大佬教程收集整理的这篇文章主要介绍了迁移数据至逻辑卷和LVM快照,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
[[email protected] ~]# pvcreate /dev/sd{B,c} Physical volume "/dev/sdb" successfully created. Physical volume "/dev/sdc" successfully created. [[email protected] ~]# vgcreate testvg /dev/sd{B,c} Volume group "testvg" successfully created [[email protected] ~]# lvcreate -n testlv -L 5G testvg Logical volume "testlv" created.
[[email protected] ~]# mkfs.ext4 /dev/testvg/testlv mke2fs 1.42.9 (28-Dec-2013) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks,Stripe width=0 blocks 327680 inodes,1310720 blocks 65536 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1342177280 40 block groups 32768 blocks per group,32768 fragments per group 8192 inodes per group Superblock BACkups stored on blocks: 32768,98304,163840,229376,294912,819200,884736 Allocating group tables: done WriTing inode tables: done CreaTing journal (32768 blocks): done WriTing superblocks and filesystem accounTing information: done
[[email protected] ~]# mkdir /testdir [[email protected] ~]# mount /dev/testvg/testlv /testdir/ [[email protected] ~]# cp -a /home/. /testdir/ [[email protected] ~]# ls /testdir lost+found masuri
[[email protected] home]# mv /home/* /tmp/ [[email protected] testdir]# umount /testdir/
[[email protected] home]# vim /etc/fstab # # /etc/fstab # Created by anaconda on Tue Mar 5 21:07:19 2019 # # 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=45490aa4-cf29-420d-a606-af32688b6707 / xfs defaults 0 0 UUID=15dcd896-b7cf-48d0-b8bd-4c0b0f2c62b2 /boot xfs defaults 0 0 UUID=4b6e1813-2c46-402a-869a-02cbbcb76ade /data xfs defaults 0 0 UUID=0995b444-48c1-4423-92bc-2deda0d3c082 swap swap defaults 0 0 UUID=a3fa2d53-91c4-4af5-9ee4-c63500dbaaf2 /home ext4 defaults 0 0 ~ ~ #挂载设备 [[email protected] home]# mount -a #查看设备是否挂载 [[email protected] home]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 200G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 100G 0 part / ├─sda3 8:3 0 50G 0 part /data ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 2G 0 part [SWAP] sdb 8:16 0 20G 0 disk └─testvg-testlv 253:0 0 5G 0 lvm /home sdc 8:32 0 20G 0 disk sr0 11:0 1 10G 0 rom #查看lvm中的数据是否存在 [[email protected] home]# cd /home [[email protected] home]# ls lost+found masuri
lvm快照的原理是在和需要拍摄快照的逻辑卷的同一卷组上创建一个空白逻辑卷并标识当前的时间,当原逻辑卷内的某数据发生改变时,首先会在此数据未发生改变前复制一份至快照卷。当需要用到快照时,系统会将快照卷内的数据全部复制回逻辑卷,并将逻辑卷内拍摄快后建立的数据全部删除。快照卷的大小一般为逻辑卷内数据的大小,过大无意义,过小可能会造成数据的丢失。
此处以刚才创建的逻辑卷/dev/testvg/testlv为例,创建快照
[[email protected] home]# lvcreate -n home_snap -s -L 100M /dev/testvg/testlv Logical volume "home_snap" created. #查看快照卷是否创建 [[email protected] home]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log cpy%sync Convert home_snap testvg swi-a-s--- 100.00m testlv 0.01 testlv testvg owi-aos--- 5.00g
在对逻辑卷恢复之前先将逻辑卷内的数据进行一些修改
[[email protected] ~]# cd /home [[email protected] home]# ls lost+found masuri [[email protected] home]# touch file{1..5} [[email protected] home]# ls file1 file2 file3 file4 file5 lost+found masuri
恢复快照,恢复快照前需要将逻辑卷卸载
[[email protected] ~]# umount /home/ [[email protected] ~]# lvconvert --merge /dev/testvg/home_snap Merging of volume testvg/home_snap started. testvg/testlv: Merged: 100.00%
挂载逻辑卷查看数据是否恢复
[[email protected] ~]# mount -a [[email protected] ~]# cd /home [[email protected] home]# ls lost+found masuri
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