使用multipath创建asm磁盘

使用multipath创建asm磁盘 创建asm磁盘的方法格式各样,本文主要为了标准化,统一采用multipath与udev结合管理asm磁盘.适用于linux6 ,linux7,多路径或者单一路径. 以下操作使用oracle linux 7为例. 1.安装multipath软件 yum源使用oracle官方源或者本地iso源 [root@oel7 ~]# yum provides multipath Loaded plugins: ulninfo device-mapper-multipath-0.4.9-119.el7.x86_64 : Tools to manage multipath devices using device-mapper Repo        : dbinstall Matched from: Filename    : /usr/sbin/multipath # yum install device-mapper-multipath-0.4.9-119.el7.x86_64 2.加载模块&创建配置文件 初次安装需要加载dm模块 # modprobe dm-multipath # modprobe dm-round-robin # cp /usr/share/doc/device-mapper-multipath-*/multipath.conf  /etc/multipath.conf 3.编辑配置文件 /etc/multipath.conf devices {     device {         vendor            "VMware, "         product            "VMware Virtual S"         path_grouping_policy    multibus         path_checker        readsector0         path_selector        "round-robin 0"         hardware_handler    "0"         failback        15         rr_weight        priorities         no_path_retry        queue     } } multipaths {        multipath {                wwid                    36000c29b9e405c3d07021157ace9ab9f                alias                   asm_data01        }        multipath {                wwid                    36000c2933be13ffabcb0ce90806ea5dd                alias                   asm_fra01        } } 4.查看multipath设备 重启服务 # systemctl restart multipathd # multipath -ll 由于是虚拟机且非多路径,并没有生成相关设备.此时我们手动添加wwid到multipath信息库.若为真实多路径,无需手动添加 multipath -a /dev/sdb multipath -a /dev/sdc 再次重启服务 # systemctl restart multipathd 查看设备 # multipath -ll asm_fra01 (36000c2933be13ffabcb0ce90806ea5dd) dm-3 VMware, ,VMware Virtual S size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=1 status=active   `- 0:0:2:0 sdc             8:32  active ready running asm_data01 (36000c29b9e405c3d07021157ace9ab9f) dm-2 VMware, ,VMware Virtual S size=30G features='1 queue_if_no_path' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=1 status=active   `- 0:0:1:0 sdb             8:16  active ready running 5.配置udev规则 前面做了这么多工作主要为了udev规则配置简单 来看下multipath管理的设备特点 [root@oel7 ~]# udevadm info -q all -n /dev/mapper/asm_data01 P: /devices/virtual/block/dm-2 N: dm-2 L: 10 S: disk/by-id/dm-name-asm_data01 S: disk/by-id/dm-uuid-mpath-36000c29b9e405c3d07021157ace9ab9f S: disk/by-label/DATA1 S: mapper/asm_data01 E: DEVLINKS=/dev/disk/by-id/dm-name-asm_data01 /dev/disk/by-id/dm-uuid-mpath-36000c29b9e405c3d07021157ace9ab9f /dev/disk/by-label/DATA1 /dev/mapper/asm_data01 E: DEVNAME=/dev/dm-2 E: DEVPATH=/devices/virtual/block/dm-2 E: DEVTYPE=disk E: DM_MULTIPATH_TIMESTAMP=1536682254 E: DM_NAME=asm_data01 E: DM_SUSPENDED=0 E: DM_UDEV_DISABLE_LIBRARY_FALLBACK_FLAG=1 E: DM_UDEV_PRIMARY_SOURCE_FLAG=1 E: DM_UDEV_RULES_VSN=2 E: DM_UUID=mpath-36000c29b9e405c3d07021157ace9ab9f E: ID_FS_LABEL=DATA1 E: ID_FS_LABEL_ENC=DATA1 E: ID_FS_TYPE=oracleasm E: ID_FS_USAGE=filesystem E: MAJOR=249 E: MINOR=2 E: MPATH_SBIN_PATH=/sbin E: SUBSYSTEM=block E: TAGS=:systemd: E: USEC_INITIALIZED=83840 利用着色部分做udev规则 cat >> /etc/udev/rules.d/99-oracle-asmdevices.rules <<END KERNEL=="dm-*",ENV{DM_UUID}=="mpath-?*",ENV{DM_NAME}=="asm_?*",OWNER="grid",GROUP="asmadmin",MODE="0660" END 启动udev # udevadm trigger -c change linux6用start_udev 查看权限 [root@oel7 ~]# ll /dev/dm* brw-rw----. 1 root disk     249, 0 Sep 12 00:33 /dev/dm-0 brw-rw----. 1 root disk     249, 1 Sep 12 00:33 /dev/dm-1 brw-rw----. 1 grid asmadmin 249, 2 Sep 12 00:33 /dev/dm-2 brw-rw----. 1 grid asmadmin 249, 3 Sep 12 00:33 /dev/dm-3 至此asm磁盘就创建成功了.