RH436攻略之iscsi

创建iscsi target

1、准备存储(实验用的是lvm)

[root@node4 ~]# lvcreate -n storage -L 4G vgsrv
  Logical volume "storage" created
[root@node4 ~]# lvs
  LV      VG    Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  home    vgsrv -wi-ao 256.00m                                     
  root    vgsrv -wi-ao   3.31g                                     
  storage vgsrv -wi-a-   4.00g     #确认lvm创建成功                       
  swap    vgsrv -wi-ao 544.00m


2、安装 scsi-target-utils 包

[root@node4 ~]# yum install -y scsi-target-utils
...
...
Installed:
  scsi-target-utils.x86_64 0:1.0.14-4.el6                                      
Dependency Installed:
  libibverbs.x86_64 0:1.1.5-3.el6           librdmacm.x86_64 0:1.0.14.1-3.el6 
  perl-Config-General.noarch 0:2.44-1.el6 
Complete!


3、编辑tgt配置文件

[root@node4 ~]# vim /etc/tgt/targets.conf
[root@node4 ~]# grep -Ev '\ *#|^$' /etc/tgt/targets.conf
default-driver iscsi
<target iqn.2012-04.com.example.cluster3:storage>
    <backing-store /dev/vgsrv/storage> #因为是物理设备,所以是backing-store
    vendor_id rhtraining         #指定vendor_id
    scsi_sn  rh436               #指定易于辨识的scsi_sn
    </backing-store>
    initiator-address 172.18.3.1  #指定initiator的有效IP(ACL)
    initiator-address 172.18.3.2
    initiator-address 172.18.3.3
</target>

4、测试tgtd守护进程启动

[root@node4 ~]# service tgtd start
Starting SCSI target daemon:                               [  OK  ]


5、检查target输出

[root@node4 ~]# tgt-admin -s
Target 1: iqn.2012-04.com.example.cluster3:storage #iqn输出正确
    System information:
        Driver: iscsi
        State: ready  #状态正常
    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: rh436        #sn输出正确
            Size: 4295 MB, Block size: 512
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/vgsrv/storage #存储源
            Backing store flags:
    Account information:
    ACL information:
        172.18.3.1    #ACL正确
        172.18.3.2
        172.18.3.3


6、配置tgtd开机自启动

[root@node4 ~]# chkconfig tgtd on


配置initiator端

1、配置Initiator Name

[root@node1 ~]# vim /etc/iscsi/initiatorname.iscsi
[root@node1 ~]# cat /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2012-04.com.example.cluster3:node1


2、重启iscsid服务,使Initiator Name生效

[root@node1 ~]# service iscsid restart
Stopping iscsid:
Starting iscsid:                                           [  OK  ]


3、探测iscsi并登录

[root@node1 ~]# iscsiadm -m discovery -t st -p 172.18.3.4
172.18.3.4:3260,1 iqn.2012-04.com.example.cluster3:storage
[root@node1 ~]# iscsiadm -m node -T iqn.2012-04.com.example.cluster3:storage -l
Logging in to [iface: default, target: iqn.2012-04.com.example.cluster3:storage, portal: 172.18.3.4,3260] (multiple)
Login to [iface: default, target: iqn.2012-04.com.example.cluster3:storage, portal: 172.18.3.4,3260] successful.


4、确认iscsi状态

[root@node1 ~]# iscsiadm -m session -P1  #-P后面0-3显示详细程度不同
Target: iqn.2012-04.com.example.cluster3:storage
        Current Portal: 172.18.3.4:3260,1
        Persistent Portal: 172.18.3.4:3260,1
                **********
                Interface:
                **********
                Iface Name: default
                Iface Transport: tcp
                Iface Initiatorname: iqn.2012-04.com.example.cluster3:node1  #配置initiator生效
                Iface IPaddress: 172.18.3.1
                Iface HWaddress: <empty>
                Iface Netdev: <empty>
                SID: 9
                iSCSI Connection State: LOGGED IN
                iSCSI Session State: LOGGED_IN
                Internal iscsid Session State: NO CHANGE


5、可以看到iscsi磁盘了

[root@node1 ~]# iscsiadm -m session -P3
iSCSI Transport Class version 2.0-870
version 2.0-872.33.el6
Target: iqn.2012-04.com.example.cluster3:storage
        Current Portal: 172.18.3.4:3260,1
        Persistent Portal: 172.18.3.4:3260,1
                **********
                Interface:
                **********
                Iface Name: default
                Iface Transport: tcp
                Iface Initiatorname: iqn.2012-04.com.example.cluster3:node1
                Iface IPaddress: 172.18.3.1
                Iface HWaddress: <empty>
                Iface Netdev: <empty>
                SID: 11
                iSCSI Connection State: LOGGED IN
                iSCSI Session State: LOGGED_IN
                Internal iscsid Session State: NO CHANGE
                *********
                Timeouts:
                *********
                Recovery Timeout: 120
                Target Reset Timeout: 30
                LUN Reset Timeout: 30
                Abort Timeout: 15
                *****
                CHAP:
                *****
                username: <empty>
                password: ********
                username_in: <empty>
                password_in: ********
                ************************
                Negotiated iSCSI params:
                ************************
                HeaderDigest: None
                DataDigest: None
                MaxRecvDataSegmentLength: 262144
                MaxXmitDataSegmentLength: 8192
                FirstBurstLength: 65536
                MaxBurstLength: 262144
                ImmediateData: Yes
                InitialR2T: Yes
                MaxOutstandingR2T: 1
                ************************
                Attached SCSI devices:
                ************************
                Host Number: 12 State: running
                scsi12 Channel 00 Id 0 Lun: 0
                scsi12 Channel 00 Id 0 Lun: 1
                        Attached scsi disk sda          State: running
                #需要用-P3才能看到iscsi对应的磁盘名称
[root@node1 ~]# ll /dev/sd*
brw-rw----. 1 root disk 8, 0 Apr  1 23:33 /dev/sda



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