ISCSI存储-数据恢复【CENTOS6.5】

实验OK后留存：环境centos6.5-64

1、原服务器恢复OK：
安装客户端 yum install iscsi-initiator-utils
iscsiadm -m discovery -t sendtargets -p 192.168.122.192
iscsiadm -m node -T iqn...lvm-test -p  192.168.122.192 -l
pvcreate /dev/sda
vgcreate vg-test /dev/sda
lvcreate -L 960 -n lv-test vg-test
mkfs.ext4 /dev/mapper/vg--test-lv--test
mount /dev/mapper/vg--test-lv--test /mnt/lv-test
原系统断网、umount重启系统后的ISCSI存储LVM恢复：
iscsiadm -m session、PV、VG、LV信息都在，但/dev/mapper/无映射，/dev/dm*也没有设备。
运行vgchange -ay vg-test后，/dev/dm*有设备了，/dev/mapper/下映射也恢复了。挂回原来位置，文件全在。
mount /dev/mapper/vg--test-lv--test /mnt/lv-test

2、换服务器恢复OK：
安装客户端 yum install iscsi-initiator-utils
iscsiadm -m discovery -t sendtargets -p 192.168.122.192
iscsiadm -m node -T iqn...lvm-test -p  192.168.122.192 -l
pvs、vgs、lvs都没有原LVM踪影。
vgscan后，发现了vg-test，然后pvs、vgs、lvs都发现了原来的LVM元素。
运行vgchange -ay vg-test后，/dev/dm*有设备了，/dev/mapper/下映射也恢复了。挂回原来位置，文件全在。
mount /dev/mapper/vg--test-lv--test /mnt/lv-test

具体：centos6.5-64
[root@dg1 ~]# yum install iscsi-initiator-utils
Loaded plugins: fastestmirror, refresh-packagekit, security
Determining fastest mirrors
 * base: mirrors.163.com
 * extras: centos.ustc.edu.cn
 * updates: centos.ustc.edu.cn
base                    | 3.7 kB     00:00     
base/primary_db         | 4.7 MB     00:02     
extras                  | 3.4 kB     00:00     
extras/primary_db       |  27 kB     00:00     
updates                 | 3.4 kB     00:00     
updates/primary_db      | 2.4 MB     00:02     
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package iscsi-initiator-utils.x86_64 0:6.2.0.873-27.el6_9 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
========================================================
 Package                    Arch        Version                 Repository                                  Size
=======================================================
Installing:
 iscsi-initiator-utils      x86_64      6.2.0.873-27.el6_9      base      732 k
Transaction Summary
============================================================
Install       1 Package(s)
Total download size: 732 k
Installed size: 2.5 M
Is this ok [y/N]: y
Downloading Packages:
iscsi-initiator-utils-6.2.0.873-27.el6_9.x86_64.rpm  | 732 kB  00:00
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Importing GPG key 0xC105B9DE:
 Userid : CentOS-6 Key (CentOS 6 Official Signing Key)
 Package: centos-release-6-5.el6.centos.11.1.x86_64 (@anaconda-CentOS-201311272149.x86_64/6.5)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : iscsi-initiator-utils-6.2.0.873-27.el6_9.x86_64  1/1
  Verifying  : iscsi-initiator-utils-6.2.0.873-27.el6_9.x86_64  1/1
Installed:
  iscsi-initiator-utils.x86_64 0:6.2.0.873-27.el6_9  
Complete!
[root@dg1 ~]# iscsiadm -m discoveryy -t sendtargets -p 192.168.122.192
Try `iscsiadm --help' for more information.
[root@dg1 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.122.192
Starting iscsid: [  OK  ]
192.168.122.192:3260,1 iqn.2006-01.com.openfiler:tsn.lvm-test
192.168.122.192:3260,1 iqn.2006-01.com.openfiler:tsn.JustTestIscsi
192.168.122.192:3260,1 iqn.2006-01.com.openfiler:tsn.ea38368c6e0e
[root@dg1 ~]# iscsiadm -m node -T iqn.2006-01.com.openfiler:tsn.lvm-test -p 192.168.122.192 -l
Logging in to [iface: default, target: iqn.2006-01.com.openfiler:tsn.lvm-test, portal: 192.168.122.192,3260] (multiple)
Login to [iface: default, target: iqn.2006-01.com.openfiler:tsn.lvm-test, portal: 192.168.122.192,3260] successful.
[root@dg1 ~]# iscsiadm -m session
tcp: [1] 192.168.122.192:3260,1 iqn.2006-01.com.openfiler:tsn.lvm-test (non-flash)
[root@dg1 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  vg_dg1   1   2   0 wz--n- 39.51g    0
[root@dg1 ~]# pvs
  PV         VG     Fmt  Attr PSize  PFree
  /dev/sda2  vg_dg1 lvm2 a--  39.51g    0
[root@dg1 ~]# lvs
  LV      VG     Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  lv_root vg_dg1 -wi-ao---- 35.57g    
  lv_swap vg_dg1 -wi-ao----  3.94g  
[root@dg1 ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vg-test" using metadata type lvm2
  Found volume group "vg_dg1" using metadata type lvm2
[root@dg1 ~]# vgimport vg-test
  Volume group "vg-test" is not exported
[root@dg1 ~]# pvscan
  PV /dev/sdb    VG vg-test   lvm2 [956.00 MiB / 56.00 MiB free]
  PV /dev/sda2   VG vg_dg1    lvm2 [39.51 GiB / 0    free]
  Total: 2 [40.44 GiB] / in use: 2 [40.44 GiB] / in no VG: 0 [0   ]
[root@dg1 ~]# pv
pvchange   pvcreate   pvmove     pvresize   pvscan     
pvck       pvdisplay  pvremove   pvs        pv.sh      
[root@dg1 ~]# pvs
  PV         VG      Fmt  Attr PSize   PFree
  /dev/sda2  vg_dg1  lvm2 a--   39.51g     0
  /dev/sdb   vg-test lvm2 a--  956.00m 56.00m
[root@dg1 ~]# vgs
  VG      #PV #LV #SN Attr   VSize   VFree
  vg-test   1   1   0 wz--n- 956.00m 56.00m
  vg_dg1    1   2   0 wz--n-  39.51g     0
[root@dg1 ~]# lvs
  LV      VG      Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert
  lv-test vg-test -wi------- 900.00m   
  lv_root vg_dg1  -wi-ao----  35.57g 
  lv_swap vg_dg1  -wi-ao----   3.94g  
[root@dg1 ~]# vgchange -ay vg-test
  1 logical volume(s) in volume group "vg-test" now active
[root@dg1 ~]# ll /dev/mapper/
total 0
crw-rw----. 1 root root 10, 58 Dec 11 14:30 control
lrwxrwxrwx. 1 root root      7 Dec 11 14:30 vg_dg1-lv_root -> ../dm-0
lrwxrwxrwx. 1 root root      7 Dec 11 14:30 vg_dg1-lv_swap -> ../dm-1
lrwxrwxrwx. 1 root root      7 Dec 11 14:41 vg--test-lv--test -> ../dm-2
[root@dg1 ~]# mkdir /mnt/lv-test
[root@dg1 ~]# mount /dev/mapper/vg--test-lv--test /mnt/lv-test/
[root@dg1 ~]# cat /mnt/lv-test/
lost+found/ test1/      test2/      
[root@dg1 ~]# cat /mnt/lv-test/test2/wer.txt
asdgfhj
dgfhg
gsfdgfhg
hfgdfsdgf
hgfsds
fdgfgdfsd
fdgfd