LVM 管理之二：縮減 LV 大小
阿新 • • 發佈：2018-11-23
轉載http://francs3.blog.163.com/blog/static/4057672720122299250175/
今天學習了 RHEL6 縮減 LV 大小，下面的例子目標是將LV "/dev/mapper/vg_redhat6-lv_pgdata_01"
縮小 86 M。
--1 當前LVM 資訊
| /dev/mapper/vg_redhat6-lv_root 13G 7.7G 4.6G 63% / tmpfs 250M 264K 250M 1% /dev/shm /dev/sda1 485M 31M 429M 7% /boot /dev/sr0 2.9G 2.9G 0 100% /media/RHEL_6.2 i386 Disc 1 /dev/mapper/vg_redhat6-lv_pgdata_01 786M |
--2 解除安裝檔案系統 ( unmount )
| [[email protected] ~]# umount /dev/mapper/vg_redhat6-lv_pgdata_01 |
--3 檢查檔案系統( e2fsck )
| [[email protected] ~]# e2fsck /dev/mapper/vg_redhat6-lv_pgdata_01 e2fsck 1.41.12 (17-May-2010) /dev/mapper/vg_redhat6-lv_pgdata_01: clean, 236/49152 files, 154817/179200 blocks |
--4 縮小檔案系統 ( resize2fs )
| [[email protected] ~]# resize2fs -f /dev/mapper/vg_redhat6-lv_pgdata_01 700M resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/vg_redhat6-lv_pgdata_01 to 179200 (4k) blocks. The filesystem on /dev/mapper/vg_redhat6-lv_pgdata_01 is now 179200 blocks long. |
--5 縮小LV大小（ lvreduce ）
| [[email protected] ~]# lvreduce -L 700M /dev/mapper/vg_redhat6-lv_pgdata_01 WARNING: Reducing active logical volume to 700.00 MiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lv_pgdata_01? [y/n]: y Reducing logical volume lv_pgdata_01 to 700.00 MiB Logical volume lv_pgdata_01 successfully resized |
--6 檢視當前 LV 大小
| [[email protected] ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert lv_pgdata_01 vg_redhat6 -wi-a- 700.00m lv_root vg_redhat6 -wi-ao 13.10g lv_swap vg_redhat6 -wi-ao 1.91g |
備註： 邏輯卷 lv_pgdata_01 已經縮減成 700M了。
--7 重新掛載檔案系統，檢視
| [[email protected] ~]# mount -t ext4 /dev/mapper/vg_redhat6-lv_pgdata_01 /database/skytf/pgdata1 [[email protected] ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_redhat6-lv_root 13G 7.7G 4.6G 63% / tmpfs 250M 264K 250M 1% /dev/shm /dev/sda1 485M 31M 429M 7% /boot /dev/sr0 2.9G 2.9G 0 100% /media/RHEL_6.2 i386 Disc 1 /dev/mapper/vg_redhat6-lv_pgdata_01 688M 593M 61M 91% /database/skytf/pgdata1 |
備註：目錄 /database/skytf/pgdata1 已成功縮減到 700M 左右。
--8 總結
在縮減LV 大小前，首先得先縮減檔案系統大小。