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