lvm的逻辑卷,可能由一个或者多个硬盘或者分区组成,如何才能安全的删除逻辑卷中的硬盘或者分区呢。适用场景,我有二块小硬盘,我想把其中一块小的硬盘换成大的。首先就要把逻辑卷中的小硬盘,安全的删除掉。下面是操作的详细过程。
1,查看分区情况
- [root@iZ94zz3wqciZ data]# df -h
- Filesystem Size Used Avail Use% Mounted on
- /dev/xvda1 20G 15G 4.6G 76% /
- tmpfs 498M 0 498M 0% /dev/shm
- /dev/mapper/myfiles-fastdfs
- 27G 9.9G 16G 39% /mnt/fastdfs
这里的27G,是由一块22G的硬盘和一块5G的硬盘组成的
2,取消挂载,进行硬盘检测
- [root@iZ94zz3wqciZ ~]# umount /mnt/fastdfs/ //取消挂
- [root@iZ94zz3wqciZ ~]# e2fsck -f /dev/mapper/myfiles-fastdfs //磁盘检测
- e2fsck 1.41.12 (17-May-2010)
- Pass 1: Checking inodes, blocks, and sizes
- Pass 2: Checking directory structure
- Pass 3: Checking directory connectivity
- Pass 4: Checking reference counts
- Pass 5: Checking group summary information
- /dev/mapper/myfiles-fastdfs: 103722/1769472 files (0.1% non-contiguous), 2686136/7072768 blocks
3,对逻辑卷重定义大小
- [root@iZ94zz3wqciZ ~]# resize2fs -p /dev/mapper/myfiles-fastdfs 21G //重定义大小
- resize2fs 1.41.12 (17-May-2010)
- Resizing the filesystem on /dev/mapper/myfiles-fastdfs to 5505024 (4k) blocks.
- Begin pass 2 (max = 529848)
- Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- Begin pass 3 (max = 216)
- Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- Begin pass 4 (max = 66693)
- Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- The filesystem on /dev/mapper/myfiles-fastdfs is now 5505024 blocks long.
- [root@iZ94zz3wqciZ ~]# lvreduce -L 21G /dev/mapper/myfiles-fastdfs //重定义大小
- WARNING: Reducing active logical volume to 21.00 GiB
- THIS MAY DESTROY YOUR DATA (filesystem etc.)
- Do you really want to reduce fastdfs? [y/n]: y
- Size of logical volume myfiles/fastdfs changed from 26.98 GiB (6907 extents) to 21.00 GiB (5376 extents).
- Logical volume fastdfs successfully resized
由27G变成21G,大于要删除的5G盘,就算5G的盘子数据满了,也可以全部移走
4,查看物理卷情况
- [root@iZ94zz3wqciZ ~]# pvdisplay -m
- --- Physical volume ---
- PV Name /dev/xvdb1
- VG Name myfiles
- PV Size 21.99 GiB / not usable 4.78 MiB
- Allocatable yes
- PE Size 4.00 MiB
- Total PE 5629
- Free PE 253
- Allocated PE 5376
- PV UUID N2kxpi-FjET-rQ8p-MaDF-z3tH-fK3L-oW1STl
- --- Physical Segments ---
- Physical extent 0 to 5375:
- Logical volume /dev/myfiles/fastdfs
- Logical extents 0 to 5375
- Physical extent 5376 to 5628:
- FREE
- --- Physical volume ---
- PV Name /dev/xvdc1
- VG Name myfiles
- PV Size 4.99 GiB / not usable 2.41 MiB
- Allocatable yes //激活状态,可写入
- PE Size 4.00 MiB
- Total PE 1278 //总共1278PE
- Free PE 1278 //空闲1278PE,也就是说这块硬盘是空的
- Allocated PE 0
- PV UUID 4sNW6e-XTha-7lYy-L2k8-uvWV-xxaN-wqXf0i
- --- Physical Segments ---
- Physical extent 0 to 1277:
- FREE
5,注销要删除的硬盘xvdc1
- [root@iZ94zz3wqciZ ~]# pvchange -xn /dev/xvdc1 //注销xvdc1
- Physical volume "/dev/xvdc1" changed
- 1 physical volume changed / 0 physical volumes not changed
- [root@iZ94zz3wqciZ ~]# pvdisplay -m
- --- Physical volume ---
- PV Name /dev/xvdb1
- VG Name myfiles
- PV Size 21.99 GiB / not usable 4.78 MiB
- Allocatable yes
- PE Size 4.00 MiB
- Total PE 5629
- Free PE 253
- Allocated PE 5376
- PV UUID N2kxpi-FjET-rQ8p-MaDF-z3tH-fK3L-oW1STl
- --- Physical Segments ---
- Physical extent 0 to 5375:
- Logical volume /dev/myfiles/fastdfs
- Logical extents 0 to 5375
- Physical extent 5376 to 5628:
- FREE
- --- Physical volume ---
- PV Name /dev/xvdc1
- VG Name myfiles
- PV Size 4.99 GiB / not usable 2.41 MiB
- Allocatable NO //不是激活状态了
- PE Size 4.00 MiB
- Total PE 1278
- Free PE 1278
- Allocated PE 0
- PV UUID 4sNW6e-XTha-7lYy-L2k8-uvWV-xxaN-wqXf0i
- --- Physical Segments ---
- Physical extent 0 to 1277:
- FREE
6,移动数据,将要删除的盘的数据移动到别的盘
- [root@iZ94zz3wqciZ ~]# pvmove -i 1 /dev/xvdc1
- No data to move for myfiles
这一步,非常重要,如果盘子里面有数据,不做这一步,会造成数据丢失
7,将硬盘或分区从逻辑卷组中删除,并删除物理卷
- [root@iZ94zz3wqciZ ~]# vgreduce myfiles /dev/xvdc1 //从逻辑卷组中删除
- Removed "/dev/xvdc1" from volume group "myfiles"
- [root@iZ94zz3wqciZ ~]# pvremove /dev/xvdc1
- Labels on physical volume "/dev/xvdc1" successfully wiped //删除物理卷
8,挂载并查看结果
- [root@iZ94zz3wqciZ ~]# mount -a
- [root@iZ94zz3wqciZ ~]# df -h
- Filesystem Size Used Avail Use% Mounted on
- /dev/xvda1 20G 15G 4.6G 76% /
- tmpfs 498M 0 498M 0% /dev/shm
- /dev/mapper/myfiles-fastdfs
- 21G 9.9G 9.8G 51% /mnt/fastdfs
到这儿,就安全的删除一个硬盘或者分区了。
转载请注明
作者:海底苍鹰
地址:http://blog.51yip.com/linux/1779.html