RHEL|如何扩展Liunx系统分区大小 linux|Linux

作者：IT邦德中国DBA联盟(ACDU)成员，目前从事DBA及程序编程（Web\java\Python）工作，主要服务于生产制造现拥有 Oracle 11gOCP/OCM、 Mysql、Oceanbase（OBCA）认证分布式TBase\TDSQL数据库、国产达梦数据库以及红帽子认证从业8年DBA工作，在数据库领域有丰富的经验 B站主播Oracle、Mysql、PG实战课程，请搜索：jeames007擅长Oracle数据库运维开发，备份恢复，安装迁移，性能优化、故障应急处理等。

文章图片

文章目录

前言
- 1.分区大小
- 2.裸盘划分
- 3.创建 PV
- 4.扩展逻辑卷
- 5.再次确认分区大小

前言近日服务器的根目录快满了，仔细一查看使用的是逻辑卷，本文总结了以下扩展分区的方法，本次扩展的是根分区 1.分区大小

[root@rhel76 ~]# df -Th FilesystemTypeSizeUsed Avail Use% Mounted on /dev/mapper/rhel-root xfs30G4.3G26G15% / devtmpfsdevtmpfs2.0G02.0G0% /dev tmpfstmpfs2.0G02.0G0% /dev/shm tmpfstmpfs2.0G13M2.0G1% /run tmpfstmpfs2.0G02.0G0% /sys/fs/cgroup /dev/sda1xfs950M164M786M18% /boot /dev/mapper/rhel-u01xfs28G33M28G1% /u01 tmpfstmpfs394M4.0K394M1% /run/user/42 tmpfstmpfs394M48K394M1% /run/user/0可以看出/分区已经明明显不足，需要扩展

文章图片

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

文章图片

[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: pprimary (0 primary, 0 extended, 4 free) eextended 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 setCommand (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/sdb12048419430392097049683Linux Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors /dev/sda1*2048195379197587283Linux /dev/sda21953792125829119619376648eLinux 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

文章图片

3.创建 PV

[root@rhel76 ~]# pvs PVVGFmtAttr PSizePFree /dev/sda2rhel lvm2 a--<59.07g 4.00m[root@rhel76 ~]# pvcreate /dev/sdb1 Physical volume "/dev/sdb1" successfully created.[root@rhel76 ~]# pvs PVVGFmtAttr PSizePFree /dev/sda2rhel lvm2 a--<59.07g4.00m /dev/sdb1lvm2 ---<20.00g <20.00g

4.扩展逻辑卷

[root@rhel76 ~]# vgs VG#PV #LV #SN AttrVSizeVFree rhel130 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 AttrVSizeVFree rhel230 wz--n- 79.06g 20.00g[root@rhel76 ~]# vgs VG#PV #LV #SN AttrVSizeVFree jem_vg100 wz--n- <20.00g <20.00g rhel130 wz--n- <59.07g4.00m[root@rhel76 ~]# lvdisplay --- Logical volume --- LV Path/dev/rhel/root LV Nameroot VG Namerhel LV UUIDfB06rl-92CE-trM6-e2tM-pP4o-6SKt-p03lGC LV Write Accessread/write LV Creation host, time rhel76, 2021-06-26 22:04:57 +0000 LV Statusavailable # open1 LV Size<29.26 GiB Current LE7490 Segments1 Allocationinherit Read ahead sectorsauto - currently set to8192 Block device253:0[root@rhel76 ~]# lvs LVVGAttrLSizePool Origin Data%Meta%Move Log Cpy%Sync Convert root rhel -wi-ao---- <29.26g swap rhel -wi-ao----1.86g u01rhel -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=https://www.it610.com/dev/mapper/rhel-rootisize=512agcount=4, agsize=1917440 blks =sectsz=512attr=2, projid32bit=1 =crc=1finobt=0 spinodes=0 data=bsize=4096blocks=7669760, imaxpct=25 =sunit=0swidth=0 blks naming=version 2bsize=4096ascii-ci=0 ftype=1 log=internalbsize=4096blocks=3745, version=2 =sectsz=512sunit=0 blks, lazy-count=1 realtime =noneextsz=4096blocks=0, rtextents=0 data blocks changed from 7669760 to 12388352

5.再次确认分区大小

[root@rhel76 ~]# df -TH FilesystemTypeSizeUsed Avail Use% Mounted on /dev/mapper/rhel-root xfs51G4.4G47G9% / devtmpfsdevtmpfs2.1G02.1G0% /dev tmpfstmpfs2.1G02.1G0% /dev/shm tmpfstmpfs2.1G14M2.1G1% /run tmpfstmpfs2.1G02.1G0% /sys/fs/cgroup /dev/sda1xfs996M172M825M18% /boot /dev/mapper/rhel-u01xfs30G34M30G1% /u01 tmpfstmpfs413M4.1k413M1% /run/user/42 tmpfstmpfs413M54k413M1% /run/user/0