1.可以在2台主机上通过scsimgr -p get_attr all_lun -a hw_path -a device_file -a wwid来查看wwn，wwn一致的为同一个盘，也可以通过它与存储划得每个lun对应起来
2.通过ioinit来修改，具体过程如下：

备份先：备份ioconfig及ioscan的输出

更改过程
# ioscan –funNCdisk

Class I H/W Path Driver S/W State H/W Type Description
===================================================================
...
disk 17 64000/0xfa00/0xb esdisk CLAIMED DEVICE HP EF0300FATFD
/dev/disk/disk17 /dev/rdisk/disk17
现在要将disk17改为disk28，因为我仅仅是要修改一个disk，所以就直接vi一个infile文件，如果disk比较多，ioscan加awk来做
#cat infile
64000/0xfa00/0xb disk 28
这里的64000/0xfa00/0xb是ioscan里面的disk17的H/W Path
# ioinit -f infile
# ioscan -funNCdisk
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
.....
disk 28 64000/0xfa00/0xb esdisk CLAIMED DEVICE HP EF0300FATFD
/dev/disk/disk17 /dev/disk/disk28 /dev/rdisk/disk17 /dev/rdisk/disk28
# rmsf /dev/disk/disk17
# rmsf /dev/rdisk/disk17

# ioscan -funNCdisk
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
...
disk 28 64000/0xfa00/0xb esdisk CLAIMED DEVICE HP EF0300FATFD
/dev/disk/disk28 /dev/rdisk/disk28

主机重启后disk instance number不会发生变化