主機安裝HBA卡驅動，一般光纖卡的廠家就是QLogic和Emulex的。
Linux下查看光纖卡驅動模塊是否加載通過
lsmod |grep qla2xxx #查看是否加載了QLogic的光纖卡模塊 lsmod |grep lpfc #查看是否加載了Emulex的光纖卡模塊 modprobe lpfc #加載相應的光纖卡模塊
Windows下查看設備管理器查看是否加載了驅動（如果沒有的話安裝相應的光纖卡驅動）。
2. 查看光纖卡的WWN號（記錄下來爲存儲設備映射時使用）
Linux
more /sys/class/fc_host/host1/node_name #根據光纖卡端口的數量可能會有host1，host2等。
Windows
wmic /namespace:\\root\wmi path MSFC_FCAdapterHBAAttributes get /value #查看PortWWN號碼，是10進制的，需要轉換到16進制（其實一般只需要把最後的號碼轉換一下，在存儲設備中能夠識別出來是那臺主機即可）
3. 存儲設備映射捲到主機
FC存儲設備是通過WWN號來識別主機的，此處把劃出來的卷分配給相應主機的WWN號碼即可。
4. 安裝多路徑軟件
Linux
yum list |grep device-mapper #查找多路徑包 yum install device-mapper-multipath #CentOS下安裝多路徑軟件
suse 通過yast或zypper安裝，Ubuntu 通過 apt-get安裝。兩個包：device-mapper和device-mapper-multipath包。搜索一下安裝這兩個包，名字各版本可能有差別。
Windows 2008以上
服務器管理--功能--添加功能--選擇Multipath IO包安裝。然後選擇管理員工具-MPIO--發現多路徑選項卡--添加即可，重啓後即可看到效果。
5. Linux多路徑配置文件
centos 5.x
修改/etc/multipath.conf
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy failover
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/bin/true"
path_checker tur
rr_min_io 100
rr_weight uniform
failback immediate
no_path_retry 12
user_friendly_names yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z][[0-9]*]"
}
devices {
device {
vendor "HP|COMPAQ"
product "HSV1[01]1 \(C\)COMPAQ|HSV2[01]0|HSV300|HSV4[05]0"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "P2000 G3 FC|P2000G3 FC/iSCSI"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "OPEN-.*"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 1000
}
device {
vendor "HP"
product "MSA VOLUME*"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2012sa|MSA2312sa|MSA2324sa"
path_grouping_policy group_by_prio
getuid_callout "/sbin/hp_scsi_id -g -u -n -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua %d"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2312fc|MSA2324fc|MSA2312i|MSA2324i"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "/sbin/mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2[02]12fc|MSA2012i"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 100
}
}centos 6.x-7.0
mpathconf --enable --with_multipathd y #簡化了配置，同樣也可以使用5.x的配置文件
suse
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy failover
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
prio const
path_checker tur
rr_min_io 100
rr_weight uniform
failback immediate
no_path_retry 12
user_friendly_names yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z][[0-9]*]"
}
devices {
device {
vendor "HP|COMPAQ"
product "HSV1[01]1 \(C\)COMPAQ|HSV2[01]0|HSV300|HSV4[05]0"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "P2000 G3 FC|P2000G3 FC/iSCSI"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "OPEN-.*"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 1000
}
device {
vendor "HP"
product "MSA VOLUME*"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2312fc|MSA2324fc|MSA2312i|MSA2324i|MSA2012sa|MSA2312sa|MSA2324sa|MSA2000s VOLUME"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2[02]12fc|MSA2012i"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 100
}
}ubuntu
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy failover
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
prio_callout "/bin/true"
path_checker tur
rr_min_io 100
rr_weight uniform
failback immediate
no_path_retry 12
user_friendly_names yes
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda)[0-9]*"
devnode "^hd[a-z][[0-9]*]"
devnode "^cciss!c[0-9]d[0-9]*"
}
devices {
device {
vendor "HP|COMPAQ"
product "HSV1[01]1 \(C\)COMPAQ|HSV2[01]0|HSV3[046]0|HSV4[05]0"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "P2000 G3 FC|P2000G3 FC/iSCSI"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "OPEN-.*"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 1000
}
device {
vendor "HP"
product "MSA VOLUME*"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2012sa|MSA2312sa|MSA2324sa"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/hp_scsi_id -g -u -n /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "mpath_prio_alua %d"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2312fc|MSA2324fc|MSA2312i|MSA2324i"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_checker tur
path_selector "round-robin 0"
prio_callout "mpath_prio_alua /dev/%n"
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
device {
vendor "HP"
product "MSA2[02]12fc|MSA2012i"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id -g -u /block/%n"
path_selector "round-robin 0"
rr_weight uniform
path_checker tur
hardware_handler "0"
failback immediate
no_path_retry 18
rr_min_io 100
}
}其實各Linux發行版都是使用Redhat開發的multipath包，只是有些命令的位置不同而已。修改一下就可以適用與各linux系統。
具體的配置參數信息請參考：
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/
6. Linux 配置多路徑命令
centos 5.x
chkconfig --list|grep multipathd #查看多路徑服務是否開機啓動 chkconfig multipathd on #開機打開多路徑服務 service multipathd start #打開多路徑服務 multipath #配置多路徑 -vn n爲數字，可以顯示更多信息 multipath -ll #查看多路徑設備和信息
其他
multipath multipath -ll
在啓用了user_friendly_names配置後設備名爲 /dev/mapper/mpathn,其中n爲字母，這個是在系統啓動時就已經創建的，可以直接使用。不要直接操作 /dev/dm-n（內部使用） 或是 /dev/mpath/mpathn（udev創建，啓動中無法使用），因爲它們爲系統所使用。
7. 排錯
multipathd -k #進入交互模式，具體請查看 man multipathd >list|show config >reconfigure >list|show path
小技巧：當存儲添加了新的映射時，我們可以使用下面的命令讓系統重新識別設備而無需重啓。
echo 1 >/sys/class/fc_host/host0/issue_lip echo 1 >/sys/class/fc_host/host1/issue_lip echo "- - -" >/sys/class/scsi_host/host0/scan echo "- - -" >/sys/class/scsi_host/host1/scan