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linux基于xfs文件系统实现数据备份和恢复

作者:互联网

实战:xfs文件系统的备份和恢复

XFS文件系统

XFS备份 恢复工具

xfsdump的备份级别

首先了解一下xfsdump的备份级别有以下两种,默认为0(即完全备份)

扩展:

环境准备

实验环境

系统CetnOS8 添加一块虚拟硬盘(准备一个测试分区)
正常使用一块磁盘过程如下:
添加磁盘大小:2G ->分区->格式化->挂载

  1. 虚拟机新增2G硬盘
  2. 开机后查看设备
    使用fdisk -l查看新增硬盘
Last login: Tue Oct 20 04:13:20 2020 from 10.0.0.1
[root@C8-3 ~]# fdisk -l
Disk /dev/sda: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xbfcdb101

Device     Boot   Start      End  Sectors Size Id Type
/dev/sda1  *       2048  2099199  2097152   1G 83 Linux
/dev/sda2       2099200 41943039 39843840  19G 8e Linux LVM


Disk /dev/sdb: 2 GiB, 2147483648 bytes, 4194304 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
  1. 给新增硬盘分区
[root@C8-3 ~]# fdisk /dev/sdb #使用fdisk命令分区

Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x467c42d4.

Command (m for help): m #查看有哪些命令可以用

Help:

  DOS (MBR)
   a   toggle a bootable flag
   b   edit nested BSD disklabel
   c   toggle the dos compatibility flag

  Generic
   d   delete a partition
   F   list free unpartitioned space
   l   list known partition types
   n   add a new partition
   p   print the partition table
   t   change a partition type
   v   verify the partition table
   i   print information about a partition

  Misc
   m   print this menu
   u   change display/entry units
   x   extra functionality (experts only)

  Script
   I   load disk layout from sfdisk script file
   O   dump disk layout to sfdisk script file

  Save & Exit
   w   write table to disk and exit
   q   quit without saving changes

  Create a new label
   g   create a new empty GPT partition table
   G   create a new empty SGI (IRIX) partition table
   o   create a new empty DOS partition table
   s   create a new empty Sun partition table


Command (m for help): n #选择新建一个分区
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p #创建主分区
Partition number (1-4, default 1):  #直接回车默认值
First sector (2048-4194303, default 2048):  #起始扇区,回车默认
Last sector, +sectors or +size{K,M,G,T,P} (2048-4194303, default 4194303):  #结束扇区,回车默认分配全部空间

Created a new partition 1 of type 'Linux' and of size 2 GiB.

Command (m for help): w #将以上操作写入硬盘分区表,结束分区
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@C8-3 ~]# lsblk #查看分区是否成功
NAME        MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda           8:0    0  20G  0 disk 
├─sda1        8:1    0   1G  0 part /boot
└─sda2        8:2    0  19G  0 part 
  ├─cl-root 253:0    0  17G  0 lvm  /
  └─cl-swap 253:1    0   2G  0 lvm  [SWAP]
sdb           8:16   0   2G  0 disk 
└─sdb1        8:17   0   2G  0 part  #分区成功但未挂载

  1. 将新建分区格式化为xfs格式
    使用mkfs.xfs格式化新分区
[root@C8-3 ~]# type mkfs.xfs #查看是否有此工具
mkfs.xfs is /usr/sbin/mkfs.xfs
[root@C8-3 ~]# mkfs.xfs --help #查看命令的帮助
mkfs.xfs: invalid option -- '-'
unknown option -- 
Usage: mkfs.xfs
/* blocksize */		[-b size=num]
/* metadata */		[-m crc=0|1,finobt=0|1,uuid=xxx,rmapbt=0|1,reflink=0|1]
/* data subvol */	[-d agcount=n,agsize=n,file,name=xxx,size=num,
			    (sunit=value,swidth=value|su=num,sw=num|noalign),
			    sectsize=num
/* force overwrite */	[-f]
/* inode size */	[-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
			    projid32bit=0|1,sparse=0|1]
/* no discard */	[-K]
/* log subvol */	[-l agnum=n,internal,size=num,logdev=xxx,version=n
			    sunit=value|su=num,sectsize=num,lazy-count=0|1]
/* label */		[-L label (maximum 12 characters)]
/* naming */		[-n size=num,version=2|ci,ftype=0|1]
/* no-op info only */	[-N]
/* prototype file */	[-p fname]
/* quiet */		[-q]
/* realtime subvol */	[-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */	[-s size=num]
/* version */		[-V]
			devicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
      xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).
[root@C8-3 ~]# mkfs.xfs -V #查看命令版本
mkfs.xfs version 5.0.0
[root@C8-3 ~]# mkfs.xfs /dev/sdb1 #格式化新分区
meta-data=/dev/sdb1              isize=512    agcount=4, agsize=131008 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=524032, 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
  1. 查看新分区情况
    使用lsblk及参数-f查看分区情况和文件系统
    *-f, --fs output info about filesystems*
[root@C8-3 ~]# lsblk -f
NAME        FSTYPE      LABEL UUID                                   MOUNTPOINT
sda                                                                  
├─sda1      ext4              8df39f81-d4b1-4881-9bb4-51f8f6ee964a   /boot
└─sda2      LVM2_member       mQQNpB-AMy6-Ad3M-3RNh-NeRf-8tf9-OmosY7 
  ├─cl-root xfs               8dbc40ac-24cf-45c9-8c53-d07ac9cee558   /
  └─cl-swap swap              ffc54438-efdc-45d7-a244-b9e9bfef4930   [SWAP]
sdb                                                                  
└─sdb1      xfs               d549d0dd-23a2-4223-abe5-96055a8f737a 
  1. 创建一个目录并将新分区sdb1挂载到此目录
[root@C8-3 ~]# mkdir /xfsTest
[root@C8-3 ~]# mount /dev/sdb1 /xfsTest/
[root@C8-3 ~]# lsblk
NAME        MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda           8:0    0  20G  0 disk 
├─sda1        8:1    0   1G  0 part /boot
└─sda2        8:2    0  19G  0 part 
  ├─cl-root 253:0    0  17G  0 lvm  /
  └─cl-swap 253:1    0   2G  0 lvm  [SWAP]
sdb           8:16   0   2G  0 disk 
└─sdb1        8:17   0   2G  0 part /xfsTest

创建测试文件和文件夹

[root@C8-3 ~]# rm -rf /xfsTest/*
[root@C8-3 ~]# ls /xfsTest/
[root@C8-3 ~]# cp /etc/passwd /xfsTest/
[root@C8-3 ~]# touch /xfsTest/file{1..3}{a..b}.txt
[root@C8-3 ~]# mkdir -p /xfsTest/m{1..3}/n{a..b}
[root@C8-3 ~]# tree /xfsTest/
/xfsTest/
├── file1a.txt
├── file1b.txt
├── file2a.txt
├── file2b.txt
├── file3a.txt
├── file3b.txt
├── m1
│   ├── na
│   └── nb
├── m2
│   ├── na
│   └── nb
├── m3
│   ├── na
│   └── nb
└── passwd

9 directories, 7 files

备份

使用xfsdump命令进行备份

先查看xfsdump帮助

[root@C8-3 ~]# type xfsdump 
xfsdump is /usr/sbin/xfsdump
[root@C8-3 ~]# xfsdump --help
xfsdump: version 3.1.8 (dump format 3.0)
xfsdump: usage: xfsdump [ -a (dump DMF dualstate files as offline) ]
……

备份整个分区。 (这个功能就像是虚拟机的快照,服务器被黑后,进行快速恢复)

[ -f <destination> … ]
xfsdump -f 备份存放位置 要备份路径或设备文件
注意:备份的路径这里不能写成/xfsTest/。 可以是/dev/sdb1 或/xfsTest

[root@C8-3 ~]# xfsdump -f /opt/dump_sdb1 /dev/sdb1
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.8 (dump format 3.0) - type ^C for status and control

 ============================= dump label dialog ==============================

please enter label for this dump session (timeout in 300 sec)
 -> dump_sdb1 #提示输入,指定备份会话标签
session label entered: "dump_sdb1"

 --------------------------------- end dialog ---------------------------------

xfsdump: level 0 dump of C8-3:/xfsTest
xfsdump: dump date: Tue Oct 20 08:09:38 2020
xfsdump: session id: 3fdced05-235f-4926-9409-7c7e4081da84
xfsdump: session label: "dump_sdb1"
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: 30016 bytes

 ============================= media label dialog =============================

please enter label for media in drive 0 (timeout in 300 sec)
 -> sdb1 #提示输入,指定设备标签,就是对要备份的设备做一个描述
media label entered: "sdb1"

 --------------------------------- end dialog ---------------------------------

xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 32936 bytes
xfsdump: dump size (non-dir files) : 1568 bytes
xfsdump: dump complete: 70 seconds elapsed
xfsdump: Dump Summary:
xfsdump:   stream 0 /opt/dump_sdb1 OK (success)
xfsdump: Dump Status: SUCCESS

免交互自动备份 像虚拟机的快照

[root@C8-3 ~]# time xfsdump -f /opt/dump_sdb1_3 /dev/sdb1 -L dump_1_3 -M 1_3
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.8 (dump format 3.0) - type ^C for status and control
xfsdump: level 0 dump of C8-3:/xfsTest
xfsdump: dump date: Tue Oct 20 08:21:12 2020
xfsdump: session id: 5308f2ab-6d0e-476f-9160-a72a37e56ca9
xfsdump: session label: "dump_1_3"
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: 30016 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 32936 bytes
xfsdump: dump size (non-dir files) : 1568 bytes
xfsdump: dump complete: 10 seconds elapsed
xfsdump: Dump Summary:
xfsdump:   stream 0 /opt/dump_sdb1_3 OK (success)
xfsdump: Dump Status: SUCCESS

real	0m10.058s
user	0m0.000s
sys	0m0.004s

-L :xfsdump 记录每次备份的 session 标头,这里可以填写针对此文件系统的简易说明
-M :xfsdump 可以记录储存媒体的标头,这里可以填写此媒体的简易说明

备份指定目录

参数:-s 文件路径 只对指定的文件进行备份,-s指定时,路径写的是相对文件系统根的路径(-s可以是文件或目录)
要对/xfsTest下的m2/nb这个目录(完整路径是/xfsTest/m2/nb 直接写这个不行)进行备份,使用-s 参数

[root@C8-3 ~]# xfsdump -f /opt/dump_m2nb -s m2/nb /xfsTest   -L dump_m2nb -M m2nb 
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.8 (dump format 3.0) - type ^C for status and control
xfsdump: level 0 dump of C8-3:/xfsTest
xfsdump: dump date: Tue Oct 20 10:04:58 2020
xfsdump: session id: 4cd18dc2-9a10-4538-b93c-3d4169c13eae
xfsdump: session label: "dump_m2nb"
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: 21440 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 22592 bytes
xfsdump: dump size (non-dir files) : 0 bytes
xfsdump: dump complete: 10 seconds elapsed
xfsdump: Dump Summary:
xfsdump:   stream 0 /opt/dump_m2nb OK (success)
xfsdump: Dump Status: SUCCESS

查看备份信息与内容

[root@C8-3 xfsTest]# xfsdump -I
file system 0:
	fs id:		d549d0dd-23a2-4223-abe5-96055a8f737a
	session 0:
		mount point:	C8-3:/xfsTest
		device:		C8-3:/dev/sdb1
		time:		Tue Oct 20 08:09:38 2020
		session label:	"dump_sdb1"
		session id:	3fdced05-235f-4926-9409-7c7e4081da84
		level:		0
		resumed:	NO
		subtree:	NO
		streams:	1
		stream 0:
			pathname:	/opt/dump_sdb1
			start:		ino 131 offset 0
			end:		ino 138 offset 0
			interrupted:	NO
			media files:	1
			media file 0:
				mfile index:	0
				mfile type:	data
				mfile size:	32936
				mfile start:	ino 131 offset 0
				mfile end:	ino 138 offset 0
				media label:	"sdb1"
				media id:	77e98c40-d588-4562-b801-6ba7dd2425bf
	session 1:
		mount point:	C8-3:/xfsTest
		device:		C8-3:/dev/sdb1
		time:		Tue Oct 20 08:17:18 2020
		session label:	"dump_passwd"
		session id:	e9970178-7a24-4c9d-b9c0-7e13f8d43c48
		level:		0
		resumed:	NO
		subtree:	NO
		streams:	1
		stream 0:
			pathname:	/opt/dump_sdb1
			start:		ino 0 offset 0
			end:		ino 0 offset 0
			interrupted:	YES
			media files:	0
	session 2:
		mount point:	C8-3:/xfsTest
		device:		C8-3:/dev/sdb1
		time:		Tue Oct 20 08:19:23 2020
		session label:	"dump_12"
		session id:	391b7c46-47f6-4760-b454-c7835045db09
		level:		0
		resumed:	NO
		subtree:	NO
		streams:	1
		stream 0:
			pathname:	/opt/dump_sdb1
			start:		ino 0 offset 0
			end:		ino 0 offset 0
			interrupted:	YES
			media files:	0
	session 3:
		mount point:	C8-3:/xfsTest
		device:		C8-3:/dev/sdb1
		time:		Tue Oct 20 08:20:12 2020
		session label:	"dump_12"
		session id:	d6613e91-8c68-4f40-b68b-e836fdf35568
		level:		0
		resumed:	NO
		subtree:	NO
		streams:	1
		stream 0:
			pathname:	/opt/dump_sdb1_1
			start:		ino 131 offset 0
			end:		ino 138 offset 0
			interrupted:	NO
			media files:	1
			media file 0:
				mfile index:	0
				mfile type:	data
				mfile size:	32936
				mfile start:	ino 131 offset 0
				mfile end:	ino 138 offset 0
				media label:	"12"
				media id:	f85b0aff-d362-429c-9804-0ca1071f812f
	session 4:
		mount point:	C8-3:/xfsTest
		device:		C8-3:/dev/sdb1
		time:		Tue Oct 20 08:21:12 2020
		session label:	"dump_1_3"
		session id:	5308f2ab-6d0e-476f-9160-a72a37e56ca9
		level:		0
		resumed:	NO
		subtree:	NO
		streams:	1
		stream 0:
			pathname:	/opt/dump_sdb1_3
			start:		ino 131 offset 0
			end:		ino 138 offset 0
			interrupted:	NO
			media files:	1
			media file 0:
				mfile index:	0
				mfile type:	data
				mfile size:	32936
				mfile start:	ino 131 offset 0
				mfile end:	ino 138 offset 0
				media label:	"1_3"
				media id:	78304c29-4353-4edc-a3cb-63454d898918
xfsdump: Dump Status: SUCCESS

删除已备份的文件

[root@C8-3 xfsTest]# cd
[root@C8-3 ~]# rm -rf /xfsTest/*
[root@C8-3 ~]# ls -a /xfsTest/

恢复文件系统

语法:xfsrestore -f 指定恢复文件的位置 指定存放恢复后的文件的路径

[root@C8-3 ~]# mkdir /xfsTest-re #在其他分区创建恢复文件夹
[root@C8-3 ~]# xfsrestore -f /opt/dump_sdb1 /xfsTest-re
xfsrestore: using file dump (drive_simple) strategy
xfsrestore: version 3.1.8 (dump format 3.0) - type ^C for status and control
xfsrestore: searching media for dump
xfsrestore: examining media file 0
xfsrestore: dump description: 
xfsrestore: hostname: C8-3
xfsrestore: mount point: /xfsTest
xfsrestore: volume: /dev/sdb1
xfsrestore: session time: Tue Oct 20 08:09:38 2020
xfsrestore: level: 0
xfsrestore: session label: "dump_sdb1"
xfsrestore: media label: "sdb1"
xfsrestore: file system id: d549d0dd-23a2-4223-abe5-96055a8f737a
xfsrestore: session id: 3fdced05-235f-4926-9409-7c7e4081da84
xfsrestore: media id: 77e98c40-d588-4562-b801-6ba7dd2425bf
xfsrestore: using online session inventory
xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsrestore: 10 directories and 16 entries processed
xfsrestore: directory post-processing
xfsrestore: restoring non-directory files
xfsrestore: restore complete: 0 seconds elapsed
xfsrestore: Restore Summary:
xfsrestore:   stream 0 /opt/dump_sdb1 OK (success)
xfsrestore: Restore Status: SUCCESS
[root@C8-3 ~]# ll /xfsTest-re/ #查看恢复的文件
total 4
-rw-r--r--. 1 root root    0 Oct 20 07:58 file1a.txt
-rw-r--r--. 1 root root    0 Oct 20 07:58 file1b.txt
-rw-r--r--. 1 root root    0 Oct 20 07:58 file2a.txt
-rw-r--r--. 1 root root    0 Oct 20 07:58 file2b.txt
-rw-r--r--. 1 root root    0 Oct 20 07:58 file3a.txt
-rw-r--r--. 1 root root    0 Oct 20 07:58 file3b.txt
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m1
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m2
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m3
-rw-r--r--. 1 root root 1469 Oct 20 07:58 passwd
[root@C8-3 ~]# tree /xfsTest #对比源目录啥也没有了
/xfsTest

0 directories, 0 files
[root@C8-3 ~]# tree /xfsTest-re/ #在恢复的目录中重建了目录结构
/xfsTest-re/
├── file1a.txt
├── file1b.txt
├── file2a.txt
├── file2b.txt
├── file3a.txt
├── file3b.txt
├── m1
│   ├── na
│   └── nb
├── m2
│   ├── na
│   └── nb
├── m3
│   ├── na
│   └── nb
└── passwd

9 directories, 7 files

注:

使用 xfsdump 时,请注意下面下面的几个限制:

  1. xfsdump 不支持没有挂载的文件系统备份!所以只能备份已挂载的!
  2. xfsdump 必须使用 root 的权限才能操作 (涉及文件系统的关系)
  3. xfsdump 只能备份 XFS 文件系统
  4. xfsdump 备份下来的数据 (档案或储存媒体) 只能让 xfsrestore 解析
  5. xfsdump 是透过文件系统的 UUID 来分辨各个备份档的,因此不能备份两个具有相同 UUID 的文件系统

增量备份

概念

增量备份是指在一次全备份或上一次增量备份后,以后每次的备份只需备份与前一次相比增加或者被修改的文件。这就意味着,第一次增量备份的对象是进行全备后所产生的增加和修改的文件;第二次增量备份的对象是进行第一次增量备份后所产生的增加和修改的文件,以此类推。  

优缺点

准备一个需要备份的目录

[root@C8-3 ~]# tree /xfsTest
/xfsTest
├── m1
│   ├── na
│   └── nb
├── m2
│   ├── na
│   └── nb
├── m3
│   ├── na
│   └── nb
└── passwd

进行一次全面备份

[root@C8-3 ~]# xfsdump -f /opt/xFull /xfsTest -L xF1 -M x1
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.8 (dump format 3.0) - type ^C for status and control
xfsdump: level 0 dump of C8-3:/xfsTest
xfsdump: dump date: Tue Oct 20 10:43:59 2020
xfsdump: session id: 4bc4262b-afa1-493f-8b21-33428325961d
xfsdump: session label: "xF1"
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: 28096 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 29000 bytes
xfsdump: dump size (non-dir files) : 1568 bytes
xfsdump: dump complete: 10 seconds elapsed
xfsdump: Dump Summary:
xfsdump:   stream 0 /opt/xFull OK (success)
xfsdump: Dump Status: SUCCESS

添加一些东西进去

[root@C8-3 ~]# echo hellow >> /xfsTest/passwd
[root@C8-3 ~]# touch /xfsTest/nb3.txt

删掉一些东西

[root@C8-3 ~]# rm -rf /xfsTest/m2
[root@C8-3 ~]# ls /xfsTest
m1  m3  nb3.txt  passwd
[root@C8-3 ~]# ll /xfsTest
total 4
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m1
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m3
-rw-r--r--. 1 root root    0 Oct 20 10:47 nb3.txt
-rw-r--r--. 1 root root 1476 Oct 20 10:46 passwd

进行第一次增量备份

[root@C8-3 ~]# xfsdump -l 1 -f /opt/xBL1 /xfsTest -L xBL1 -M xB1

进行第二次增量备份

添加点东西、再删点东西

[root@C8-3 ~]# mkdir /xfsTest/xBl2
[root@C8-3 ~]# rm -rf /xfsTest/m3

然后接茬进行一次2级增量备份

[root@C8-3 ~]# xfsdump -l 2 -f /opt/xBL2 /xfsTest -L xBL2 -M xB2

删除已备份的所有数据

[root@C8-3 ~]# rm -rf /xfsTest/*
[root@C8-3 ~]# ll /xfsTest
total 0

恢复数据

现在进行恢复,要想恢复全部全部数据,包括新添加的文件,如何恢复?
步骤:
1、先恢复完全备份
2、情况1: 恢复最后一次增量备份(如果两次增量备份都是1级的,所以只需要恢复最后一个增量就可以了。
3、情况2:如果你做的是第一次是1级备,第二次是2级备,那么你在恢复的时候就需要先恢复完全备份,然后是1级备,最后是2级备)

####直接恢复最后一次增量备份

[root@C8-3 ~]# xfsrestore -f /opt/xBL2 /xfsTest
[root@C8-3 ~]# tree /xfsTest
/xfsTest
└── xBl2

发现只恢复了最后一次建立的文件夹

直接恢复第一次增量备份

[root@C8-3 ~]# rm -rf /xfsTest/*
[root@C8-3 ~]# ll /xfsTest
total 0
[root@C8-3 ~]# xfsrestore -f /opt/xBL1 /xfsTest
[root@C8-3 ~]# tree /xfsTest
/xfsTest
├── nb3.txt
└── passwd

发现只恢复了第一次增量备份前添加和修改的文件、文件夹

直接恢复第一次全备份

[root@C8-3 ~]# xfsrestore -f /opt/xFull /xfsTest
[root@C8-3 ~]# tree /xfsTest
/xfsTest
├── m1
│   ├── na
│   └── nb
├── m2
│   ├── na
│   └── nb
├── m3
│   ├── na
│   └── nb
└── passwd

9 directories, 1 file
[root@C8-3 ~]# ll /xfsTest
total 4
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m1
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m2
drwxr-xr-x. 4 root root   26 Oct 20 07:59 m3
-rw-r--r--. 1 root root 1469 Oct 20 07:58 passwd

这时候就恢复到了第一次增量备份之前的状态

如果要恢复到最后删除所有文件时候的状态,就需要按顺序依次恢复增量一和增量二的备份内容。

到此,数据恢复成功了。

标签:xfsTest,dump,备份,数据备份,C8,linux,xfsdump,xfs,root
来源: https://blog.csdn.net/timonium/article/details/120191227