centos 配置SAN存储--IPSAN

简单的介绍一下SAN （存储区域网络 storage area network and SAN protocols ,简称SAN），它是一种高速网络实现计算机与存储系统之间的数据传输。常见的分类是FC-SAN和IP-SAN两种。
FC-SAN通过光纤通道协议转发scsi协议；IP-SAN通过TCP协议转发scsi协议，也就是IP 地址。
存储设备是指一台或多台用以存储计算机数据的磁盘设备，通常指磁盘阵列，主要厂商EMC、日立等。

下面配置IP-SAN存储实战

服务名称	服务器地址
服务端 ：node01	192.168.137.101
客户端 ：node02	192.168.137.102
客户端 ：node03	192.168.137.103

一、服务端安装
 1.1 IPSAN 是C/S模式  服务端口3260

[root@node01 ~]# yum -y install scsi-target-utils  #yum 安装
[root@node01 ~]# ll /etc/tgt/targets.conf           #主要配置文件-rw------- 1 root root 6945 Sep  4  2013 /etc/tgt/targets.conf[root@node01 ~]# service tgtd restart            #启动服务Stopping SCSI target daemon: not running                   [FAILED]Starting SCSI target daemon:                           [  OK  ][root@node01 ~]# chkconfig tgtd on[root@node01 ~]# netstat -antup |grep 3260     #检查服务端口tcp        0      0 0.0.0.0:3260                0.0.0.0:*                   LISTEN      1125/tgtd           tcp        0      0 :::3260                     :::*                     LISTEN      1125/tgtd

1.2 新建存储分区，在这里我们通过在vmvare新增加一个块10G大小的磁盘 /dev/sdb，重启服务器

[root@node01 ~]# fdisk -l |grep "Disk"
Disk /dev/sda: 21.5 GB, 21474836480 bytes
Disk identifier: 0x0004a1ec
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
Disk identifier: 0x00000000
[root@node01 ~]#
[root@node01 ~]# fdisk  /dev/sdb         #分区 ，大小5G

1.3 共享存储分区，修改/etc/tgt/targets.conf 文件

[root@node01 ~]# vim /etc/tgt/targets.conf   # 增加以下内容，以下是iscsi的格式
<target iqn.2016-08.cn.node01.www:target4_scan>    #命名
        backing-store /dev/sdb1                    #共享的分区
        initiator-address 192.168.137.102          #允许访问的地址
        initiator-address 192.168.137.103
        vendor_id node                             #标示
        product_id target4                         #产品编号
</target>
[root@node01 ~]# systemctl restart tgtd
[root@node01 ~]# tgt-admin  -show             #查看状态Target 1: iqn.2016-08.cn.node01.www:target4_scan    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            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: 5379 MB, Block size: 512            Online: Yes            Removable media: No            Prevent removal: No            Readonly: No            Backing store type: rdwr            Backing store path: /dev/sdb1            Backing store flags:     Account information:    ACL information:        192.168.137.102        192.168.137.103[root@node01 ~]#

二、客户端配置
2.1 安装 iscsi-initiator-utils，并配置服务信息

[root@node02 ~]# yum -y install iscsi-initiator-utils
[root@node02 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.137.101    #发现target存储
Starting iscsid: [ OK ]
192.168.137.101:3260,1 iqn.2016-08.cn.node01.www:target4_scan
[root@node02 ~]#
[root@node02 ~]# /etc/init.d/iscsid status                                #查看客户端服务
iscsid (pid 1153) is running...
[root@node02 ~]#
[root@node02 ~]# tree /var/lib/iscsi/                                     #发现target服务，信息会写入/var/lib/iscsi 目录下
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│   └── iqn.2016-08.cn.node01.www:target4_scan
│   └── 192.168.137.101,3260,1
│   └── default
├── send_targets
│   └── 192.168.137.101,3260
│   ├── iqn.2016-08.cn.node01.www:target4_scan,192.168.137.101,3260,1,default -> /var/lib/iscsi/nodes/iqn.2016-08.cn.node01.www:target4_scan/192.168.137.101,3260,1
│   └── st_config
├── slp
└── static

10 directories, 2 files
[root@node02 ~]#
[root@node02 ~]# /etc/init.d/iscsid  start                   #先启动iscsid 服务[root@node02 ~]# /etc/init.d/iscsi  start                    #在启动iscsi服务 该服务是根据iscsid服务信息/var/lib/iscsi/ 来识别设备的Starting iscsi:                                            [  OK  ][root@node02 ~]#

2.2 检查是否发现磁盘， 以及卸载和登录scsi设备

点击(此处)折叠或打开

[root@node02 ~]# ll /dev/sdb
brw-rw---- 1 root disk 8, 16 Aug 12 00:48 /dev/sdb
[root@node02 ~]# lsblk                        #lsblk查看块信息的命令
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /mediasdb      8:16   0    5G  0 disk

[root@node02 ~]#
[root@node02 ~]# tree /var/lib/iscsi/
/var/lib/iscsi/├── ifaces├── isns├── nodes│   └── iqn.2016-08.cn.node01.www:target4_scan│       └── 192.168.137.101,3260,1│           └── default├── send_targets│   └── 192.168.137.101,3260│       ├── iqn.2016-08.cn.node01.www:target4_scan,192.168.137.101,3260,1,default -> /var/lib/iscsi/nodes/iqn.2016-08.cn.node01.www:target4_scan/192.168.137.101,3260,1│       └── st_config├── slp└── static10 directories, 2 files
[root@node02 ~]# iscsiadm -m node -T iqn.2016-08.cn.node01.www:target4_scan -u              #卸载scsi设备
Logging out of session [sid: 1, target: iqn.2016-08.cn.node01.www:target4_scan, portal: 192.168.137.101,3260]
Logout of [sid: 1, target: iqn.2016-08.cn.node01.www:target4_scan, portal: 192.168.137.101,3260] successful.
[root@node02 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /media
[root@node02 ~]# iscsiadm -m node -T iqn.2016-08.cn.node01.www:target4_scan -l               #登录scsi设备
Logging in to [iface: default, target: iqn.2016-08.cn.node01.www:target4_scan, portal: 192.168.137.101,3260] (multiple)
Login to [iface: default, target: iqn.2016-08.cn.node01.www:target4_scan, portal: 192.168.137.101,3260] successful.
[root@node02 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /mediasdb      8:16   0    5G  0 disk
[root@node02 ~]#

2.3 使用scsi设备，并做写入操作

[root@node02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 9.9G 869M 8.5G 10% /
tmpfs 238M 0 238M 0% /dev/shm
/dev/sda1 194M 27M 158M 15% /boot
/dev/sr0 3.6G 3.6G 0 100% /media

[root@node02 ~]#
[root@node02 ~]# fdisk /dev/sdb                 #分区

[root@node02 ~]# lsblk                          #查看分区块
NNAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /mediasdb      8:16   0    5G  0 disk └─sdb1   8:17   0    5G  0 part

[root@node02 ~]# mkfs.ext4 /dev/sdb1             #格式化分区
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
328656 inodes, 1312222 blocks
65611 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1346371584
41 block groups
32768 blocks per group, 32768 fragments per group
8016 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 21 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@node02 ~]# mkdir /scsi               #挂载分区 到新建目录/scsi
[root@node02 ~]# mount /dev/sdb1 /scsi/
[root@node02 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 9.9G 869M 8.5G 10% /
tmpfs 238M 0 238M 0% /dev/shm
/dev/sda1 194M 27M 158M 15% /boot
/dev/sr0 3.6G 3.6G 0 100% /media
/dev/sdb1 5.0G 139M 4.6G 3% /scsi
[root@node02 ~]# cp -r /root/* /scsi/    #写入验证
[root@node02 ~]# ll /scsi/
total 36
-rw------- 1 root root 980 Aug 12 00:59 anaconda-ks.cfg
-rw-r--r-- 1 root root 10197 Aug 12 00:59 install.log
-rw-r--r-- 1 root root 3161 Aug 12 00:59 install.log.syslog
drwx------ 2 root root 16384 Aug 12 00:58 lost+found
[root@node02 ~]# df -h /scsi/
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 5.0G 139M 4.6G 3% /scsi
[root@node02 ~]#

三、添加另外客户端192.168.137.103。操作同192.168.137.102基本类似，只是本次不再需要格式化分区

点击(此处)折叠或打开

[root@node03 ~]# yum -y install iscsi-initiator-utils
[root@node03 ~]#
[root@node03 ~]# iscsiadm -m discovery -t sendtargets -p 192.168.137.101
Starting iscsid: [ OK ]
192.168.137.101:3260,1 iqn.2016-08.cn.node01.www:target4_scan
[root@node03 ~]# yum -y install tree

[root@node03 ~]# tree /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│   └── iqn.2016-08.cn.node01.www:target4_scan
│   └── 192.168.137.101,3260,1
│   └── default
├── send_targets
│   └── 192.168.137.101,3260
│   ├── iqn.2016-08.cn.node01.www:target4_scan,192.168.137.101,3260,1,default -> /var/lib/iscsi/nodes/iqn.2016-08.cn.node01.www:target4_scan/192.168.137.101,3260,1
│   └── st_config
├── slp
└── static

10 directories, 2 files

[root@node03 ~]# /etc/init.d/iscsid restart
Stopping iscsid:
Starting iscsid: [ OK ]
[root@node03 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /media

[root@node03 ~]# /etc/init.d/iscsi restart
Stopping iscsi: [ OK ]
Starting iscsi: [ OK ]
[root@node03 ~]# lsblk                      #可以看到设备sdb1 了
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0   20G  0 disk ├─sda1   8:1    0  200M  0 part /boot├─sda2   8:2    0   10G  0 part /└─sda3   8:3    0    1G  0 part [SWAP]sr0     11:0    1  3.6G  0 rom  /mediasdb      8:16   0    5G  0 disk └─sdb1   8:17   0    5G  0 part

[root@node03 ~]#
[root@node03 ~]#
[root@node03 ~]# mkdir /scsi
[root@node03 ~]# mount /dev/sdb1 /scsi/              #挂载
[root@node03 ~]# cd !$
cd /scsi/
[root@node03 scsi]# ll                               #可以可看到在node02中写入的内容
total 36
-rw------- 1 root root 980 Aug 12 00:59 anaconda-ks.cfg
-rw-r--r-- 1 root root 10197 Aug 12 00:59 install.log
-rw-r--r-- 1 root root 3161 Aug 12 00:59 install.log.syslog
drwx------ 2 root root 16384 Aug 12 00:58 lost+found
[root@node03 scsi]# cp /etc/passwd /scsi/            #在node03上写入新文件passwd，在node02验证
[root@node03 scsi]# ll
total 40
-rw------- 1 root root 980 Aug 12 00:59 anaconda-ks.cfg
-rw-r--r-- 1 root root 10197 Aug 12 00:59 install.log
-rw-r--r-- 1 root root 3161 Aug 12 00:59 install.log.syslog
drwx------ 2 root root 16384 Aug 12 00:58 lost+found
-rw-r--r-- 1 root root 901 Aug 12 01:11 passwd
[root@node03 scsi]#
#在node02 未能识别node03写入的passwd文件， 没有同步，是因为我们使用ext4文件系统 不支持，使用GFS可以保持同步
[root@node02 scsi]# lltotal 36-rw------- 1 root root   980 Aug 12 00:59 anaconda-ks.cfg-rw-r--r-- 1 root root 10197 Aug 12 00:59 install.log-rw-r--r-- 1 root root  3161 Aug 12 00:59 install.log.syslogdrwx------ 2 root root 16384 Aug 12 00:58 lost+found[root@node02 scsi]#

四、思考
    4.1 验证GFS文件系统 ，支持多节点同时写入。
    4.2 ISCSI在多路径方面的应用。
    4.3 需要优化的参数都有哪些

转载
http://blog.itpub.net/27039319/viewspace-2123341/

tgtadm和iscsiadm命令的用法