root successfully resized. [root@ceph-admin ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 484M 0 484M 0% /dev tmpfs tmpfs 496M 0 496M 0% /dev/shm tmpfs tmpfs 496M 6.8M 489M 2% /run tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup /dev/mapper/centos-root xfs 9.8G 8.2G 1.7G 84% / /dev/sda1 xfs 1014M 205M 810M 21% /boot tmpfs tmpfs 100M 0 100M 0% /run/user/0 12、同步文件系统 [root@ceph-admin ~]# xfs_growfs /dev/mapper/centos-root meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=641792 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=2567168, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 2567168 to 5712896 13、查看根目录挂载点“/”已经扩容 [root@ceph-admin ~]# df -Th Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 484M 0 484M 0% /dev tmpfs tmpfs 496M 0 496M 0% /dev/shm tmpfs tmpfs 496M 6.8M 489M 2% /run tmpfs tmpfs 496M 0 496M 0% /sys/fs/cgroup /dev/mapper/centos-root xfs 22G 8.2G 14G 38% / /dev/sda1 xfs 1014M 205M 810M 21% /boot tmpfs tmpfs 100M 0 100M 0% /run/user/0 [root@ceph-admin ~]#
标签：扩容,tmpfs,centos,bytes,dev,Linux,根目录,512,root From： https://www.cnblogs.com/gkhost/p/16882446.html