RHEL 6.5----iscsi多路径存储
| 主机名 | IP |
| master |
eth0: 192.168.30.130(NAT) eth1: 192.168.17.130(VMNet4) |
| node-1 |
eth0: 192.168.30.131(NAT) eth1: 192.168.17.131(VMNet4) |
安装过程省略
master上的配置
[root@master ~]# vim /etc/tgt/targets.conf
<target iqn.-.cn.sishen.www:target_san1>
backing-store /dev/sdb1
initiator-address 192.168.30.131
initiator-address 192.168.17.131
vendor_id sishen
product_id target-
</target>
[root@master ~]# /etc/init.d/tgtd restart
Stopping SCSI target daemon: initiators still connected [FAILED]
Starting SCSI target daemon: [ OK ]
[root@master ~]# tgt
tgtadm tgt-admin tgtd tgtimg tgt-setup-lun
[root@master ~]# tgt-admin --show
Target : iqn.-.cn.sishen.www:target_san1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN:
Type: controller
SCSI ID: IET
SCSI SN: beaf10
Size: MB, Block size:
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
Account information:
ACL information:
192.168.30.131
192.168.17.131
在客户端测试通讯
[root@node- ~]# ping -c 192.168.30.130
PING 192.168.30.130 (192.168.30.130) () bytes of data.
bytes from 192.168.30.130: icmp_seq= ttl= time=0.183 ms
bytes from 192.168.30.130: icmp_seq= ttl= time=0.267 ms --- 192.168.30.130 ping statistics ---
packets transmitted, received, % packet loss, time 1000ms
rtt min/avg/max/mdev = 0.183/0.225/0.267/0.042 ms
[root@node- ~]# ping -c 192.168.17.130
PING 192.168.17.130 (192.168.17.130) () bytes of data.
bytes from 192.168.17.130: icmp_seq= ttl= time=0.350 ms
bytes from 192.168.17.130: icmp_seq= ttl= time=0.154 ms --- 192.168.17.130 ping statistics ---
packets transmitted, received, % packet loss, time 1000ms
rtt min/avg/max/mdev = 0.154/0.252/0.350/0.098 ms
配置线路1
[root@node- ~]# iscsiadm -m discovery -t sendtargets -p 192.168.30.130:
Starting iscsid: [ OK ]
192.168.30.130:, iqn.-.cn.sishen.www:target_san1
[root@node- ~]# /etc/init.d/iscsi restart
Stopping iscsi: [ OK ]
Starting iscsi: [ OK ]
[root@node- ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 : .6G rom /media/cdrom
sda : 20G disk
├─sda1 : 200M part /boot
├─sda2 : 2G part [SWAP]
└─sda3 : .8G part
└─vg_master-LogVol00 (dm-) : .8G lvm /
sdb : 5G disk
└─sdb1 : 5G part
配置线路2
[root@node- ~]# iscsiadm -m discovery -t sendtargets -p 192.168.17.130:
192.168.17.130:, iqn.-.cn.sishen.www:target_san1
[root@node- ~]# tree /var/lib/iscsi/
/var/lib/iscsi/
├── ifaces
├── isns
├── nodes
│ └── iqn.-.cn.sishen.www:target_san1
│ ├── 192.168.17.130,,
│ │ └── default
│ └── 192.168.30.130,,
│ └── default
├── send_targets
│ ├── 192.168.17.130,
│ │ ├── iqn.-.cn.sishen.www:target_san1,192.168.17.130,,,default -> /var/lib/iscsi/nodes/iqn.-.cn.sishen.www:target_san1/192.168.17.130,,
│ │ └── st_config
│ └── 192.168.30.130,
│ ├── iqn.-.cn.sishen.www:target_san1,192.168.30.130,,,default -> /var/lib/iscsi/nodes/iqn.-.cn.sishen.www:target_san1/192.168.30.130,,
│ └── st_config
├── slp
└── static directories, files
客户端重启iscsi服务
[root@node- ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 : .6G rom /media/cdrom
sda : 20G disk
├─sda1 : 200M part /boot
├─sda2 : 2G part [SWAP]
└─sda3 : .8G part
└─vg_master-LogVol00 (dm-) : .8G lvm /
sdc : 5G disk
└─sdc1 : 5G part
sdb : 5G disk
└─sdb1 : 5G part
挂在数据测试
[root@node- ~]# mount /dev/sdb1 /opt/
[root@node- ~]# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 .0G 139M .6G % /opt
[root@node- ~]# ll /dev/sdb1
brw-rw---- root disk , Jun : /dev/sdb1
[root@node- ~]# ll /dev/sdc1
brw-rw---- root disk , Jun : /dev/sdc1
配置多路径实现冗余
[root@node- ~]# yum install -y device-mapper-multipath
[root@node- ~]# cp /usr/share/doc/device-mapper-multipath-0.4./multipath.conf /etc/
[root@node- ~]# /etc/init.d/multipathd restart
ux_socket_connect: No such file or directory
Stopping multipathd daemon: [FAILED]
Starting multipathd daemon: [ OK ]
[root@node- ~]# multipath -ll #没有反应，卸载/opt/下面的挂载重启multipath服务
[root@node- ~]# umount /opt/
[root@node- ~]# /etc/init.d/multipathd restart
ok
Stopping multipathd daemon: [ OK ]
Starting multipathd daemon: [ OK ]
[root@node- ~]# multipath -ll
mpatha (1IET ) dm- sishen,target-
size=.0G features='' hwhandler='' wp=rw
|-+- policy='round-robin 0' prio= status=active
| `- ::: sdc : active ready running
`-+- policy='round-robin 0' prio= status=enabled
`- ::: sdb : active ready running
[root@node- ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_master-LogVol00 18G .1G 13G % /
tmpfs .0G 72K .0G % /dev/shm
/dev/sda1 194M 35M 150M % /boot
/dev/sr0 .6G .6G % /media/cdrom
/dev/mapper/mpathap1 .0G 139M .6G % /opt
[root@node- ~]# ll /dev/mapper/mpatha*
lrwxrwxrwx root root Jun : /dev/mapper/mpatha -> ../dm-
lrwxrwxrwx root root Jun : /dev/mapper/mpathap1 -> ../dm-
配置负载均衡
[root@node- ~]# multipath -ll
mpatha (1IET ) dm- sishen,target-01 #远程存储设备的产品信息 dm-0 xuegod #厂商,target1 #产品ID
size=.0G features='' hwhandler='' wp=rw
|-+- policy='round-robin 0' prio= status=active
| `- ::: sdc : active ready running
`-+- policy='round-robin 0' prio= status=enabled
`- ::: sdb : active ready running
[root@node- ~]# cp /etc/multipath.conf{,.bak}
[root@node- ~]# vim /etc/multipath.conf
## Use user friendly names, instead of using WWIDs as names. #注释掉以下三行
#defaults {
# user_friendly_names yes
#}
multipaths {
multipath {
wwid "1IET 00010001" #
alias data-back
path_grouping_policy multibus
path_checker readsector0
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry
}
}
[root@node- ~]# /etc/init.d/multipathd restart
ok
Stopping multipathd daemon: [ OK ]
Starting multipathd daemon: [ OK ]
[root@node- ~]# /etc/init.d/iscsi restart
Stopping iscsi: [ OK ]
Starting iscsi: [ OK ]
[root@node- ~]# multipath -ll
Jun :: | multipath.conf line , invalid keyword: path_checker
data-back (1IET ) dm- sishen,target-
size=.0G features='1 queue_if_no_path' hwhandler='' wp=rw
`-+- policy='round-robin 0' prio= status=active
|- ::: sdb : active ready running
`- ::: sdc : active ready running
[root@node- ~]# vim /etc/multipath.conf
## Use user friendly names, instead of using WWIDs as names.，
#defaults {
# user_friendly_names yes
#}
#在62行修改或添加如下内容
multipaths {
multipath {
wwid "1IET 00010001"
alias data-back
path_grouping_policy multibus
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry
}
}
重启服务
[root@node- ~]# /etc/init.d/multipathd restart
ok
Stopping multipathd daemon: [ OK ]
Starting multipathd daemon: [ OK ]
[root@node- ~]# /etc/init.d/iscsi restart
Stopping iscsi: [ OK ]
Starting iscsi: [ OK ]
[root@node- ~]# multipath -ll
datashare (1IET ) dm- sishen,target-
size=.0G features='1 queue_if_no_path' hwhandler='' wp=rw
`-+- policy='round-robin 0' prio= status=active
|- ::: sdb : active ready running
`- ::: sdc : active ready running
[root@node- ~]# ll /dev/mapper/datashare*
lrwxrwxrwx root root Jun : /dev/mapper/datashare -> ../dm-
lrwxrwxrwx root root Jun : /dev/mapper/datasharep1 -> ../dm-
挂载测试
[root@node- ~]# mount /dev/mapper/datashare
datashare datasharep1
[root@node- ~]# mount /dev/mapper/datasharep1 /opt/
[root@node- ~]# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/datasharep1 .0G 139M .6G % /opt
[root@node- ~]# cp install.log /opt/
[root@node- ~]# ll /opt/
total
-rw-r--r-- root root Jun : install.log
drwx------ root root Jun : lost+found
模拟故障测试冗余
[root@master ~]# ifdown eth1 #手动停掉eth1
Device state: (disconnected)
[root@node- ~]# multipath -ll #这里大约需要60秒来识别，所以会卡在这里，等待即可
datashare (1IET ) dm- sishen,target-
size=.0G features='1 queue_if_no_path' hwhandler='' wp=rw
`-+- policy='round-robin 0' prio= status=active
|- ::: sdb : active faulty running
`- ::: sdc : active ready running
在服务端
[root@master ~]# ifdown eth1
Device state: (disconnected)
在客户端
[root@node- ~]# multipath -ll #回车之后等待大约60秒
datashare (1IET ) dm- sishen,target-
size=.0G features='1 queue_if_no_path' hwhandler='' wp=rw
`-+- policy='round-robin 0' prio= status=active
|- ::: sdb : failed faulty running
`- ::: sdc : active ready running #这里也要等待大约60秒
测试数据写入
[root@node- ~]# cp /etc/passwd /opt/
[root@node- ~]# ll /opt/
total
-rw-r--r-- root root Jun : install.log
drwx------ root root Jun : lost+found
-rw-r--r-- root root Jun : passwd
在服务端启动eth1
[root@master ~]# ifup eth1
Active connection state: activated
Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/
在客户端查看负载均衡
[root@node- ~]# multipath -ll #立刻就会显示结果
datashare (1IET ) dm- sishen,target-
size=.0G features='1 queue_if_no_path' hwhandler='' wp=rw
`-+- policy='round-robin 0' prio= status=active
|- ::: sdb : active ready running
`- ::: sdc : active ready running
#这里说明负载均衡正常
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