ISCSI 术语
IQN： ISCSI合格名称,格式：iqn.YYYY-MM.com.clovem.www:stro_name ==>主机名倒着写
Target：ISCSI存储服务器
Initiator：使用Target的节点，前端节点
Node：ISCSI存储服务器或者前端节点
Portal：ISCSI的访问入口，ISCSI存储的端口
ISCSI Target： node4
1.安装scsi-target-utils //服务端程序
[root@node4 ~]# yum install scsi-target-utils -y [root@node4 ~]# vgs VG #PV #LV #SN Attr VSize VFree vgsrv 1 3 0 wz--n- 8.78g 4.69g [root@node4 ~]# lvcreate -L 1GB -n lv0 vgsrv Logical volume "lv0" created [root@node4 ~]# lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert home vgsrv -wi-ao 256.00m lv0 vgsrv -wi-a- 1.00g root vgsrv -wi-ao 3.31g swap vgsrv -wi-ao 544.00m [root@node4 ~]# ls /dev/vgsrv/lv0 /dev/vgsrv/lv0
2.编辑 /etc/tgt/targets.conf,复制38-40行，粘贴如下
[root@node4 ~]# vi /etc/tgt/targets.conf
backing-store /dev/vgsrv/lv0
3. 启动tgtd服务，查看设备是否被导出
[root@node4 ~]# service tgtd start
Starting SCSI target daemon: [ OK ]
[root@node4 ~]# tgt-admin --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
ALL
4.查看Target1后面的LUN:1是我们导出的设备：/dev/vgsrv/lv0
ISCSI Initiator:desktop26
[root@desktop26 ~]# rpm -q iscsi-initiator-utils iscsi-initiator-utils-6.2.0.872-34.el6.x86_64 [root@desktop26 ~]# which iscsiadm /sbin/iscsiadm
1.启用发现并登录
[root@desktop26 ~]# ls /dev/sd* /dev/sda /dev/sda1 /dev/sda2 /dev/sda3 [root@desktop26 ~]# iscsiadm -m discovery -t sendtargets -p 172.18.26.4:3260 172.18.26.4:3260,1 iqn.2013-05.com.clovem:target1 [root@desktop26 ~]# iscsiadm -m node -T iqn.2013-05.com.clovem:target1 -l Logging in to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] (multiple) Login to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful. [root@desktop26 ~]# ls /dev/sd* /dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sdb [root@desktop26 ~]# ls /dev/disk/by-path/ ip-172.18.26.4:3260-iscsi-iqn.2013-05.com.clovem:target1-lun-1 pci-0000:00:07.1-scsi-1:0:1:0-part1 pci-0000:00:07.1-scsi-1:0:0:0 pci-0000:00:07.1-scsi-1:0:1:0-part2 pci-0000:00:07.1-scsi-1:0:1:0 pci-0000:00:07.1-scsi-1:0:1:0-part3
2. 通过iscsiadm命令查看是否导入成功
[root@desktop26 ~]# iscsiadm -m session -P1
Target: iqn.2013-05.com.clovem:target1
Current Portal: 172.18.26.4:3260,1
Persistent Portal: 172.18.26.4:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:59585542a2c
Iface IPaddress: 172.18.26.254
Iface HWaddress:
Iface Netdev:
SID: 2
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
3.修改Initiator端名，尽量做在发现跟登入前
[root@desktop26 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2013-05.com.clovem:node1
[root@desktop26 ~]# iscsiadm -m node -T iqn.2013-05.com.clovem:target1 -u
Logging out of session [sid: 10, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260]
Logout of [sid: 10, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful.
[root@desktop26 ~]# service iscsid stop
Stopping iscsid:
[root@desktop26 ~]# iscsiadm -m discovery -t sendtargets -p 172.18.26.4:3260
Starting iscsid: [ OK ]
172.18.26.4:3260,1 iqn.2013-05.com.clovem:target1
[root@desktop26 ~]# iscsiadm -m node -T iqn.2013-05.com.clovem:target1 -l
Logging in to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] (multiple)
Login to [iface: default, target: iqn.2013-05.com.clovem:target1, portal: 172.18.26.4,3260] successful.
[root@desktop26 ~]# iscsiadm -m session -P1
Target: iqn.2013-05.com.clovem:target1
Current Portal: 172.18.26.4:3260,1
Persistent Portal: 172.18.26.4:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.2013-05.com.clovem:node1
Iface IPaddress: 172.18.26.254
Iface HWaddress:
Iface Netdev:
SID: 11
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
现在可以看到Iface Initiatorname: iqn.2013-05.com.clovem:node1 ，修改成功，一般情况下面在导入设备之前就修改客户端设备名。
回到node4中查看状态，可以看到客户端设备名了
[root@node4 ~]# tgt-admin --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 11
Initiator: iqn.2013-05.com.clovem:node1
Connection: 0
IP Address: 172.18.26.254
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
ALL
定义服务端导出设备属性以及访问控制，修改/etc/tgt/target.conf
< backing-store /dev/vgsrv/lv0> vendor-id clovemfong, Inc. scsi_id target1 scsi_sn s01 initiator-address 172.18.26.254
重新加载配置文件：service tgtd force-reload //由于当前有客户端登入，需要强制重载配置文
[root@node4 ~]# tgt-admin --show
Target 1: iqn.2013-05.com.clovem:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.2013-05.com.clovem:node1
Connection: 0
IP Address: 172.18.26.254
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: target1
SCSI SN: s01
Size: 1074 MB, Block size: 512
Online: Yes
Removable media: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/vgsrv/lv0
Backing store flags:
Account information:
ACL information:
172.18.26.254
如果ISCSI存储设备容量>=2TB,就不能够使用常规的fdisk 命令进行磁盘的分区了(其分区表格式为msdos)，需要使用parted，其分区表格式为GPT
命令：
parted /dev/sdb print //查看分区
parted /dev/sdb mklabel gpt //转换格式(msdos gpt)
parted /dev/sdb mkpart primary 1m 100m //创建起始大小为1M，结束为100M的名为primary的分区
分区改名：
parted /dev/sdb name 2 ' "Linux FileSystem" ' //对2号分区改名
parted -s /dev/sdb mkfs 1 ext4 //将1号分区格式化为ext4文件系统,测试发现不支持ext4如此格式化，仅仅默认支持ext2,所以通过mkfs.ext4命令进行格式化即可。
[root@desktop26 ~]# parted /dev/sdb mklabel gpt Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue? Yes/No? Yes Information: You may need to update /etc/fstab. [root@desktop26 ~]# parted /dev/sdb mkpart rh436 200m 300m Information: You may need to update /etc/fstab. [root@desktop26 ~]# parted /dev/sdb print Model: IET VIRTUAL-DISK (scsi) Disk /dev/sdb: 1074MB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 200MB 300MB 99.6MB rh436 [root@desktop26 ~]# mkfs.ext4 /dev/sdb1 > /dev/null 2>&1 [root@desktop26 ~]# parted /dev/sdb print Model: IET VIRTUAL-DISK (scsi) Disk /dev/sdb: 1074MB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 200MB 300MB 99.6MB ext4 rh436 [root@desktop26 ~]# mkdir /rh436 ; mount /dev/sdb1 /rh436 ; df -H |grep rh436 /dev/sdb1 97M 5.8M 86M 7% /rh436