RHEL 7.2使用EMC Powerpath扩容2T磁盘空间，需要添加至以用12C RAC for ASM系统中。下面是具体步骤，主机人员告知扩容别名为data_center_16、data_center_17
1：Linux 7 系统下添加映射存储LUN(无需重启)
1>查看机器HBA卡信息--两个节点机器都得root用户执行
#ls /sys/class/fc_host
host0-10
2>通过修改文件“scan”权限，让系统重新扫描新的硬件设备
echo '- - -' > /sys/class/scsi_host/host0/scan
echo '- - -' > /sys/class/scsi_host/host1/scan
echo '- - -' > /sys/class/scsi_host/host2/scan
echo '- - -' > /sys/class/scsi_host/host3/scan
echo '- - -' > /sys/class/scsi_host/host4/scan
echo '- - -' > /sys/class/scsi_host/host5/scan
echo '- - -' > /sys/class/scsi_host/host6/scan
echo '- - -' > /sys/class/scsi_host/host7/scan
echo '- - -' > /sys/class/scsi_host/host8/scan
echo '- - -' > /sys/class/scsi_host/host9/scan
echo '- - -' > /sys/class/scsi_host/host10/scan
3>查询新识别出的来设备，两个节点机器都得执行root用户
#powermt display dev=all
#ls -al /dev/emcpower*
#powermt display
#powermt config
#powermt save
4>查询新增的扩容盘为data_center_16、data_center_17
Pseudo name=emcpowert
VNX ID=CKM00141100044 [data_center]
Logical device ID=60060160F7303500ACF6E88706A1E811 [data_center_16]
state=alive; policy=CLAROpt; queued-IOs=0
Owner: default=SP B, current=SP B Array failover mode: 4
=====================================
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
HW Path I/O Paths Interf. Mode State Q-IOs Errors
=====================================
9 lpfc sdcx SP B0 active alive 0 0
9 lpfc sdcv SP A1 active alive 0 0
1 lpfc sdct SP A0 active alive 0 0
1 lpfc sdcr SP B1 active alive 0 0
Pseudo name=emcpoweru
VNX ID=CKM00141100044 [data_center]
Logical device ID=60060160F7303500ADF6E88706A1E811 [data_center_17]
state=alive; policy=CLAROpt; queued-IOs=0
Owner: default=SP B, current=SP B Array failover mode: 4
--------------- Host --------------- - Stor - -- I/O Path -- -- Stats ---
HW Path I/O Paths Interf. Mode State Q-IOs Errors
=====================================
9 lpfc sdcy SP B0 active alive 0 0
9 lpfc sdcw SP A1 active alive 0 0
1 lpfc sdcu SP A0 active alive 0 0
1 lpfc sdcs SP B1 active alive 0 0
并且查看有关系统信息是否有emcpowert、emcpoweru此次扩容盘别名
cat /proc/partitions | awk {'print $4'} |grep emcpower|sort
5> 执行root下脚本asm_udev_ol7.sh
[root@dwdb1 ~]# more asm_udev_ol7.sh
#!/bin/bash
for i in $(cat /proc/partitions | awk {'print $4'} |grep emcpower|sort);
do
echo "ACTION==\"add|change\", KERNEL==\"emcpower*\", ENV{DEVTYPE}==\"disk\",SUBSYSTEM==\"block\", PROGRAM==\"
/usr/lib/udev/scsi_id -g -u -d --whitelisted --replace-whitespace --device=\$devnode\", RESULT==\"/usr/lib/u<br/>dev/scsi_id -g -u -d --whitelisted --replace-whitespace --device=/dev/$i\",RUN+=\"/bin/sh -c 'mknod /dev/asm
-$i b \$major \$minor; chown grid:asmadmin /dev/asm-$i; chmod 0660 /dev/asm-$i'\"" >> /etc/udev/rules.d/
99-Oracle-asmdevices.rules_bak
done
6>生成的/etc/udev/rules.d/99-oracle-asmdevices.rules_bak中取出（360060160f7303500acf6e88706a1）
ACTION=="add|change", KERNEL=="emcpower", ENV{DEVTYPE}=="disk",SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/s
csi_id -g -u -d --whitelisted --replace-whitespace --device=$devnode", RESULT=="360060160f7303500acf6e88706a1
e811",RUN+="/bin/sh -c 'mknod /dev/asm-emcpowert b $major $minor; chown grid:asmadmin /dev/asm-emcpowert; chm
od 0660 /dev/asm-emcpowert'"
ACTION=="add|change", KERNEL=="emcpower", ENV{DEVTYPE}=="disk",SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/s
csi_id -g -u -d --whitelisted --replace-whitespace --device=$devnode", RESULT=="360060160f7303500adf6e88706a1
e811",RUN+="/bin/sh -c 'mknod /dev/asm-emcpoweru b $major $minor; chown grid:asmadmin /dev/asm-emcpoweru; chm
od 0660 /dev/asm-emcpoweru'"
7>然后vi /etc/udev/rules.d/99-oracle-asmdevices.rules新增两条信息，将改好的文件，scp到节点二。
ACTION=="add|change", KERNEL=="emcpower", ENV{DEVTYPE}=="disk",SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/s
csi_id -g -u -d --whitelisted --replace-whitespace --device=$devnode", RESULT=="360060160f7303500acf6e88706a1
e811",RUN+="/bin/sh -c 'mknod /dev/asm-data15 b $major $minor; chown grid:asmadmin /dev/asm-data15; chmod 066
0 /dev/asm-data15'"
ACTION=="add|change", KERNEL=="emcpower", ENV{DEVTYPE}=="disk",SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/s
csi_id -g -u -d --whitelisted --replace-whitespace --device=$devnode", RESULT=="360060160f7303500adf6e88706a1
e811",RUN+="/bin/sh -c 'mknod /dev/asm-data16 b $major $minor; chown grid:asmadmin /dev/asm-data16; chmod 066
0 /dev/asm-data16'"