CentOS 6.3 under Configuration Multipah

1. Determine if the system is in accordance with Multipath

Rpm-qa|grep Device-mapper-multipath

2. Reload the new HBA store (if not the HBA storage, do not do this step)

Modprobe-r Lpfcmodprobe LPFC

3. Installing Multipath

Yum Install Device-mapper-multipath

4. Check if the multipath is loaded correctly, run the following command if it is not loaded, or restart the operating system

Lsmod|grep Multipath[[email protected] ~]# lsmod|grep multdm_multipath 17649 1 dm_round_robindm_mod 81692 dm_multipath,dm_mirror,dm_log# Reload driver [[email protected] ~]# modprobe dm-multipath[[email protected] ~]# MODP Robe Dm-round-robin

5. Set the Multipath service to start automatically and start the Multipath service

Chkconfig MULTIPATHD on service MULTIPATHD start

6. Multipath Basic Operation command

Service multipath start #启动multipath multipath-f #删除无效路径 multipath-v2 #检查路径, merge path, format Multipath-ll #检查路径状态 of the path

7. Configure/etc/multipath.conf, add the following:

Blacklist{devnode "^sda"}defaults {user_friendly_names yesudev_dir/devpath_grouping_policy multibusfailback Immediateno_path_retry fail}

8. Get the Wwid of the disk via the scsi_id command

Here are a few things to look out for

1, first, through the scsi_id to obtain the WWID device name, you must be able to find the device through the fdisk-l command

2. Be careful not to use the kind of/sbin/scsi_id-s that is said online-g/block/sdb such, can not find out wwid, change/dev/sdb so

3. Regarding the scsi_id command, Linux has a bug, reference 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, modify the multipath.conf configuration file to achieve the persistence of the device

Add the following to the configuration file:

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        &nBsp;              path_grouping_policy     multibus                       path_checker             readsector0                       path_selector             "Round-robin 0"                        failback                 manual                       rr_ weight               priorities                       no _path_retry           5                   }          }

10. Restart Multipath Service

This article is from the "Database Road" blog, make sure to keep this source http://dbaway.blog.51cto.com/7099215/1683942

CentOS 6.3 under Configuration Multipah