使用iSCSI搭建IP SAN存储网络
准备工作：
| 主机 | 系统 | 地址 | 软件 |
| target主机 | CentOS 6.4 i386 | 192.168.0.22 | iscsi-target-utils |
| initiator主机 | CentOS 6.4 i386 | 192.168.0.23 | iscsi-initiator-utils |
| initiator主机 | CentOS 6.4 i386 | 192.168.0.24 | iscsi-initiator-utils |
一. 配置target主机
在target主机有两块硬盘，/dev/sda和/dev/sdb，其中sdb作为iSCSI的共享磁盘
1. 安装iSCSI的服务端
[root@target ~]# yum install scsi-target-utils
2. 将tgtd服务设置为开机启动，并将它启动
[root@target ~]# chkconfig tgtd on [root@target ~]# service tgtd start Starting SCSI target daemon: [ OK ]
3. 关于tgtadm命令的简单介绍
[root@target ~]# tgtadm -h
Usage: tgtadm [OPTION]
Linux SCSI Target Framework Administration Utility, version 1.0.24
--lld <driver> --mode target --op new --tid <id> --targetname <name>
add a new target with <id> and <name>. <id> must not be zero.
--lld <driver> --mode target --op delete [--force] --tid <id>
delete the specific target with <id>.
With force option, the specific target is deleted
even if there is an activity.
--lld <driver> --mode target --op show
show all the targets.
--lld <driver> --mode target --op show --tid <id>
show the specific target's parameters.
--lld <driver> --mode target --op update --tid <id> --name <param> --value <value>
change the target parameters of the specific
target with <id>.
--lld <driver> --mode target --op bind --tid <id> --initiator-address <address>
--lld <driver> --mode target --op bind --tid <id> --initiator-name <name>
enable the target to accept the specific initiators.
--lld <driver> --mode target --op unbind --tid <id> --initiator-address <address>
--lld <driver> --mode target --op unbind --tid <id> --initiator-name <name>
disable the specific permitted initiators.
--lld <driver> --mode logicalunit --op new --tid <id> --lun <lun> \
--backing-store <path> --bstype <type> --bsoflags <options>
add a new logical unit with <lun> to the specific
target with <id>. The logical unit is offered
to the initiators. <path> must be block device files
(including LVM and RAID devices) or regular files.
bstype option is optional.
bsoflags supported options are sync and direct
(sync:direct for both).
--lld <driver> --mode logicalunit --op delete --tid <id> --lun <lun>
delete the specific logical unit with <lun> that
the target with <id> has.
--lld <driver> --mode account --op new --user <name> --password <pass>
add a new account with <name> and <pass>.
--lld <driver> --mode account --op delete --user <name>
delete the specific account having <name>.
--lld <driver> --mode account --op bind --tid <id> --user <name> [--outgoing]
add the specific account having <name> to
the specific target with <id>.
<user> could be <IncomingUser> or <OutgoingUser>.
If you use --outgoing option, the account will
be added as an outgoing account.
--lld <driver> --mode account --op unbind --tid <id> --user <name>
delete the specific account having <name> from specific
target.
--control-port <port> use control port <port>
--help display this help and exit
Report bugs to <[email protected]>.
首先，创建一个target
[root@target ~]# tgtadm -L iscsi -m target -o new -t 1 -T iqn.2014-03.com.flyence:target1
查看该target的相关情况
[root@target ~]# tgtadm -L iscsi -m target -o show
创建一个LU，并将/dev/sdb作为共享磁盘
[root@target ~]# tgtadm -L iscsi -m logicalunit -o new -t 1 -l 1 -b /dev/sdb
允许192.168.0.0/16网段的主机访问
[root@target ~]# tgtadm -L iscsi -m target -o bind -t 1 -I 192.168.0.0/24
创建认证账号，并绑定到target上
[root@target ~]# tgtadm -L iscsi -m account -o new --user flyence --password flyence [root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user flyence
该账号作为客户机访问服务端的认证账号
创建认证账号，并以outgoing的形式绑定到target上
[root@target ~]# tgtadm -L iscsi -m account -o new --user evan --password evan [root@target ~]# tgtadm -L iscsi -m account -o bind -t 1 --user evan --outgoing
当客户机向服务端写入前，客户机会用此账号验证服务器的身份。
二. 配置客户端
1. 安装iscsi-initiator-utils
[root@initiator ~]# yum install iscsi-initiator-utils
2. 设置initiator的名字
[root@initiator iscsi]# echo "InitiatorName=`iscsi-iname -p iqn.2014-03.com.flyence`" > /etc/iscsi/initiatorname.iscsi [root@initiator iscsi]# cat initiatorname.iscsi InitiatorName=iqn.2014-03.com.flyence:9e9d0941d1f
3. 在/etc/iscsi/iscsi.conf中配置验证账号信息，启用以下5行，并修改
node.session.auth.authmethod = CHAP
node.session.auth.username = flyence
node.session.auth.password = flyence
node.session.auth.username_in = evan
node.session.auth.password_in = evan
4. 发现服务器的target
[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260 Starting iscsid: [ OK ] 192.168.0.22:3260,1 iqn.2014-03.com.flyence:target1
5. 登录上述被发现的target
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -l Logging in to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] (multiple) Login to [iface: default, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.
6. 查看当前的磁盘情况
[root@initiator iscsi]# fdisk -l /dev/sd[a-z] Disk /dev/sda: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000925b4 Device Boot Start End Blocks Id System /dev/sda1 * 1 26 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 26 7675 61440000 8e Linux LVM /dev/sda3 7675 14049 51200000 8e Linux LVM /dev/sda4 14049 15666 12983296 5 Extended /dev/sda5 14049 15666 12982272 8e Linux LVM Disk /dev/sdb: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
多出一块硬盘/dev/sdb，并且sdb还没分区，
7. 将sdb分两个区，并将sdb1格式化为ext4
[root@initiator iscsi]# fdisk /dev/sdb .... [root@initiator iscsi]# fdisk -l /dev/sdb Disk /dev/sdb: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc9458e42 Device Boot Start End Blocks Id System /dev/sdb1 1 1306 10490413+ 83 Linux /dev/sdb2 1307 2612 10490445 83 Linux [root@initiator iscsi]# mkfs.ext4 /dev/sdb1
8. 此时，查看target主机的sdb硬盘情况
[root@target ~]# fdisk -l /dev/sdb Disk /dev/sdb: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc9458e42 Device Boot Start End Blocks Id System /dev/sdb1 1 1306 10490413+ 83 Linux /dev/sdb2 1307 2612 10490445 83 Linux
已被分好区
当要开机启动服务时
[root@initiator iscsi]# chkconfig iscsid on
三. 服务端target配置文件的设定
在服务端如果只是在命令行中定义target和LU，在重启时会消失，要使其永久有效，就得写入配置文件/etc/tgt/targets.conf
<target iqn.2014-03.com.flyence:target2>
backing-store /dev/sdb
initiator-address 192.168.0.0/16
incominguser flyence flyence
outgoinguser evan evan
</target>
重启服务器主机，再看看target的配置
[root@target ~]# tgtadm -L iscsi -m target -o show
Target 1: iqn.2014-03.com.flyence:target2
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.2014-03.com.flyence:9e9d0941d1f
Connection: 0
IP Address: 192.168.0.23
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: 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: 128849 MB, Block size: 512
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/sdb
Backing store flags:
Account information:
flyence
evan (outgoing)
ACL information:
192.168.0.0/16
此时，由于已修改了target的名字，则客户机无法直接登录，只能删除原有信息，重新发现和登录
在客户机上，先登出原有的target
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -u Logging out of session [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] Logout of [sid: 1, target: iqn.2014-03.com.flyence:target1, portal: 192.168.0.22,3260] successful.
删除该target及相关文件
[root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target1 -p 192.168.0.22:3260 -o delete [root@initiator iscsi]# rm -rf /var/lib/iscsi/send_targets/192.168.0.22,3260/
重启服务
[root@initiator iscsi]# service iscsid restart Stopping iscsid: Starting iscsid: [ OK ]
重新发现和登录
[root@initiator iscsi]# iscsiadm -m discovery -t st -p 192.168.0.22:3260 192.168.0.22:3260,1 iqn.2014-03.com.flyence:target2 [root@initiator iscsi]# iscsiadm -m node -T iqn.2014-03.com.flyence:target2 -p 192.168.0.22:3260 -l Logging in to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] (multiple) Login to [iface: default, target: iqn.2014-03.com.flyence:target2, portal: 192.168.0.22,3260] successful.
查看磁盘
[root@initiator iscsi]# fdisk -l /dev/sdb Disk /dev/sdb: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc9458e42 Device Boot Start End Blocks Id System /dev/sdb1 1 1306 10490413+ 83 Linux /dev/sdb2 1307 2612 10490445 83 Linux