RHEL6配置multipath多路徑軟件連存儲

RHEL6與5在多路徑的配置上有一些小區別。scsi_id命令有些參數不再支持。在RHEL 6中獲取磁盤的wwid可以通過–whitelist參數獲取:

[root@db1 ~]# scsi_id --whitelist /dev/sdg 360060160a2212f00f8139df761ece111

可以通過一條shell命令，來獲取系統所有磁盤的wwid：

# for i in `cat /proc/partitions ¦ awk {'print $4'} ¦grep sd`; do echo "### $i: `scsi_id --whitelist /dev/$i`"; done

在RHEL 5中，可以通過如下方式獲取磁盤wwid：

# for i in `cat /proc/partitions ¦ awk {'print $4'} ¦grep sd`; do echo "### $i: `scsi_id -g -u -s /block/$i`"; done

另外，RHEL 6中，多路徑配置文件也出現變化：

    # multipath.conf written by anaconda
    defaults {
    user_friendly_names yes
    }
    blacklist {
    devnode "^(ramrawloopfdmddm-srscdst)[0-9]*"
    devnode "^hd[a-z]"
    devnode "^dcssblk[0-9]*"
    device {
    vendor "DGC"
    product "LUNZ"
    }
    device {
    vendor "IBM"
    product "S/390.*"
    }
    # don't count normal SATA devices as multipaths
    device {
    vendor "ATA"
    }
    # don't count 3ware devices as multipaths
    device {
    vendor "3ware"
    }
    device {
    vendor "AMCC"
    }
    # nor highpoint devices
    device {
    vendor "HPT"
    }
    wwid "20080930-1"
    wwid "20080930-1"
    device {
    vendor Cisco
    product Virtual_CD_DVD
    }
    wwid "*" //其實可以注釋這項，這樣就不需要單獨填寫blacklist_exceptions
    }
    blacklist_exceptions { //排除在黑名單之外的wwid
    wwid "360060160a2212f00a67e0b91f2dbe111"
    wwid "360060160a2212f0044a0fc6ef5eae111"
    }
    multipaths {
    multipath {
    uid 0 //磁盤讀所屬用戶uid
    gid 0 //磁盤所屬組gid
    wwid "360060160a2212f00a67e0b91f2dbe111" //wwid號
    mode 0600 //磁盤讀寫權限
    }
    multipath {
    wwid "360060160a2212f0044a0fc6ef5eae111"
    alias data //別名
    }
    ... ... //還可以根據實際情況，配置其它磁盤的別名、uid、gid、mode etc...
    }

配置完了之後，重啟multipathd服務，之後通過multipath -ll查看經過多路徑軟件綁定後的磁盤。
注意，如果要對磁盤進行格式化，請采用/dev/mapper/[alias]這類設備名進行fdisk。