CentOS 6.3下配置multipah

標籤：multipath centos

1. 判斷系統是否按照multipath

     rpm -qa|grep device-mapper-multipath

2. 重新載入新增的HBA儲存（如果不是HBA儲存，不用做這一步）

modprobe -r lpfcmodprobe lpfc

3. 安裝multipath

   yum install device-mapper-multipath

4. 檢查multipath是否正確載入，如果沒有載入，運行下面命令，或者重啟作業系統

lsmod|grep multipath[[email protected] ~]# lsmod|grep multdm_multipath           17649  1 dm_round_robindm_mod                 81692  12 dm_multipath,dm_mirror,dm_log#重新載入驅動[[email protected] ~]# modprobe dm-multipath[[email protected] ~]# modprobe dm-round-robin

5. 設定multipath服務自動啟動並啟動multipath服務

 chkconfig multipathd on service multipathd start

6. multipath基本操作命令

   service multipath start  #啟動multipath   multipath -F                  #刪除無效路徑   multipath -v2                #檢查路徑，合并路徑，格式化路徑   multipath -ll                  #檢查路徑狀態

7. 配置/etc/multipath.conf,添加下面內容

blacklist{devnode "^sda"}defaults {user_friendly_names yesudev_dir /devpath_grouping_policy multibusfailback immediateno_path_retry fail}

8. 通過scsi_id 命令擷取磁碟的wwid

    這裡有幾點需要注意一下

    1， 首先，通過scsi_id擷取wwid的裝置名稱，必須可以通過fdisk -l命令可以查到的裝置

    2.   注意不要使用網上說的那種 /sbin/scsi_id -s -g /block/sdb 這樣，查不出來wwid的，改為 /dev/sdb這樣就可以了

    3. 關於scsi_id 命令，Linux有個bug，參考 scsi_id does not return WWID for /dev/sda with aacraid driver

https://bugzilla.redhat.com/show_bug.cgi?id=445696

[[email protected] ~]# /sbin/scsi_id -u -g /dev/mapper/mpatha14f504e46494c45526d56564a4b6f2d6a4e66552d77434947[[email protected] ~]# /sbin/scsi_id -u -g /dev/mapper/mpathb14f504e46494c4552516a6d535a652d637576712d6f726250[[email protected] ~]# /sbin/scsi_id -u -g /dev/mapper/mpathc14f504e46494c45527a4e387762672d715632712d68396951[[email protected] ~]# /sbin/scsi_id -u -g /dev/mapper/mpathd14f504e46494c45526a4c5a6b58632d395a56312d42527652[[email protected] ~]# /sbin/scsi_id -u -g /dev/mapper/mpathe14f504e46494c45526c36694345372d524761642d32736c77

9， 修改multipath.conf設定檔，實現裝置的持久化

添加下面內容到設定檔：

multipaths {        multipath {                      wwid                    14f504e46494c45526d56564a4b6f2d6a4e66552d77434947                      alias                   rac-disk-01                      path_grouping_policy    multibus                      path_checker            readsector0                      path_selector           "round-robin 0"                      failback                manual                      rr_weight               priorities                      no_path_retry           5                  }        multipath {                      wwid                    14f504e46494c4552516a6d535a652d637576712d6f726250                      alias                   rac-disk-02                      path_grouping_policy    multibus                      path_checker            readsector0                      path_selector           "round-robin 0"                      failback                manual                      rr_weight               priorities                      no_path_retry           5                  }        multipath {                      wwid                    14f504e46494c45527a4e387762672d715632712d68396951                      alias                   asm-disk-01                      path_grouping_policy    multibus                      path_checker            readsector0                      path_selector           "round-robin 0"                      failback                manual                      rr_weight               priorities                      no_path_retry           5                  }        multipath {                      wwid                    14f504e46494c45526a4c5a6b58632d395a56312d42527652                      alias                   asm-disk-02                      path_grouping_policy    multibus                      path_checker            readsector0                      path_selector           "round-robin 0"                      failback                manual                      rr_weight               priorities                      no_path_retry           5                  }        multipath {                      wwid                    14f504e46494c45526c36694345372d524761642d32736c77                      alias                   asm-disk-03                      path_grouping_policy    multibus                      path_checker            readsector0                      path_selector           "round-robin 0"                      failback                manual                      rr_weight               priorities                      no_path_retry           5                  }         }

10。 重啟multipath服務

本文出自 “資料庫之路” 部落格，請務必保留此出處http://dbaway.blog.51cto.com/7099215/1683942

CentOS 6.3下配置multipah