Имеется иходный образ vagrant с centos/7 1804.2 с несколькими дисками:
Вывод команды 'lsblk'
[vagrant@lvm ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 39G 0 part
├─VolGroup00-LogVol00 253:0 0 37.5G 0 lvm /
└─VolGroup00-LogVol01 253:1 0 1.5G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
sdc 8:32 0 2G 0 disk
sdd 8:48 0 1G 0 disk
sde 8:64 0 1G 0 disk
Подготовим временный том для раздела "/" на устройстве /dev/sdb, для этого:
- создадим на нём Physical volume
[vagrant@lvm ~]$ sudo -i [root@lvm ~]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created. - создадим Volume group
[root@lvm ~]# vgcreate vg_root /dev/sdb Volume group "vg_root" successfully created - создадим логический раздел "lv_root" использую всё свободное место
[root@lvm ~]# lvcreate -n lv_root -l +100%FREE /dev/vg_root Logical volume "lv_root" created.
Проверим резульат (вывод команды 'lsblk')
[root@lvm ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 39G 0 part
├─VolGroup00-LogVol00 253:0 0 37.5G 0 lvm /
└─VolGroup00-LogVol01 253:1 0 1.5G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
└─vg_root-lv_root 253:2 0 10G 0 lvm
sdc 8:32 0 2G 0 disk
sdd 8:48 0 1G 0 disk
sde 8:64 0 1G 0 disk
Теперь создадим файловую систему на этом новом разделе:
[root@lvm ~]# mkfs.xfs /dev/vg_root/lv_root
meta-data=/dev/vg_root/lv_root isize=512 agcount=4, agsize=655104 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=2620416, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
и промонтируем её в /mnt
[root@lvm ~]# mount /dev/vg_root/lv_root /mnt
Сейчас раздел "/" находится на файловой системе xfs. Чтобы скопировать его на в /mnt следует установить утилиту xfsdump
Установка `xfsdump`
[root@lvm ~]# yum install xfsdump
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.docker.ru
* extras: mirrors.powernet.com.ru
* updates: mirrors.powernet.com.ru
Resolving Dependencies
--> Running transaction check
---> Package xfsdump.x86_64 0:3.1.7-3.el7_9 will be installed
--> Processing Dependency: attr >= 2.0.0 for package: xfsdump-3.1.7-3.el7_9.x86_64
--> Running transaction check
---> Package attr.x86_64 0:2.4.46-13.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================================================================
Package Arch Version Repository Size
============================================================================================================================================
Installing:
xfsdump x86_64 3.1.7-3.el7_9 updates 309 k
Installing for dependencies:
attr x86_64 2.4.46-13.el7 base 66 k
Transaction Summary
============================================================================================================================================
Install 1 Package (+1 Dependent package)
Total download size: 374 k
Installed size: 1.1 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): attr-2.4.46-13.el7.x86_64.rpm | 66 kB 00:00:00
(2/2): xfsdump-3.1.7-3.el7_9.x86_64.rpm | 309 kB 00:00:00
--------------------------------------------------------------------------------------------------------------------------------------------
Total 660 kB/s | 374 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : attr-2.4.46-13.el7.x86_64 1/2
Installing : xfsdump-3.1.7-3.el7_9.x86_64 2/2
Verifying : attr-2.4.46-13.el7.x86_64 1/2
Verifying : xfsdump-3.1.7-3.el7_9.x86_64 2/2
Installed:
xfsdump.x86_64 0:3.1.7-3.el7_9
Dependency Installed:
attr.x86_64 0:2.4.46-13.el7
Complete!
Скопируем раздел "/" в /mnt
[root@lvm ~]# xfsdump -J - /dev/VolGroup00/LogVol00 | xfsrestore -J - /mnt
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.7 (dump format 3.0)
xfsdump: level 0 dump of lvm:/
xfsdump: dump date: Wed Dec 13 18:34:36 2023
xfsdump: session id: db2721d5-adac-4cb1-a915-54c23a4a6fa4
xfsdump: session label: ""
xfsrestore: using file dump (drive_simple) strategy
xfsrestore: version 3.1.7 (dump format 3.0)
xfsrestore: searching media for dump
xfsdump: ino map phase 1: constructing initial dump list
xfsdump: ino map phase 2: skipping (no pruning necessary)
xfsdump: ino map phase 3: skipping (only one dump stream)
xfsdump: ino map construction complete
xfsdump: estimated dump size: 881359040 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsrestore: examining media file 0
xfsrestore: dump description:
xfsrestore: hostname: lvm
xfsrestore: mount point: /
xfsrestore: volume: /dev/mapper/VolGroup00-LogVol00
xfsrestore: session time: Wed Dec 13 18:34:36 2023
xfsrestore: level: 0
xfsrestore: session label: ""
xfsrestore: media label: ""
xfsrestore: file system id: b60e9498-0baa-4d9f-90aa-069048217fee
xfsrestore: session id: db2721d5-adac-4cb1-a915-54c23a4a6fa4
xfsrestore: media id: 7852300a-0915-4f4f-ad75-f4d14255fa4f
xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsdump: dumping non-directory files
xfsrestore: 2699 directories and 23623 entries processed
xfsrestore: directory post-processing
xfsrestore: restoring non-directory files
xfsdump: ending media file
xfsdump: media file size 858399608 bytes
xfsdump: dump size (non-dir files) : 845225248 bytes
xfsdump: dump complete: 15 seconds elapsed
xfsdump: Dump Status: SUCCESS
xfsrestore: restore complete: 15 seconds elapsed
xfsrestore: Restore Status: SUCCESS
Теперь сделаем синонимы в /mnt для каталогов /proc, /sys, /dev, /run и /boot
[root@lvm ~]# for i in /proc/ /sys/ /dev/ /run/ /boot/; do mount --bind $i /mnt/$i; done
... и сделаем chroot в каталог /mnt
[root@lvm ~]# chroot /mnt/
[root@lvm /]#
Теперь обновим grub
[root@lvm /]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-862.2.3.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.2.3.el7.x86_64.img
done
... и обновим образ initrd
[root@lvm /]# cd /boot ; for i in `ls initramfs-*img`; do dracut -v $i `echo $i|sed "s/initramfs-//g; s/.img//g"` --force; done
Executing: /sbin/dracut -v initramfs-3.10.0-862.2.3.el7.x86_64.img 3.10.0-862.2.3.el7.x86_64 --force
dracut module 'busybox' will not be installed, because command 'busybox' could not be found!
dracut module 'crypt' will not be installed, because command 'cryptsetup' could not be found!
dracut module 'dmraid' will not be installed, because command 'dmraid' could not be found!
dracut module 'dmsquash-live-ntfs' will not be installed, because command 'ntfs-3g' could not be found!
dracut module 'multipath' will not be installed, because command 'multipath' could not be found!
dracut module 'busybox' will not be installed, because command 'busybox' could not be found!
dracut module 'crypt' will not be installed, because command 'cryptsetup' could not be found!
dracut module 'dmraid' will not be installed, because command 'dmraid' could not be found!
dracut module 'dmsquash-live-ntfs' will not be installed, because command 'ntfs-3g' could not be found!
dracut module 'multipath' will not be installed, because command 'multipath' could not be found!
*** Including module: bash ***
*** Including module: nss-softokn ***
*** Including module: i18n ***
*** Including module: drm ***
*** Including module: plymouth ***
*** Including module: dm ***
Skipping udev rule: 64-device-mapper.rules
Skipping udev rule: 60-persistent-storage-dm.rules
Skipping udev rule: 55-dm.rules
*** Including module: kernel-modules ***
Omitting driver floppy
*** Including module: lvm ***
Skipping udev rule: 64-device-mapper.rules
Skipping udev rule: 56-lvm.rules
Skipping udev rule: 60-persistent-storage-lvm.rules
*** Including module: qemu ***
*** Including module: resume ***
*** Including module: rootfs-block ***
*** Including module: terminfo ***
*** Including module: udev-rules ***
Skipping udev rule: 40-redhat-cpu-hotplug.rules
Skipping udev rule: 91-permissions.rules
*** Including module: biosdevname ***
*** Including module: systemd ***
*** Including module: usrmount ***
*** Including module: base ***
*** Including module: fs-lib ***
*** Including module: shutdown ***
*** Including modules done ***
*** Installing kernel module dependencies and firmware ***
*** Installing kernel module dependencies and firmware done ***
*** Resolving executable dependencies ***
*** Resolving executable dependencies done***
*** Hardlinking files ***
*** Hardlinking files done ***
*** Stripping files ***
*** Stripping files done ***
*** Generating early-microcode cpio image contents ***
*** No early-microcode cpio image needed ***
*** Store current command line parameters ***
*** Creating image file ***
*** Creating image file done ***
*** Creating initramfs image file '/boot/initramfs-3.10.0-862.2.3.el7.x86_64.img' done ***
В файле /boot/grub2/grub.cfg меняем rd.lvm.lv=VolGroup00/LogVol00 на rd.lvm.lv=vg_root/lv_root для того, чтобы "/" при загрузке примнтировался из нашего временного раздела lv_root
[root@lvm boot]# sed -i 's/rd.lvm.lv=VolGroup00\/LogVol00/rd.lvm.lv=vg_root\/lv_root/g' /boot/grub2/grub.cfg
Теперь перезагружаемся и проверяем вывод lsblk
[root@lvm boot]# reboot
Connection to 127.0.0.1 closed by remote host.
user@intel:~/Nextcloud/Документы/OTUS/OTUS-Task3/vagrant$ vagrant ssh
Last login: Wed Dec 13 18:06:10 2023 from 10.0.2.2
[vagrant@lvm ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 39G 0 part
├─VolGroup00-LogVol01 253:1 0 1.5G 0 lvm [SWAP]
└─VolGroup00-LogVol00 253:2 0 37.5G 0 lvm
sdb 8:16 0 10G 0 disk
└─vg_root-lv_root 253:0 0 10G 0 lvm /
sdc 8:32 0 2G 0 disk
sdd 8:48 0 1G 0 disk
sde 8:64 0 1G 0 disk
Видим, что раздел "/" примонтирован с устройства sdb. Теперь можно уменьшить раздел VolGroup00-LogVol00, а именно удалим его и создадим новый нужного размера
[root@lvm ~]# lvremove /dev/VolGroup00/LogVol00
Do you really want to remove active logical volume VolGroup00/LogVol00? [y/n]: y
Logical volume "LogVol00" successfully removed
[root@lvm ~]# lvcreate -n VolGroup00/LogVol00 -L 8G /dev/VolGroup00
WARNING: xfs signature detected on /dev/VolGroup00/LogVol00 at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/VolGroup00/LogVol00.
Logical volume "LogVol00" created.
Создадим на нём файловую систему
[root@lvm ~]# mkfs.xfs /dev/VolGroup00/LogVol00
meta-data=/dev/VolGroup00/LogVol00 isize=512 agcount=4, agsize=524288 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=2097152, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
и примонтируем его в /mnt
[root@lvm ~]# mount /dev/VolGroup00/LogVol00 /mnt
Переносим "/" на новый раздел
[root@lvm ~]# xfsdump -J - /dev/vg_root/lv_root | xfsrestore -J - /mnt
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.7 (dump format 3.0)
xfsdump: level 0 dump of lvm:/
xfsdump: dump date: Wed Dec 13 19:05:26 2023
xfsdump: session id: 4b743b10-fab8-421b-927d-18b20abe1dbe
xfsdump: session label: ""
xfsrestore: using file dump (drive_simple) strategy
xfsrestore: version 3.1.7 (dump format 3.0)
xfsrestore: searching media for dump
xfsdump: ino map phase 1: constructing initial dump list
xfsdump: ino map phase 2: skipping (no pruning necessary)
xfsdump: ino map phase 3: skipping (only one dump stream)
xfsdump: ino map construction complete
xfsdump: estimated dump size: 879972096 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsrestore: examining media file 0
xfsrestore: dump description:
xfsrestore: hostname: lvm
xfsrestore: mount point: /
xfsrestore: volume: /dev/mapper/vg_root-lv_root
xfsrestore: session time: Wed Dec 13 19:05:26 2023
xfsrestore: level: 0
xfsrestore: session label: ""
xfsrestore: media label: ""
xfsrestore: file system id: c4554ef3-68d2-4fb3-b961-3308a6a0715f
xfsrestore: session id: 4b743b10-fab8-421b-927d-18b20abe1dbe
xfsrestore: media id: 0d65bd11-b6c7-475f-b10c-021399677da2
xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsdump: dumping non-directory files
xfsrestore: 2703 directories and 23628 entries processed
xfsrestore: directory post-processing
xfsrestore: restoring non-directory files
xfsdump: ending media file
xfsdump: media file size 857025176 bytes
xfsdump: dump size (non-dir files) : 843847120 bytes
xfsdump: dump complete: 20 seconds elapsed
xfsdump: Dump Status: SUCCESS
xfsrestore: restore complete: 20 seconds elapsed
xfsrestore: Restore Status: SUCCESS
Создадим синонимы для основных каталогов
[root@lvm ~]# for i in /proc/ /sys/ /dev/ /run/ /boot/; do mount --bind $i /mnt/$i; done
Сделаем chroot в /mnt и снова переконфигурируем grub и initrd
[root@lvm ~]# chroot /mnt/
[root@lvm /]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-862.2.3.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.2.3.el7.x86_64.img
done
[root@lvm /]# cd /boot ; for i in `ls initramfs-*img`; do dracut -v $i `echo $i|sed "s/initramfs-//g; s/.img//g"` --force; done
Executing: /sbin/dracut -v initramfs-3.10.0-862.2.3.el7.x86_64.img 3.10.0-862.2.3.el7.x86_64 --force
dracut module 'busybox' will not be installed, because command 'busybox' could not be found!
dracut module 'crypt' will not be installed, because command 'cryptsetup' could not be found!
dracut module 'dmraid' will not be installed, because command 'dmraid' could not be found!
dracut module 'dmsquash-live-ntfs' will not be installed, because command 'ntfs-3g' could not be found!
dracut module 'multipath' will not be installed, because command 'multipath' could not be found!
dracut module 'busybox' will not be installed, because command 'busybox' could not be found!
dracut module 'crypt' will not be installed, because command 'cryptsetup' could not be found!
dracut module 'dmraid' will not be installed, because command 'dmraid' could not be found!
dracut module 'dmsquash-live-ntfs' will not be installed, because command 'ntfs-3g' could not be found!
dracut module 'multipath' will not be installed, because command 'multipath' could not be found!
*** Including module: bash ***
*** Including module: nss-softokn ***
*** Including module: i18n ***
*** Including module: drm ***
*** Including module: plymouth ***
*** Including module: dm ***
Skipping udev rule: 64-device-mapper.rules
Skipping udev rule: 60-persistent-storage-dm.rules
Skipping udev rule: 55-dm.rules
*** Including module: kernel-modules ***
Omitting driver floppy
*** Including module: lvm ***
Skipping udev rule: 64-device-mapper.rules
Skipping udev rule: 56-lvm.rules
Skipping udev rule: 60-persistent-storage-lvm.rules
*** Including module: qemu ***
*** Including module: resume ***
*** Including module: rootfs-block ***
*** Including module: terminfo ***
*** Including module: udev-rules ***
Skipping udev rule: 40-redhat-cpu-hotplug.rules
Skipping udev rule: 91-permissions.rules
*** Including module: biosdevname ***
*** Including module: systemd ***
*** Including module: usrmount ***
*** Including module: base ***
*** Including module: fs-lib ***
*** Including module: shutdown ***
*** Including modules done ***
*** Installing kernel module dependencies and firmware ***
*** Installing kernel module dependencies and firmware done ***
*** Resolving executable dependencies ***
*** Resolving executable dependencies done***
*** Hardlinking files ***
*** Hardlinking files done ***
*** Stripping files ***
*** Stripping files done ***
*** Generating early-microcode cpio image contents ***
*** No early-microcode cpio image needed ***
*** Store current command line parameters ***
*** Creating image file ***
*** Creating image file done ***
*** Creating initramfs image file '/boot/initramfs-3.10.0-862.2.3.el7.x86_64.img' done ***
Теперь можно перезагрузиться, но сначала выполним другие задания.
Сначала перенесём /var. Для этого создадим lvm-зеркало на дисках /dev/sdc и /dev/sdd
[root@lvm boot]# pvcreate /dev/sdc /dev/sdd
Physical volume "/dev/sdc" successfully created.
Physical volume "/dev/sdd" successfully created.
[root@lvm boot]# vgcreate vg_var /dev/sdc /dev/sdd
Volume group "vg_var" successfully created
[root@lvm boot]# lvcreate -L 950M -m1 -n lv_var vg_var
Rounding up size to full physical extent 952.00 MiB
Logical volume "lv_var" created.
Теперь создадим на новом разделе файловую систему ext4, примонтируем её в /mnt и скопируем туда каталог /var
[root@lvm boot]# mkfs.ext4 /dev/vg_var/lv_var
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
60928 inodes, 243712 blocks
12185 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=249561088
8 block groups
32768 blocks per group, 32768 fragments per group
7616 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
[root@lvm boot]# mount /dev/vg_var/lv_var /mnt
[root@lvm boot]# cp -aR /var/* /mnt/
Создадим в /tmp каталог oldvar и переместим туда старый /var
[root@lvm boot]# mkdir /tmp/oldvar && mv /var/* /tmp/oldvar
Теперь отмонтируем новый раздел, куда скопирован /var от /mnt и примонтируем его на место, в /var
[root@lvm boot]# umount /mnt
[root@lvm boot]# mount /dev/vg_var/lv_var /var
Чтобы после перезагрузки /var примонтровался с нужного раздела, получим UUID, сформируем строку для fstab и добавим её в /etc/fstab
[root@lvm boot]# echo "`blkid | grep var: | awk '{print $2}'` /var ext4 defaults 0 0" >> /etc/fstab
Выходим из /chroot, перезагружаемся и удаляем не нужный больше раздел lv_root
[vagrant@lvm ~]$ sudo -i
[root@lvm ~]# lvremove /dev/vg_root/lv_root
Do you really want to remove active logical volume vg_root/lv_root? [y/n]: y
Logical volume "lv_root" successfully removed
[root@lvm ~]# vgremove /dev/vg_root
Volume group "vg_root" successfully removed
[root@lvm ~]# pvremove /dev/sdb
Labels on physical volume "/dev/sdb" successfully wiped.
[root@lvm ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 39G 0 part
├─VolGroup00-LogVol00 253:0 0 8G 0 lvm /
└─VolGroup00-LogVol01 253:1 0 1.5G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
sdc 8:32 0 2G 0 disk
├─vg_var-lv_var_rmeta_0 253:2 0 4M 0 lvm
│ └─vg_var-lv_var 253:7 0 952M 0 lvm /var
└─vg_var-lv_var_rimage_0 253:3 0 952M 0 lvm
└─vg_var-lv_var 253:7 0 952M 0 lvm /var
sdd 8:48 0 1G 0 disk
├─vg_var-lv_var_rmeta_1 253:5 0 4M 0 lvm
│ └─vg_var-lv_var 253:7 0 952M 0 lvm /var
└─vg_var-lv_var_rimage_1 253:6 0 952M 0 lvm
└─vg_var-lv_var 253:7 0 952M 0 lvm /var
sde 8:64 0 1G 0 disk
Сдедаем том для /home
[root@lvm ~]# lvcreate -n LogVol_Home -L 2G /dev/VolGroup00
Logical volume "LogVol_Home" created.
Создадим файловую систему на томе
[root@lvm ~]# mkfs.xfs /dev/VolGroup00/LogVol_Home
meta-data=/dev/VolGroup00/LogVol_Home isize=512 agcount=4, agsize=131072 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=524288, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
Примонтируем эту файловую систему в /mnt, скопируем туда каталог /home, удалим всё в старом /home, отмонтируем новый раздел от /mnt и примонтируем его в /home
[root@lvm ~]# mount /dev/VolGroup00/LogVol_Home /mnt/
[root@lvm ~]# cp -aR /home/* /mnt/
[root@lvm ~]# rm -rf /home/*
[root@lvm ~]# umount /mnt
[root@lvm ~]# mount /dev/VolGroup00/LogVol_Home /home/
Добавим соответствующуб запись в fstab
[root@lvm ~]# echo "`blkid | grep Home | awk '{print $2}'` /home xfs defaults 0 0" >> /etc/fstab
Создадим в /home файлы
touch /home/file{1..20}
Снимем снапшот
[root@lvm ~]# lvcreate -L 100MB -s -n home_snap /dev/VolGroup00/LogVol_Home
Rounding up size to full physical extent 128.00 MiB
Logical volume "home_snap" created.
Удалим часть файлов
[root@lvm ~]# rm -f /home/file{11..20}
[root@lvm ~]# ls /home/
file1 file10 file2 file3 file4 file5 file6 file7 file8 file9 vagrant
Теперь отмонтируем /home, восстановим его из снапшота, примонтируем обратно и посмотрим содержимое
[root@lvm ~]# umount /home
[root@lvm ~]# lvconvert --merge /dev/VolGroup00/home_snap
Merging of volume VolGroup00/home_snap started.
VolGroup00/LogVol_Home: Merged: 100.00%
[root@lvm ~]# mount /home
[root@lvm ~]# ls /home/
file1 file11 file13 file15 file17 file19 file20 file4 file6 file8 vagrant
file10 file12 file14 file16 file18 file2 file3 file5 file7 file9
Установим btrfs на устройство /dev/sdb, примонтируем его в /mnt и проверим, что получилось, командой df -T
[root@lvm ~]# mkfs.btrfs /dev/sdb
btrfs-progs v4.9.1
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: 756c0b14-ab12-48c0-8c23-10836049457a
Node size: 16384
Sector size: 4096
Filesystem size: 10.00GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 1.00GiB
System: DUP 8.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
ID SIZE PATH
1 10.00GiB /dev/sdb
[root@lvm ~]# mount /dev/sdb /mnt
[root@lvm ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 xfs 8378368 897416 7480952 11% /
devtmpfs devtmpfs 111876 0 111876 0% /dev
tmpfs tmpfs 120692 0 120692 0% /dev/shm
tmpfs tmpfs 120692 4516 116176 4% /run
tmpfs tmpfs 120692 0 120692 0% /sys/fs/cgroup
/dev/sda2 xfs 1038336 62216 976120 6% /boot
/dev/mapper/vg_var-lv_var ext4 943128 257080 620924 30% /var
/dev/mapper/VolGroup00-LogVol_Home xfs 2086912 32992 2053920 2% /home
/dev/sdb btrfs 10485760 16896 8370944 1% /mnt
Каталог /opt оказался пуст, поэтому просто отмонтируем /dev/sdb от /mnt и примонтируем в /opt /dev/sdb, потом добавим запись в /etc/fstab
[root@lvm ~]# umount /mnt
[root@lvm ~]# mount /dev/sdb /opt/
[root@lvm ~]# echo "`blkid | grep btrfs | awk '{print $2}'` /opt btrfs defaults 0 0" >> /etc/fstab
Проверим, что раздел успешно монтируется
[root@lvm ~]# mount -a
[root@lvm ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 8.0G 877M 7.2G 11% /
devtmpfs 110M 0 110M 0% /dev
tmpfs 118M 0 118M 0% /dev/shm
tmpfs 118M 4.5M 114M 4% /run
tmpfs 118M 0 118M 0% /sys/fs/cgroup
/dev/sda2 1014M 61M 954M 6% /boot
/dev/mapper/vg_var-lv_var 922M 252M 607M 30% /var
/dev/mapper/VolGroup00-LogVol_Home 2.0G 33M 2.0G 2% /home
/dev/sdb 10G 17M 8.0G 1% /opt
Вывод итоговой команды lsblk на скриншоте:
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