前言 今天 RMAN 备份恢复的时候发现磁盘空间不足了：
1 2 3 4 5 6 ORA-19502: write error on file "/oradata/rpt/tbs_ods04.dbf" , block number 2921152 (block size=8192) ORA-27072: File I/O error Linux-x86_64 Error: 28: No space left on device Additional information: 4 Additional information: 2921152 Additional information: -1
看一下磁盘空间：
1 2 3 4 5 6 7 8 9 10 [oracle@lucifer:/home/oracle]$ df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 16G 0 16G 0% /dev tmpfs 32G 0 32G 0% /dev/shm tmpfs 16G 25M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/mapper/centos-root 1008G 982G 26G 98% / /dev/sda2 1014M 142M 873M 14% /boot /dev/sda1 200M 12M 189M 6% /boot/efi tmpfs 3.2G 0 3.2G 0% /run/user/0
根目录空间不够用了，需要扩容，这是一台虚拟机，找系统工程师加了 1T 空间，手动在系统上进行扩容，记录一下操作过程。
根目录扩容 虚拟化加完空间后，需要重启主机生效：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 [oracle@lucifer:/home/oracle]$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 1T 0 disk ├─sda1 8:1 0 200M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 1022.8G 0 part ├─centos-root 253:0 0 1007.1G 0 lvm / └─centos-swap 253:1 0 15.8G 0 lvm [SWAP] sr0 11:0 1 1.2M 0 rom [root@lucifer:/root]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 2T 0 disk ├─sda1 8:1 0 200M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 1022.8G 0 part ├─centos-root 253:0 0 1007.1G 0 lvm / └─centos-swap 253:1 0 15.8G 0 lvm [SWAP] sr0 11:0 1 1.2M 0 rom
可以看到磁盘空间已经加到 /dev/sda 上，现在是 2T，但是需要扩容到根目录上，还需要操作下，本文使用 parted 命令进行扩容。
扩展GPT分区：
1 2 3 4 5 6 7 8 9 10 11 [root@lucifer:/root]# parted /dev/sda resizepart 3 100% Error: The backup GPT table is not at the end of the disk, as it should be. This might mean that another operating system believes the disk is smaller. Fix, by moving the backup to the end (and removing the old backup)? parted: invalid token: 3 Fix/Ignore/Cancel? Fix Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to use all of the space (an extra 2147483648 blocks) or continue with the current setting? Fix/Ignore? Fix Partition number? 3 End? [1100GB]? 100% Information: You may need to update /etc/fstab.
刷新分区表：
1 2 3 4 5 6 7 8 9 10 11 12 [root@lucifer:/root]# partprobe /dev/sda [root@lucifer:/root]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 2T 0 disk ├─sda1 8:1 0 200M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 2T 0 part ├─centos-root 253:0 0 1007.1G 0 lvm / └─centos-swap 253:1 0 15.8G 0 lvm [SWAP] sr0 11:0 1 1.2M 0 rom
扩展物理卷：
1 2 3 4 [root@lucifer:/root]# pvresize /dev/sda3 Physical volume "/dev/sda3" changed 1 physical volume(s) resized or updated / 0 physical volume(s) not resized
扩展逻辑卷：
1 2 3 4 [root@lucifer:/root]# lvextend -l +100%FREE /dev/mapper/centos-root Size of logical volume centos/root changed from 1007.05 GiB (257805 extents) to 1.98 TiB (519949 extents). Logical volume centos/root successfully resized.
扩展文件系统：
1 2 3 4 5 6 7 8 9 10 11 12 [root@lucifer:/root]# xfs_growfs / meta-data=/dev/mapper/centos-root isize=512 agcount=81, agsize=3276800 blks = sectsz=4096 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=263992320, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=6400, version=2 = sectsz=4096 sunit=1 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 263992320 to 532427776
验证结果：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [root@lucifer:/root]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 16G 0 16G 0% /dev tmpfs 32G 0 32G 0% /dev/shm tmpfs 16G 8.4M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/mapper/centos-root 2.0T 711G 1.3T 35% / /dev/sda2 1014M 142M 873M 14% /boot /dev/sda1 200M 12M 189M 6% /boot/efi tmpfs 3.2G 0 3.2G 0% /run/user/0 [root@lucifer:/root]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 2T 0 disk ├─sda1 8:1 0 200M 0 part /boot/efi ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 2T 0 part ├─centos-root 253:0 0 2T 0 lvm / └─centos-swap 253:1 0 15.8G 0 lvm [SWAP] sr0 11:0 1 1.2M 0 rom
可以看到：根目录从 1008G 成功扩展到 2.0 T。
写在最后 本文比较基础简单，仅做记录参考。
