项目场景：

部署Oracle11gRAC grid的安装

问题描述：

提示：这里描述项目中遇到的问题：

例如：数据传输过程中数据不时出现丢失的情况，偶尔会丢失一部分数据

APP 中接收数据代码：

@Override
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
User ignored Prerequisites during installation
Installing Trace File Analyzer
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'jkkdb2'
CRS-2676: Start of 'ora.cssdmonitor' on 'jkkdb2' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'jkkdb2'
CRS-2672: Attempting to start 'ora.diskmon' on 'jkkdb2'
CRS-2676: Start of 'ora.diskmon' on 'jkkdb2' succeeded
CRS-2676: Start of 'ora.cssd' on 'jkkdb2' succeeded

Disk Group crs creation failed with the following message:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/crs' matches no disks

 </font>



# 原因分析：

提示：多半是第二个结点共享磁盘未挂载到系统上导致不能识别。可利用fdisk -l显示如下则未挂载

```c
Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdc: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdd: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

解决方案：

vi /etc/udev/rules.d/99-oracle-asmdevices.rules

KERNEL==“sdb1”, NAME=“dbdata”, OWNER=“grid”, GROUP=“asmadmin”, MODE=“0660”

KERNEL==“sdc1”, NAME=“ogg”, OWNER=“grid”, GROUP=“asmadmin”, MODE=“0660”

KERNEL==“sdd1”, NAME=“crs”, OWNER=“grid”, GROUP=“asmadmin”, MODE=“0660”

udevadm control –reload-rules

start_udev