iscsi

#################iscsi################

#####################################

iSCSI(Internet SCSI)支持從客戶端(發起端)經過IP向遠程服務器上的

SCSI存儲設備(目標)發送SCSI命令。iSCSI限定名稱用於肯定發起端和目

標,並採用iqn.yyyy-mm.{reverse domain}:label的格式。默認狀況下,網絡

通訊是至iSCSI目標上的端口3260/tcp的明文。

l iSCSI發起端:須要訪問原始SAN存儲的客戶端。

l iSCSI目標:從iSCSI服務器提供的遠程硬盤磁盤,或「目標門戶」

l iSCSI目標門戶:經過網絡向發起端提供目標的服務器。

l

IQN:「iSCSI限定名稱」。每一個發起端和目標須要惟一名稱進行標識,

最好的作法是使用一個在Internet上可能獨一無二的名稱。

1.在server端

 

先對vdb進行分區

 

[root@server ~]# pvcreate /dev/vdb1

  Physical volume "/dev/vdb1" successfully created

[root@server ~]# vgcreate vg0 /dev/vdb1

  Volume group "vg0" successfully created

[root@server ~]# lvcreate -l 249 -n iscsi_storage vg0

  Logical volume "iscsi_storage" created

[root@server ~]# lvs   ##查看lvm設備

  LV            VG   Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert

  iscsi_storage vg0  -wi-a----- 996.00m

 

安裝iscsi目標軟件包

yum install -y targetcli

systemctl enable target

systemctl start target

systemctl stop firewalld

 

進入iscsi目標交互式配置模式

[root@server ~]# targetcli

Warning: Could not load preferences file /root/.targetcli/prefs.bin.

targetcli shell version 2.1.fb34

Copyright 2011-2013 by Datera, Inc and others.

For help on commands, type 'help'.

 

/> ls

o- / ..................................................................... [...]

  o- backstores .......................................................... [...]

  | o- block .............................................. [Storage Objects: 0]

  | o- fileio ............................................. [Storage Objects: 0]

  | o- pscsi .............................................. [Storage Objects: 0]

  | o- ramdisk ............................................ [Storage Objects: 0]

  o- iscsi ........................................................ [Targets: 0]

  o- loopback .........................................

/> /backstores/block create server1storage /dev/vg0/iscsi_storage

Created block storage object server1storage using /dev/vg0/iscsi_storage.

/> /iscsi create iqn.2017-06.com.example:stragel

Created target iqn.2017-06.com.example:stragel.

Created TPG 1.

/> clearconfig confirm=True

All configuration cleared

/> ls

o- / ..................................................................... [...]

  o- backstores .......................................................... [...]

  | o- block .............................................. [Storage Objects: 0]

  | o- fileio ............................................. [Storage Objects: 0]

  | o- pscsi .............................................. [Storage Objects: 0]

  | o- ramdisk ............................................ [Storage Objects: 0]

  o- iscsi ........................................................ [Targets: 0]

  o- loopback ..................................................... [Targets: 0]

/> /backstores/block create server1storage /dev/vg0/iscsi_storage

Created block storage object server1storage using /dev/vg0/iscsi_storage.

/> /iscsi create iqn.2017-06.com.example:strage1

Created target iqn.2017-06.com.example:strage1.

Created TPG 1.

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/luns create /backstores/block/server1storage

Created LUN 0.

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/acls create iqn.017-06.com.example:server1storagekey

WWN not valid as: iqn, naa, eui

/> /iscsi/iqn.2017-06.com.example:strage1/tpg1/acls create iqn.2017-06.com.example:server1storagekey

Created Node ACL for iqn.2017-06.com.example:server1storagekey

Created mapped LUN 0.

/> /iscsi

/iscsi> exit

Global pref auto_save_on_exit=true

Last 10 configs saved in /etc/target/backup.

Configuration saved to /etc/target/saveconfig.json

 

 

 

systemctl restart iscsi

 

 

 

2.在desktop端

systemctl stop firewalld

systemctl disable firewalld

 

[root@desktop ~]# vim /etc/iscsi/initiatorname.iscsi    ###在/etc/iscsi/initiatorname.iscsi中設置發起端的IQN

[root@desktop ~]# iscsiadm -m discovery -t st -p 172.25.254.102   ###查找iscai服務器所提供的iscsi目標

172.25.254.102:3260,1 iqn.2017-06.com.example:strage1

 

[root@desktop ~]# iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.254.102 -l   登錄服務器上的一個或多個iscsi目標

Logging in to [iface: default, target: iqn.2017-06.com.example:strage1, portal: 172.25.254.102,3260] (multiple)

Login to [iface: default, target: iqn.2017-06.com.example:strage1, portal: 172.25.254.102,3260] successful.

 

[root@desktop ~]# fdisk -l

 

Disk /dev/sda: 1044 MB, 1044381696 bytes, 2039808 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 4194304 bytes

 

對sda進行分區

 

[root@desktop ~]# partprobe    ###同步分區表

[root@desktop ~]# mkfs.xfs /dev/sda

mkfs.xfs: /dev/sda appears to contain a partition table (dos).

mkfs.xfs: Use the -f option to force overwrite.

[root@desktop ~]# mkfs.xfs /dev/sda1 -f

meta-data=/dev/sda1              isize=256    agcount=8, agsize=31744 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=0

data     =                       bsize=4096   blocks=253952, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

log      =internal log           bsize=4096   blocks=853, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

[root@desktop ~]# mount /dev/sda1 /mnt

 

 

 

[root@desktop ~]# yum install -y tree

 

[root@desktop ~]# tree -C /var/lib/iscsi/

/var/lib/iscsi/

├── ifaces

├── isns

├── nodes

│   └── iqn.2017-06.com.example:strage1

│       └── 172.25.254.102,3260,1

│           └── default

├── send_targets

│   └── 172.25.254.102,3260

│       ├── iqn.2017-06.com.example:strage1,172.25.254.102,3260,1,default -> /var/lib/iscsi/nodes/iqn.2017-06.com.example:strage1/172.25.254.102,3260,1

│       └── st_config

├── slp

└── static

 

 

[root@desktop ~]# blkid    ###查看分區的UUID

/dev/vda1: UUID="9bf6b9f7-92ad-441b-848e-0257cbb883d1" TYPE="xfs"

/dev/sda1: UUID="4fc4230e-3b7d-42fc-a11a-1d1d07968289" TYPE="xfs"

 

 

寫自動掛載

vim /etc/fstab

              

 

3.刪除客戶端的數據

iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.254.102 -u

##確保iscsi服務在引導時啓動。

##確保沒有使用目標所提供的任何設備。

##確保從/etc/fstab等位置中刪除使用目標的全部永久掛載

##登出iSCSI目標,以暫時斷開鏈接。

 

iscsiadm -m node -T iqn.2017-06.com.example:strage1 -p 172.25.254.102 -o delete

   ###刪除iSCSI目標的本地記錄,以永久斷開鏈接。

 

4.刪除服務端的數據

clearconfig confirm=Ture    ##清除iscsi的全部信息