1.概述RAC数据库扩容存储空间，新挂载的磁盘无法识别，fdisk-l命令也看不到。检查后需要重启或扫描才能看到新挂载的磁盘。今天分享一下具体的方法。环境：OEL6.4和RAC11.2.0.42.要点不要使用/dev/sdX或/dev/dm-XX作为设备名称，因为这个设备名称在重启后可能会改变使用WWID标识设备全局标识符（WWID)可用于可靠地识别磁盘设备。WWID是一个持久的、独立于系统的ID，SCSI标准要求所有SCSI设备提供它。三、显示系统上所有可用的WWIDShell脚本在您的系统上显示WWID#!/bin/bash##Usage:作为root用户运行：./check_wwid.sh#forFILEin`find/dev-name"sd*"|sort`doWWID=`scsi_id--whitelisted--replace-whitespace--device=$FILE`echo$FILE"WWID:"$WWIDdone$sudo./check_wwid.sh../dev/sdbWWID:1ATA_VBOX_HARDDISK_VB81c4f844-94203a15/dev/sdb1WWID:1ATA_VBOX_HARDDISK_VB81c4f844-94203a15/dev/sdcWWID:1ATA_VBOX_HARDDISK_VB2ed83c09-e66dbcfb/dev/sdc1WWID:1ATA_VBOX_HARDDISK_VB2ed83c09-e66dbcfb..-->OfcourseWWIDsforpartitionsandforthecompletediskareidentical#cat99-oracle-asmdevices.rulesKERNEL=="sd*",SUBSYSTEM=="block",ENV{DEVTYPE}=="disk",ENV{ID_SERIAL}=="14f504e46494c45523264556151442d5261336d2d566e4250",OWNER="grid",GROUP="asmadmin",MODE="0660"#ls-ls/dev/sdr0brw-rw----。1gridasmadmin65,16Mar1914:42/dev/sdrReloadandRestarttheudevrules#udevadmcontrol--reload-rules#start_udev启动udev：[确定]验证磁盘保护：#ls-ltr/dev/asm*brw-rw----。1gridasmadmin8,17Mar1510:03/dev/asmdisk1_udev_sdb1brw-rw----。1gridasmadmin8,33Mar1510:03/dev/asmdisk2_udev_sdc1Redistribute99-oracle-asmdevices.rulesfiletoallclusternodesandrestatudevechosystemonthesenodes#scp99-oracle-asmdevices.rulesgrac42:/etc/udev/rules.d#scp99-oracle-asmdevices.rulesgrac43:/etc/udev/rules.d在每个RAC节点上#udevadmcontrol--reload-rules#start_udev#ls-ltr/dev/asm*brw-rw----。1gridasmadmin8,17Mar1510:03/dev/asmdisk1_udev_sdb1brw-rw----。1gridasmadmin8,33Mar1510:03/dev/asmdisk2_udev_sdc14.UDev使用/sbin/scsi_id规则的磁盘分区（首选模式，因为我们可以更改名称）注意此示例映射：/dev/sdb1到/dev/asmdisk1_udev_sdb1:#cat99-oracle-asmdevices.rulesKERNEL="sd?1",BUS="scsi",PROGRAM=="/sbin/scsi_id-g-u-d/dev/$parent",RESULT==“1ATA_VBOX_HARDDISK_VB81c4f844-94203a15”,NAME="asmdisk1_udev_sdb1",OWNER="grid",GROUP="asmadmin",MODE="0660"KERNEL="sd?1",BUS="scsi",PROGRAM="/sbin/scsi_id-g-u-d/dev/$parent",RESULT=="1ATA_VBOX_HARDDISK_VB2ed83c09-e66dbcfb",NAME="asmdisk1_udev_sdc1",OWNER="grid",GROUP="asmadmin",MODE="0660"#ls-l/dev/asmdisk1_udev_sdb1/dev/asmdisk1_udev_sdc1brw-rw----。1gridasmadmin8,17Mar1913:53/dev/asmdisk1_udev_sdb1brw-rw----。1网格asmadmin8，2019年3月33日13:53/dev/asmdisk1_udev_sdc15。磁盘组（1）展开磁盘组查找路径：selectgroup_number,disk_number,pathfromv$asm_disk；扩展磁盘组：alterdiskgroupdata2adddisk'/dev/asm-diski';改变磁盘组数据2重新平衡功率10；CheckYesEqualizationcompleted:selectoperation,est_minutesfromv$asm_operation;完成后修改回来：alterdiskgroupDATArebalancepower1;或者：直接做均衡：alterdiskgroupDATAadddisk'/dev/asm-diski'rebalancepower10;
