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环境: iscsi server : openfiler eth0/eth1 bind->192.108.26.100 iqn.2006-01.com.openfiler:tsn.b45ae024d498 iqn.2006-01.com.openfiler:tsn.67571ed98f10 iscsi client : CentOS 6.6 eth1->192.108.26.117 eth2->192.108.26.118 1.安装iscsi-initiator [root@ct6601 ~]# yum install -y iscsi-initiator-utils 2.安装device-mapper-multipath [root@ct6601 ~]# yum install -y device-mapper-multipath 3.设定multipathd服务开机自启动 [root@ct6601 etc]# chkconfig multipathd on 4.测试网卡eth1,eth2能否ping通iscsi server [root@ct6601 ~]# ping -I eth1 192.108.26.100 [root@ct6601 ~]# ping -I eth2 192.108.26.100 5.在/etc/sysctl.conf添加以下,否则在第8步可能一直timeout [root@ct6601 ~]# cat >> /etc/sysctl.conf << EOF net.ipv4.conf.eth1.rp_filter=2 net.ipv4.conf.eth2.rp_filter=2 EOF [root@ct6601 ~]# sysctl -p 6.修改/etc/iscsi/iscsid.conf中的timeout时间 [root@ct6601 ~]# cat /etc/iscsi/iscsid.conf |grep timeout|grep -v ^# node.session.timeo.replacement_timeout = 2 node.conn[0].timeo.login_timeout = 2 node.conn[0].timeo.logout_timeout = 2 node.conn[0].timeo.noop_out_timeout = 2 node.session.err_timeo.abort_timeout = 2 node.session.err_timeo.lu_reset_timeout = 2 node.session.err_timeo.tgt_reset_timeout = 2 7.建iscsi iface [root@ct6601 ~]# iscsiadm -m iface -I iface1 -o new [root@ct6601 ~]# iscsiadm -m iface -I iface2 -o new #查看/var/lib/iscsi/下的文件 [root@ct6601 ~]# cd /var/lib/iscsi/ [root@ct6601 iscsi]# du -sh * 12K ifaces 4.0K isns 4.0K nodes 4.0K send_targets 4.0K slp 4.0K static #绑定iscsi iface到网卡 [root@ct6601 iscsi]# iscsiadm -m iface -I iface1 -o update -n iface.net_ifacename -v eth1 [root@ct6601 iscsi]# iscsiadm -m iface -I iface2 -o update -n iface.net_ifacename -v eth2 8.发现iscsi target [root@ct6601 iscsi]# iscsiadm -m discovery -t st -p 192.108.26.100 -I iface1 -I iface2 Starting iscsid: [ OK ] 192.108.26.100:3260,1 iqn.2006-01.com.openfiler:tsn.b45ae024d498 192.108.26.100:3260,1 iqn.2006-01.com.openfiler:tsn.67571ed98f10 192.108.26.100:3260,1 iqn.2006-01.com.openfiler:tsn.b45ae024d498 192.108.26.100:3260,1 iqn.2006-01.com.openfiler:tsn.67571ed98f10 #发现后相关文件已经生成 [root@ct6601 iscsi]# du -sh * 12K ifaces 4.0K isns 36K nodes 28K send_targets 4.0K slp 4.0K static 9.启动iscsi服务,建立连接 [root@ct6601 iscsi]# service iscsi start 10.查看连接信息及iscsi盘 [root@ct6601 ~]# iscsiadm -m session -P 1 Target: iqn.2006-01.com.openfiler:tsn.b45ae024d498 (non-flash) Current Portal: 192.108.26.100:3260,1 Persistent Portal: 192.108.26.100:3260,1 ********** Interface: ********** Iface Name: iface1 Iface Transport: tcp Iface Initiatorname: iqn.1994-05.com.RedHat:bfec8c6a9151 Iface IPaddress: 192.108.26.117 Iface HWaddress: <empty> Iface Netdev: eth1 SID: 5 iSCSI Connection State: LOGGED IN iSCSI Session State: LOGGED_IN Internal iscsid Session State: NO CHANGE ********** Interface: ********** Iface Name: iface2 Iface Transport: tcp Iface Initiatorname: iqn.1994-05.com.redhat:bfec8c6a9151 Iface IPaddress: 192.108.26.118 Iface HWaddress: <empty> Iface Netdev: eth2 SID: 6 iSCSI Connection State: LOGGED IN iSCSI Session State: LOGGED_IN Internal iscsid Session State: NO CHANGE Target: iqn.2006-01.com.openfiler:tsn.67571ed98f10 (non-flash) Current Portal: 192.108.26.100:3260,1 Persistent Portal: 192.108.26.100:3260,1 ********** Interface: ********** Iface Name: iface1 Iface Transport: tcp Iface Initiatorname: iqn.1994-05.com.redhat:bfec8c6a9151 Iface IPaddress: 192.108.26.117 Iface HWaddress: <empty> Iface Netdev: eth1 SID: 7 iSCSI Connection State: LOGGED IN iSCSI Session State: LOGGED_IN Internal iscsid Session State: NO CHANGE ********** Interface: ********** Iface Name: iface2 Iface Transport: tcp Iface Initiatorname: iqn.1994-05.com.redhat:bfec8c6a9151 Iface IPaddress: 192.108.26.118 Iface HWaddress: <empty> Iface Netdev: eth2 SID: 8 iSCSI Connection State: LOGGED IN iSCSI Session State: LOGGED_IN Internal iscsid Session State: NO CHANGE #查看iscsi盘 [root@ct6601 iscsi]# fdisk -l Disk /dev/sda: 32.2 GB, 32212254720 bytes 255 heads, 63 sectors/track, 3916 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: 0x0001e517 Device Boot Start End Blocks Id System /dev/sda1 1 523 4194304 82 linux swap / Solaris Partition 1 does not end on cylinder boundary. /dev/sda2 * 523 3917 27261952 83 Linux Disk /dev/sdb: 42.9 GB, 42949672960 bytes 64 heads, 32 sectors/track, 40960 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xfef2bf25 Disk /dev/sdc: 42.9 GB, 42949672960 bytes 64 heads, 32 sectors/track, 40960 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xfef2bf25 Disk /dev/sdd: 42.9 GB, 42949672960 bytes 64 heads, 32 sectors/track, 40960 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xab210de1 Disk /dev/sde: 42.9 GB, 42949672960 bytes 64 heads, 32 sectors/track, 40960 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xab210de1 11.查看wwid [root@ct6601 ~]# scsi_id -gu /dev/sdb 14f504e46494c45527646546462502d716247302d7a61554b [root@ct6601 ~]# scsi_id -gu /dev/sdc 14f504e46494c45527646546462502d716247302d7a61554b [root@ct6601 ~]# scsi_id -gu /dev/sdd 14f504e46494c45524b61654859532d47436c612d30625046 [root@ct6601 ~]# scsi_id -gu /dev/sde 14f504e46494c45524b61654859532d47436c612d30625046 12.配置 /etc/multipath.conf [root@ct6601 etc]# cat /etc/multipath.conf defaults { user_friendly_names yes } multipaths { multipath { wwid 14f504e46494c45527646546462502d716247302d7a61554b alias dm1 path_grouping_policy multibus failback manual rr_weight priorities no_path_retry 5 } multipath { wwid 14f504e46494c45524b61654859532d47436c612d30625046 alias dm2 path_grouping_policy multibus failback manual rr_weight priorities no_path_retry 5 } } 13.启动multipathd [root@ct6601 etc]# service multipathd restart 14.查看multipath信息及mapper盘 [root@ct6601 ~]# multipath -ll dm2 (14f504e46494c45524b61654859532d47436c612d30625046) dm-1 OPNFILER,VIRTUAL-DISK size=40G features='1 queue_if_no_path' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=1 status=active |- 6:0:0:0 sdd 8:48 active ready running `- 5:0:0:0 sde 8:64 active ready running dm1 (14f504e46494c45527646546462502d716247302d7a61554b) dm-0 OPNFILER,VIRTUAL-DISK size=40G features='1 queue_if_no_path' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=1 status=active |- 3:0:0:0 sdb 8:16 active ready running `- 4:0:0:0 sdc 8:32 active ready running [root@ct6601 etc]# ll /dev/mapper/ total 0 crw-rw---- 1 root root 10, 58 May 11 08:28 control lrwxrwxrwx 1 root root 7 May 11 09:27 dm1 -> ../dm-0 lrwxrwxrwx 1 root root 7 May 11 09:27 dm2 -> ../dm-1 15.验证可用性 略. 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