一.

共享磁盘服务器（target主机）：192.168.122.14

两台集群服务器（initiator主机）：192.168.122.12    192.168.122.13

target 主机配置：

1.yum install -y scsi-target-utils

2.vim /etc/tgt/targets.conf

<target iqn.2014-11.com.example:server.target1>

    backing-store /dev/vda1              需要共享的磁盘分区        initiator-address 192.168.122.12   需要共享到的initiator主机ip</target>3./etc/init.d/tgtd start                      启动tgt服务Starting SCSI target daemon:                               [  OK  ]

tgt服务器配置完毕，现在去initiator服务器进行配置

initiator主机配置：

1.yum install -y iscsi-initiator-utils

2.[root@server12 ~]# iscsiadm -m discovery -t st -p 192.168.122.14   看是否能够查询到服务器共享的磁盘192.168.122.14:3260,1 iqn.2014-11.com.example:server.target1

3.[root@server12 ~]# iscsiadm -m node -p 192.168.122.14 -l

Logging in to [iface: default, target: iqn.2014-11.com.example:server.target1, portal: 192.168.122.14,3260] (multiple)Login to [iface: default, target: iqn.2014-11.com.example:server.target1, portal: 192.168.122.14,3260] successful.4.fdisk -l               查看磁盘，可以看到共享到的第二块磁盘Disk /dev/sdb: 1073 MB, 1073741824 bytes34 heads, 61 sectors/track, 1011 cylindersUnits = cylinders of 2074 * 512 = 1061888 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

5.fdisk   -cu  /dev/sdb    将共享的sda分区

 6.partx -d /dev/sdb    partx -a /dev/sdb 7.  mkfs.ext4  /dev/sdb1 8.     mkdir /mnt/data         建立挂载路径 9.   vim /etc/fstab             设立开机自挂载   /dev/sdb1               /mnt/data               ext4    defaults,_netdev 0 010.mount -a11./etc/init.d/iscsi restart 12./etc/init.d/iscsid restart

二.利用共享的磁盘做lvm卷

7.[root@server12 ~]# pvcreate /dev/sdb    创建pv

  Writing physical volume data to disk "/dev/sdb"  Physical volume "/dev/sdb" successfully created  8.[root@server12 ~]# pvs                     查看pv  PV         VG       Fmt  Attr PSize PFree  /dev/sda2  VolGroup lvm2 a--  5.51g    0   /dev/sdb            lvm2 a--  1.00g 1.00g9.[root@server12 ~]# vgcreate net_vg /dev/sdb  创建  Volume group "net_vg" successfully created 10.[root@server12 ~]# vgs         查看vgs  VG       #PV #LV #SN Attr   VSize    VFree     VolGroup   1   2   0 wz--n-    5.51g       0   net_vg     1   0   0 wz--n- 1020.00m 1020.00m11.[root@server12 ~]# lvcreate -L 500M -n net_lv1 net_vg  创建lv  Logical volume "net_lv1" created12.格式化文件系统[root@server12 ~]# mkfs.ext4 /dev/net_vg/net_lv1 mke2fs 1.41.12 (17-May-2010)Filesystem label=OS type: LinuxBlock size=1024 (log=0)Fragment size=1024 (log=0)Stride=0 blocks, Stripe width=0 blocks128016 inodes, 512000 blocks25600 blocks (5.00%) reserved for the super userFirst data block=1Maximum filesystem blocks=6763315263 block groups8192 blocks per group, 8192 fragments per group2032 inodes per groupSuperblock backups stored on blocks:     8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409Writing inode tables: done                            Creating journal (8192 blocks): doneWriting superblocks and filesystem accounting information: doneThis filesystem will be automatically checked every 29 mounts or180 days, whichever comes first.  Use tune2fs -c or -i to override.

然后就可以像（一.8）一样进行挂载了

三.双路径磁盘共享

共享磁盘服务器（target主机）：192.168.122.14     192.168.122.114   双网卡

两台集群服务器（initiator主机）：192.168.122.12    192.168.122.13

target主机启动双网卡以后。进行配置文件的修改，然后启动tgtd就可以了

集群服务器配置：

1.确保initiator主机识别到不同ip的共享磁盘内容一样

[root@server12 ~]# iscsiadm -m discovery -t st -p 192.168.122.114

192.168.122.114:3260,1 iqn.2014-10.com.example:server.target1

2.[root@server12 ~]# iscsiadm -m node -p 192.168.122.14 -lLogging in to [iface: default, target: iqn.2014-10.com.example:server.target1, portal: 192.168.122.14,3260] (multiple)Login to [iface: default, target: iqn.2014-10.com.example:server.target1, portal: 192.168.122.14,3260] successful.[root@server12 ~]# iscsiadm -m node -p 192.168.122.114 -lLogging in to [iface: default, target: iqn.2014-10.com.example:server.target1, portal: 192.168.122.114,3260] (multiple)Login to [iface: default, target: iqn.2014-10.com.example:server.target1, portal: 192.168.122.114,3260] successful.

3.yum list device-mapper*   安装磁盘的传输用的软件  

yum install device-mapper.x86_64 device-mapper-event.x86_64 device-mapper-event-libs.x86_64 device-mapper-libs.x86_64 device-mapper-event-libs.i686 device-mapper-multipath.x86_64 device-mapper-multipath-libs.x86_64 device-mapper-persistent-data.x86_64

4.mpathconf –enable   生成配置文件

5.vim /etc/multipath.conf  修改配置文件

blacklist {

        devnode "sda"}6.

multipaths {

#       multipath { #               wwid                    3600508b4000156d700012000000b0000#               alias                   yellow#               path_grouping_policy    multibus#               path_checker            readsector0#               path_selector           "round-robin 0"#               failback                manual#               rr_weight               priorities#               no_path_retry           5#       }        multipath {                 wwid                    "1IET     00010001"                alias                   helloc        }}

其中 wwid 是你用 multipath -l 查看的。

alias 别名blacklist 黑名单

黑名单过滤不参与多路径配置的设备，如本地磁盘

eg:[root@server12 multipath]# multipath -l                 查看wwid

mpathb (1IET     00010001) dm-2 IET,VIRTUAL-DISKsize=500M features='0' hwhandler='0' wp=rw|-+- policy='round-robin 0' prio=0 status=active| `- 7:0:0:1 sdb 8:16 active undef running`-+- policy='round-robin 0' prio=0 status=enabled  `- 8:0:0:1 sdc 8:32 active undef running

7.配置完成之后，重启multipathd服务，使用下面的命令清空已有的multipath记录

   #multipath -F    然后使用multipath -v2重新扫描设备，这时会在/dev/mapper/目录下生成和别名对应的设备文件。

control           helloc            VolGroup-lv_root  VolGroup-lv_swap

8.安装 sysstat     监测系统性能及效率

watch sysstat