逻辑卷迁移指南
适用条件：需要大规模拷贝磁盘文件的场景 实验环境说明：
- 两台CentOS 7主机，一台为逻辑卷迁出服务器(主机名：host1)，另一台为迁入目标主机(主机名：devel)
1.首先，我们看一下迁出服务器的磁盘分区结构，如下：
[root@host1 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 476M 0 part /boot
├─sda2 8:2 0 23.3G 0 part /
├─sda3 8:3 0 23.3G 0 part /APP
├─sda4 8:4 0 1K 0 part
├─sda5 8:5 0 1.9G 0 part [SWAP]
└─sda6 8:6 0 286M 0 part
sdb 8:16 0 10G 0 disk
├─sdb1 8:17 0 1G 0 part
│ └─vg_test-lv_test 253:0 0 2G 0 lvm /mnt/lv_mount
├─sdb2 8:18 0 1G 0 part
│ └─vg_test-lv_test 253:0 0 2G 0 lvm /mnt/lv_mount
└─sdb3 8:19 0 1G 0 part
└─vg_test-lv_test 253:0 0 2G 0 lvm /mnt/lv_mount接下来，我们看一下当前系统挂载情况，如下：
[root@host1 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 24401264 3626304 20774960 15% /
devtmpfs 485308 0 485308 0% /dev
tmpfs 499980 88 499892 1% /dev/shm
tmpfs 499980 7304 492676 2% /run
tmpfs 499980 0 499980 0% /sys/fs/cgroup
/dev/sda3 24401264 32944 24368320 1% /APP
/dev/sda1 484004 163704 320300 34% /boot
tmpfs 100000 8 99992 1% /run/user/0
/dev/mapper/vg_test-lv_test 1998672 6144 1871288 1% /mnt/lv_mount2.通过上面的信息，我们看到当前系统内存在逻辑卷lv_test，即目标迁移逻辑卷。为了更好的体现迁移成功与否，我们向该逻辑卷写入500MB的文件f1
[root@host1 lv_mount]# dd if=/dev/zero of=f1 bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 3.02218 s, 173 MB/s
[root@host1 lv_mount]# ll
total 512016
-rw-r--r--. 1 root root 524288000 Aug 13 18:27 f1
drwx------. 2 root root 16384 Aug 13 18:11 lost+found3.接下来，我们开始逻辑卷的迁移工作。 由于当前逻辑卷lv_test正在挂载，所以我们需要先执行卸载操作，以保证数据安全和迁移工作的顺利进行
root@host1 ~]# umount /mnt/lv_mount/
[root@host1 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 24401264 3625296 20775968 15% /
devtmpfs 485308 0 485308 0% /dev
tmpfs 499980 88 499892 1% /dev/shm
tmpfs 499980 7304 492676 2% /run
tmpfs 499980 0 499980 0% /sys/fs/cgroup
/dev/sda3 24401264 32944 24368320 1% /APP
/dev/sda1 484004 163704 320300 34% /boot
tmpfs 100000 12 99988 1% /run/user/04.为了避免可能存在的卷名冲突，我们需要重命名逻辑卷和卷组(事实上，由于逻辑卷是附着于卷组的，相对于单个卷组来说具有唯一识别性，所以逻辑卷的名称修改并不是必须的)
[root@host1 ~]# vgrename vg_test vg_new
Volume group "vg_test" successfully renamed to "vg_new"
[root@host1 ~]# lvrename /dev/vg_new/lv_test lv_new
Renamed "lv_test" to "lv_new" in volume group "vg_new"
[root@host1 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_new 3 1 0 wz--n- 2.99g 1012.00m
[root@host1 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv_new vg_new -wi-a----- 2.00g5.接下来，设置卷组为非活动状态
[root@host1 ~]# vgchange -an vg_new
0 logical volume(s) in volume group "vg_new" now active6.输出卷组，使系统不再识别该卷组
[root@host1 ~]# vgexport vg_new
Volume group "vg_new" successfully exported
[root@host1 ~]# vgdisplay
--- Volume group ---
VG Name vg_new
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 5
VG Access read/write
VG Status exported/resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 3
Act PV 3
VG Size 2.99 GiB
PE Size 4.00 MiB
Total PE 765
Alloc PE / Size 512 / 2.00 GiB
Free PE / Size 253 / 1012.00 MiB
VG UUID MPoXHg-wUZB-LcsA-T7y2-5xyA-dDnJ-IsA7iY7.到这里，从宿主机上迁移逻辑卷的操作就基本结束了，但别忘了删除原先的挂载信息，以免开机无法启动
[root@host1 ~]# sed -i.bak '/lv_mount/d' /etc/fstab
[root@host1 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Jul 14 11:15:48 2017
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=afedc130-7796-4497-808c-696143748953 / xfs defaults 0 0
UUID=941d3e57-d5a3-4362-8fd0-beac08d855a4 /APP xfs defaults 0 0
UUID=2e3cbe4a-cc4b-483e-b4e6-35029865dfe8 /boot xfs defaults 0 0
UUID=9c88c881-8c99-4df4-814f-8e47adf83fa8 swap swap defaults 0 0
[root@host1 ~]# ll /etc/|grep fstab
-rw-r--r--. 1 root root 595 Aug 13 21:24 fstab
-rw-r--r--. 1 root root 669 Aug 13 18:15 fstab.bak8.从host1主机中拆除该硬盘
9.向devel主机载入刚从host1主机拆除的硬盘，然后重启(或在终端输入 echo "- - -" >> /sys/class/scsi_host/host2/scan)
10.查看devel主机分区信息
[root@devel ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 476M 0 part /boot
├─sda2 8:2 0 7.5G 0 part [SWAP]
├─sda3 8:3 0 65.2G 0 part /
├─sda4 8:4 0 1K 0 part
├─sda5 8:5 0 9.3G 0 part /mnt/lfs
├─sda6 8:6 0 1G 0 part /mnt/quto
├─sda7 8:7 0 1G 0 part
│ └─md5 9:5 0 2G 0 raid5
├─sda8 8:8 0 1G 0 part
│ └─md1 9:1 0 1023M 0 raid1 /backup
├─sda9 8:9 0 1G 0 part
│ └─md1 9:1 0 1023M 0 raid1 /backup
├─sda10 8:10 0 1G 0 part
│ └─md5 9:5 0 2G 0 raid5
├─sda11 8:11 0 1G 0 part
│ └─md5 9:5 0 2G 0 raid5
├─sda12 8:12 0 1G 0 part
│ └─md5 9:5 0 2G 0 raid5
└─sda13 8:13 0 5G 0 part
sdb 8:16 0 10G 0 disk
├─sdb1 8:17 0 1G 0 part
│ └─vg_new-lv_new 253:0 0 2G 0 lvm
├─sdb2 8:18 0 1G 0 part
│ └─vg_new-lv_new 253:0 0 2G 0 lvm
└─sdb3 8:19 0 1G 0 part
└─vg_new-lv_new 253:0 0 2G 0 lvm11.载入卷组
[root@devel ~]# vgimport vg_new
Volume group "vg_new" successfully imported12.激活卷组(即修改为活动状态)
[root@devel ~]# vgchange -ay vg_new
[root@devel ~]# vgdisplay vg_new
--- Volume group ---
VG Name vg_new
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 3
Act PV 3
VG Size 2.99 GiB
PE Size 4.00 MiB
Total PE 765
Alloc PE / Size 512 / 2.00 GiB
Free PE / Size 253 / 1012.00 MiB
VG UUID MPoXHg-wUZB-LcsA-T7y2-5xyA-dDnJ-IsA7iY13.创建挂载点，并挂载
[root@devel ~]# mkdir /mnt/test_mount
[root@devel ~]# blkid /dev/vg_new/lv_new
/dev/vg_new/lv_new: UUID="dc65b428-5401-48eb-850e-b1d57a52c822" TYPE="ext4"
[root@devel ~]# echo "UUID=dc65b428-5401-48eb-850e-b1d57a52c822 /mnt/test_mount ext4 defaults 0 0" >> /etc/fstab
[root@devel test_mount]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 68325792 30208512 38117280 45% /
devtmpfs 919064 0 919064 0% /dev
tmpfs 933624 88 933536 1% /dev/shm
tmpfs 933624 1132 932492 1% /run
tmpfs 933624 0 933624 0% /sys/fs/cgroup
/dev/sda6 999320 2572 927936 1% /mnt/quto
/dev/sda5 9481408 36900 8939832 1% /mnt/lfs
/dev/md1 1014680 2564 943356 1% /backup
/dev/sda1 484004 217164 266840 45% /boot
/dev/mapper/betavg-betalv 2086912 544944 1541968 27% /mnt/mount
tmpfs 186728 16 186712 1% /run/user/0
/dev/mapper/vg_new-lv_new 1998672 518148 1359284 28% /mnt/test_mount
[root@devel ~]# mount -a14.查看是否迁移成功
[root@devel ~]# cd /mnt/test_mount/
[root@devel test_mount]# ll -h # 我们看到 之前创建的500MB的文件f1完整存在 迁移成功
total 501M
-rw-r--r--. 1 root root 500M Aug 13 18:27 f1
drwx------. 2 root root 16K Aug 13 18:11 lost+found15.迁移完成。
本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2017/08/14，如有侵权请联系 cloudcommunity@tencent.com 删除
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