一、概述

RAC数据库扩容存储空间，新挂载过来的盘没有识别到，通过fdisk -l命令没有看到。经查询需要重启或者扫描来看到新挂载的磁盘，今天分享一下具体的方法

环境：OEL 6.4 和 RAC 11.2.0.4

二、关键事项不要使用/dev/sdX 或 /dev/dm-XX 作为设备名称，因为此设备名称在重新启动后可能会更改使用WWID 识别设备全局标识符 (WWID) 可用于可靠地识别磁盘设备。WWID 是 SCSI 标准要求所有 SCSI 设备提供的持久的、独立于系统的 ID。三、显示系统上所有可用的 WWID

Shell script to display WWID on your system#!/bin/bash##Usage:  As root user run : ./check_wwid.sh #for FILE in `find /dev -name "sd*" | sort`   do     WWID=`scsi_id --whitelisted --replace-whitespace --device=$FILE `     echo $FILE " WWID:  "  $WWID   done$ sudo ./check_wwid.sh../dev/sdb   WWID:   1ATA_VBOX_HARDDISK_VB81c4f844-94203a15/dev/sdb1  WWID:   1ATA_VBOX_HARDDISK_VB81c4f844-94203a15/dev/sdc   WWID:   1ATA_VBOX_HARDDISK_VB2ed83c09-e66dbcfb/dev/sdc1  WWID:   1ATA_VBOX_HARDDISK_VB2ed83c09-e66dbcfb..--> Of course WWIDs for partitions and for the complete disk are identical 

# cat 99-oracle-asmdevices.rulesKERNEL=="sd*", SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", ENV{ID_SERIAL}=="14f504e46494c45523264556151442d5261336d2d566e4250", OWNER="grid", GROUP="asmadmin", MODE="0660"# ls -ls /dev/sdr0 brw-rw----. 1 grid asmadmin 65, 16 Mar 19 14:42 /dev/sdrReload and Restart the udev rules # udevadm control --reload-rules# start_udevStarting udev:                                             [  OK  ]Verify disk protections:# ls -ltr /dev/asm*brw-rw----. 1 grid asmadmin   8,  17 Mar 15 10:03 /dev/asmdisk1_udev_sdb1brw-rw----. 1 grid asmadmin   8,  33 Mar 15 10:03 /dev/asmdisk2_udev_sdc1Redistribute   99-oracle-asmdevices.rules file to all cluster nodes and restat udev echo system on these nodes# scp 99-oracle-asmdevices.rules grac42:/etc/udev/rules.d# scp 99-oracle-asmdevices.rules grac43:/etc/udev/rules.dOn each RAC node# udevadm control --reload-rules# start_udev# ls -ltr /dev/asm*brw-rw----. 1 grid asmadmin   8,  17 Mar 15 10:03 /dev/asmdisk1_udev_sdb1brw-rw----. 1 grid asmadmin   8,  33 Mar 15 10:03 /dev/asmdisk2_udev_sdc1

# cat 99-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----. 1 grid asmadmin 8, 17 Mar 19 13:53 /dev/asmdisk1_udev_sdb1brw-rw----. 1 grid asmadmin 8, 33 Mar 19 13:53 /dev/asmdisk1_udev_sdc1

select group_number,disk_number ,path from v$asm_disk;

alter diskgroup data2 add disk '/dev/asm-diski';ALTER DISKGROUP DATA2 REBALANCE POWER 10; 

select operation,est_minutes from v$asm_operation;

alter diskgroup DATA rebalance power 1;

alter diskgroup DATA add disk '/dev/asm-diski' rebalance power 10;

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