ASM Filter Driver是一个可以取代 ASMLIB 和 udev 设置的新功能，它可以一举取代 ASMLIB 和手动设置 udev rules 文件的繁琐，并且最重要的是 I/O Filter 功能。所谓的I/O Filter功能可以拒绝所有无效的
ASM Filter Driver是一个可以取代 ASMLIB 和 udev 设置的新功能，它可以一举取代 ASMLIB 和手动设置 udev rules 文件的繁琐，并且最重要的是 I/O Filter 功能。所谓的I/O Filter功能可以拒绝所有无效的 I/O 请求，最主要的作用是防止意外覆写 ASM 磁盘的底层盘，在后面的测试中可以看到对于 root 用户的 dd 全盘清零这样的变态操作也都是可以过滤的。
1、查询集群状态
[root@odb02 ~]# crsctl check cluster -all
**************************************************************
odb02:
CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
**************************************************************
odb03:
CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online
CRS-4533: Event Manager is online
**************************************************************
2、查询集群模式
[root@odb02 ~]# crsctl get cluster mode status
Cluster is running in "flex" mode
从12c R2以后，默认的集群模式为flex。
3、查询当前的ASM磁盘以及发现路径
[root@odb02 ~]# Oracleasm listdisks | xargs oracleasm querydisk -p
Disk "DATA01" is a valid ASM disk
/dev/sdb1: LABEL="DATA01" TYPE="oracleasm"
Disk "FRA001" is a valid ASM disk
/dev/sdc1: LABEL="FRA001" TYPE="oracleasm"
[root@odb02 ~]# asmcmd dsget
parameter:/dev/oracleasm/disks/*
profile:/dev/oracleasm/disks/*
4、设置新的ASM磁盘发现路径
[grid@odb02 ~]$ asmcmd dsset '/dev/oracleasm/disks/*','AFD:*'
[grid@odb02 ~]$ asmcmd dsget
parameter:/dev/oracleasm/disks/*, AFD:*
profile:/dev/oracleasm/disks/*,AFD:*
5、检查 GI 环境中的节点
[grid@odb02 ~]$ olsnodes
odb02
odb03
6、RAC所有节点停止集群服务
[root@odb02 ~]# crsctl stop crs
[root@odb03 ~]# crsctl stop crs
7、RAC所有节点卸载ASMLIB软件
odb02
[root@odb02 ~]# systemctl disable oracleasm
Removed symlink /etc/systemd/system/multi-user.target.wants/oracleasm.service.
[root@odb02 ~]# oracleasm status
Checking if ASM is loaded: yes
Checking if /dev/oracleasm is mounted: yes
[root@odb02 ~]# oracleasm exit
Unmounting ASMlib driver filesystem: /dev/oracleasm
Unloading module "oracleasm": oracleasm
[root@odb02 ~]# ls -ltr /dev/oracleasm/
total 0
[root@odb02 ~]# yum -y remove oracleasm-support
odb03
[root@odb03 ~]# systemctl disable oracleasm
Removed symlink /etc/systemd/system/multi-user.target.wants/oracleasm.service.
[root@odb03 ~]# oracleasm status
Checking if ASM is loaded: yes
Checking if /dev/oracleasm is mounted: yes
[root@odb03 ~]# oracleasm exit
Unmounting ASMlib driver filesystem: /dev/oracleasm
Unloading module "oracleasm": oracleasm
[root@odb03 ~]# ls -ltr /dev/oracleasm/
total 0
[root@odb03 ~]# yum -y remove oracleasm-support
8、RAC所有节点停止acfsload服务
[root@odb02 ~]# lsmod|grep acfs
[root@odb02 ~]# acfsload stop
[root@odb02 ~]# lsmod|grep acfs
9、RAC所有节点配置AFD
AFD Configure，实际上这是一个解压程序包，安装，并加载 Driver 的过程，需要消耗一些时间。
[root@odb02 ~]# asmcmd afd_configure
ASMCMD-9523: command cannot be used when Oracle Clusterware stack is up
--如果遇到以上报错，先停止has，再执行一次。
[root@odb02 ~]# crsctl stop has
[root@odb02 ~]# asmcmd afd_configure
AFD-627: AFD distribution files found.
AFD-634: Removing previous AFD installation.
AFD-635: Previous AFD components successfully removed.
AFD-636: Installing requested AFD software.
AFD-637: Loading installed AFD drivers.
AFD-9321: Creating udev for AFD.
AFD-9323: Creating module dependencies - this may take some time.
AFD-9154: Loading 'oracleafd.ko' driver.
AFD-649: Verifying AFD devices.
AFD-9156: Detecting control device '/dev/oracleafd/admin'.
AFD-638: AFD installation correctness verified.
Modifying resource dependencies - this may take some time.
配置完成后，验证下状态：
[root@odb02 ~]# asmcmd afd_state
ASMCMD-9526: The AFD state is 'LOADED' and filtering is 'ENABLED' on host 'odb02'
[root@odb03 ~]# asmcmd afd_state
ASMCMD-9526: The AFD state is 'LOADED' and filtering is 'ENABLED' on host 'odb03'
--如果上述的状态为disabled，则使用下面的命令启用
[root@odb02 ~]# asmcmd afd_filter -e
另外，会生成一个/etc/oracleafd.conf文件，内容如下：
[root@odb02 ~]# cat /etc/oracleafd.conf
afd_diskstring='/dev/oracleasm/disks/*'
如果其他节点没有，就把这个文件复制一份过去，避免启动crs的时候出错。
10、迁移所有ASM磁盘
这个在一个节点操作，在其他的节点中，不再需要作label，而是直接scan即可，这跟使用 ASMLIB的操作非常相似。另外命令后面必须加migrate参数，才可以成功。
[root@odb02 ~]# asmcmd afd_label data01 /dev/sdb1 --migrate
[root@odb02 ~]# asmcmd afd_label fra001 /dev/sdc1 --migrate
[root@odb02 ~]# asmcmd afd_lsdsk
--------------------------------------------------------------------------------
Label Filtering Path
================================================================================
DATA01 ENABLED /dev/sdb1
FRA001 ENABLED /dev/sdc1
其他节点执行扫描操作：
[grid@odb03 ~]$ asmcmd afd_scan
[grid@odb03 ~]$ asmcmd afd_lsdsk
--------------------------------------------------------------------------------
Label Filtering Path
================================================================================
DATA01 ENABLED /dev/sdb1
FRA001 ENABLED /dev/sdc1
最后，更新/etc/oracleafd.conf的内容如下：
[root@odb02 ~]# cat /etc/oracleafd.conf
afd_diskstring='/dev/sd*
11、RAC所有节点启动acfsload
[root@odb02 ~]# acfsload start
ACFS-9391: Checking for existing ADVM/ACFS installation.
ACFS-9392: Validating ADVM/ACFS installation files for operating system.
ACFS-9393: Verifying ASM Administrator setup.
ACFS-9308: Loading installed ADVM/ACFS drivers.
ACFS-9327: Verifying ADVM/ACFS devices.
ACFS-9156: Detecting control device '/dev/asm/.asm_ctl_spec'.
ACFS-9156: Detecting control device '/dev/ofsctl'.
ACFS-9322: completed
12、RAC所有节点启动CRS
[root@odb02 ~]# crsctl start crs
[root@odb03 ~]# crsctl start crs
待所有服务启动后，检查下diskstring参数设置：
[grid@odb02 ~]$ asmcmd dsget
parameter:/dev/oracleasm/disks/*, AFD:*
profile:/dev/oracleasm/disks/*,AFD:*
[grid@odb02 ~]$ asmcmd dsset 'AFD:*'
[grid@odb02 ~]$ asmcmd dsget
parameter:AFD:*
profile:AFD:*
[grid@odb02 ~]$ asmcmd lsdsk
Path
AFD:DATA01
AFD:FRA001
最后通过SQLplus执行下面的SQL进行验证：
set linesize 300
col PATH for a20
set pages 20
col LIBRARY for a45
col NAME for a15
select inst_id,group_number grp_num,name,state,header_status header,mount_status mount,path, library
from gv$asm_disk order by inst_id,group_number,name;
参考文献：1、Oracle ASM Filter Driver (ASMFD)2、Migrating from ASMLIB to ASMFD
更多Oracle相关信息见Oracle 专题页面 https://www.558idc.com/topicnews.aspx?tid=12
