更换主机后，emc存储识别

oracle 19.9 rac      rhel 7
因主机性能不满足要求，更换新的服务器，存储通过emc克隆一份新的

先在新机器上划分3个10g的共享盘，安装GI、db软件，不建库

识别存储

[grid@db1-[+ASM1]-/home/grid]$ ls -l /dev/|grep -E 'emc|asm'|head
drwxr-xr-x    2 root root          100 Aug 11 17:14 asmdisk
crw-r--r--    1 root root      10,  55 Aug 11 17:14 emcpower
brw-rw----    1 grid asmadmin 120,   0 Aug 12 09:23 emcpowera
brw-rw----    1 root disk     120, 416 Aug 11 17:14 emcpoweraa
brw-rw----    1 root disk     120, 432 Aug 11 17:14 emcpowerab
brw-rw----    1 root disk     120, 448 Aug 11 17:14 emcpowerac
brw-rw----    1 root disk     120, 464 Aug 11 17:14 emcpowerad
brw-rw----    1 root disk     120, 480 Aug 11 17:14 emcpowerae
brw-rw----    1 root disk     120, 496 Aug 11 17:14 emcpoweraf
brw-rw----    1 root disk     120, 512 Aug 11 17:14 emcpowerag
[grid@db1-[+ASM1]-/home/grid]$
属主还是root，还未绑定，ocrdg三个新磁盘

[grid@db1-[+ASM1]-/home/grid]$ kfod disks=all
--------------------------------------------------------------------------------
 Disk Size Path User Group
================================================================================
   1: 10241 MB /dev/asmdisk/OCR01                       grid     asmadmin
   2: 10241 MB /dev/asmdisk/OCR02                       grid     asmadmin
   3: 10241 MB /dev/asmdisk/OCR03                       grid     asmadmin
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================

root:
export ORACLE_HOME=/oracle/app/19.3.0/grid
for i in `ls /dev/emcpow*`; do val=` $ORACLE_HOME/bin/kfed read de=$i|grep dskname|awk '{print $2}'`;echo $val $i `/usr/lib/udev/scsi_id -gud $i`; done|sort
识别出设备对应的asm磁盘组，然后进行绑定

for i in `cat /proc/partitions | awk {'print $4'} |grep emcpower`; do val=`/sbin/blockdev --getsize64 /dev/$i` ; val2=`expr $val / 1073741824`; echo "/dev/$i: $val2 `/usr/lib/udev/scsi_id -gud /dev/$i`" ; done

rm -fr /tmp/a.rules
for i in ` grep emcpower /proc/partitions|awk {'print $4'} ` ;
do
 echo "KERNEL==\"emcpower*\",SUBSYSTEM==\"block\", PROGRAM==\"/usr/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/\$name\", RESULT==\"`/usr/lib/udev/scsi_id -gud /dev/$i`\", SYMLINK+=\"asmdisk/DATA26\", OWNER=\"grid\", GROUP=\"asmadmin\", MODE=\"0660\" " >> /tmp/a.rules ;
done
cat /tmp/a.rules

确认无误后，将 a.rules中内容合并到现在的udev文件里

/sbin/udevadm control --reload-rules
/sbin/udevadm trigger --type=devices --action=change

grid：
sqlplus / as sysasm
alter diskgroup archdg mount;
alter diskgroup datadg mount;

确认磁盘组状态、大小正常
asmcmd lsdg

State Type Rebal  Sector  Logical_Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
MOUNTED  EXTERN  N         512             512   4096  1048576    759572   709834                0          709834              0             N  ARCHDG/
MOUNTED  EXTERN  N         512             512   4096  1048576   1450092   350074                0          350074              0             N  DATADG/
MOUNTED  NORMAL  N         512             512   4096  4194304     30720    29748            10240            9754              0             Y  OCRDG/

编辑一个initorcl1.ora文件，启动实例即可。