iSCSI存储服务配置实现过程

iSCSI存储服务配置实现过程：

拓扑图：

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服务器端配置

1)准备要共享的设备,这里使用本地磁盘上的新分区/dev/sda5
# fdisk /dev/sda
# partprobe /dev/sda
注意这里不要对新建分区进行格式化操作
2)安装iscsi服务端
用到的安装包有
openib-1.4.1-6.el5.noarch.rpm                                               scsi-target-utils-1.0.14-2.el5.i386.rpm                                       libibverbs-1.1.3-2.el5.i386.rpm                                               librdmacm-1.0.10-1.el5.i386.rpm                                        libnes-0.9.0-2.el5.i386.rpm                                                  perl-Config-General-2.40-1.el5.noarch.rpm
配置好yum源然后安装scsi-target-utils
# yum -y install scsi-target-utils
启动tgtd服务
# service tgtd start
# netstat –tnlp //确保3260端口已经打开//
# chkconfig tgtd on //开机自动启动//
添加target
# tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2012-08.com.wjw.target:dis1
查看创建的target
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2012-08.com.wjw.target:dis1
    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:
    Account information:
ACL information:
target添加成功
添加LUN
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sda5
查看一下
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2012-08.com.wjw.target:dis1
    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: 419 MB, Block size: 512
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/sda5
            Backing store flags:
    Account information:
ACL information:
LUN添加成功
添加访问控制列表，开放给172.16.0.0/16网络中的主机访问
# tgtadm --lld iscsi --op bind --mode target --tid 1 -I 172.16.0.0/16
查看一下
# tgtadm --lld iscsi --op show --mode target
Target 1: iqn.2012-08.com.wjw.target:dis1
    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: 419 MB, Block size: 512
            Online: Yes
            Removable media: No
            Readonly: No
            Backing store type: rdwr
            Backing store path: /dev/sda5
            Backing store flags:
    Account information:
    ACL information:
        172.16.0.0/16 //访问控制列表已经添加成功//

客户端1和客户端2配置

客户端已经默认安装过iscsi-initiator-utils
启动iscsi服务并使其开机自动启动
# service iscsi start
# chkconfig iscsi on
为了方便演示，这里为客户端1和客户端2的initiatorname添加别名；
# vim /etc/iscsi/initiatorname.iscsi
客户端1添加如下行
InitiatorAlias=initiator1
客户端2添加如下行
InitiatorAlias=initiator1
配置客户端发现服务端共享target然后连接到本地上来
# iscsiadm -m discovery -t sendtargets -p 172.16.11.12
172.16.11.12:3260,1 iqn.2012-08.com.wjw.target:dis1
查看/var/lib/iscsi/send_targets/172.16.11.12,3260/目录下信息
# ls /var/lib/iscsi/send_targets/172.16.11.12,3260/
iqn.2012-08.com.wjw.target:dis1,172.16.11.12,3260,1,default  st_config //表明客户端已经成功发现服务端共享target并连接到本地上来了；
登录到服务端的target上
# iscsiadm -m node -T iqn.2012-08.com.wjw.target:dis1 -p 172.16.11.12:3260 -l
Logging in to [iface: default, target: iqn.2012-08.com.wjw.target:dis1, portal: 172.16.11.12,3260] (multiple)
Login to [iface: default, target: iqn.2012-08.com.wjw.target:dis1, portal: 172.16.11.12,3260] successful. //登录成功//
查看磁盘设备
# fdisk -l

Disk /dev/sda: 343.5 GB, 343597383680 bytes
255 heads, 63 sectors/track, 41773 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start End Blocks   Id  System
/dev/sda1 * 1          13      104391   83  Linux
/dev/sda2              14        5235    41945715   8e  Linux LVM
/dev/sda3            5236        5366     1052257+ 82  Linux swap / Solaris

Disk /dev/sdb: 419 MB, 419457024 bytes
13 heads, 62 sectors/track, 1016 cylinders
Units = cylinders of 806 * 512 = 412672 bytes

Disk /dev/sdb doesn't contain a valid partition table //此时服务端的/dev/sda5分区已被客户端识别为了一块磁盘，可以对该磁盘进行分区格式化了；
在客户端1上对磁盘分区并格式化，创建一个/dev/sdb1分区
# fdisk /dev/sdb
# partprobe /dev/sdb
# mke2fs -j /dev/sdb1
挂载/dev/sdb1至本地/mnt目录下
# mount /dev/sdb1 /mnt
# ls /mnt/
lost+found //挂载成功//
复制/etc/fstab文件至/mnt目录下
# cp /etc/fstab /mnt/
# ls /mnt/
fstab  lost+found
通过客户端2来访问一下/dev/sdb1中的数据
挂载磁盘分区/dev/sdb1至本地/mnt目录
# mount /dev/sdb1 /mnt
# ls /mnt/
lost+found //挂载成功//
# ls /mnt/
fstab  lost+found
由此可见客户端1和2能同时共用服务端的iSCSI存储设备了；

      以上就是iSCSI存储服务配置实现过程，后续更多内容将会持续添加，有好知识希望与大家共同分享。