解释：guest01代表需更改的虚机名，*.iso为需添加的iso
如果报错：virsh # attach-disk ICCS-PM /gfs/sysdisk/installdisk-pool/cn_win_srv_2003_r2_enterprise_with_sp2_vl_cd2.iso hdc --driver file --type cdrom --mode readonly
错误：Failed to attach disk
错误：internal error unsupported driver name 'file' for disk '/gfs/sysdisk/installdisk-pool/cn_win_srv_2003_r2_enterprise_with_sp2_vl_cd2.iso'
取消--driver file参数即可
Add CDROM:
#virsh
attach-disk guest01 /root/disc1.iso hdc --driver file --type cdrom
--mode readonly
Change CDROM:
attach-disk guest01 /root/disc2.iso hdc --driver file --type cdrom
--mode readonly
Remove CDROM:
attach-disk guest01 " " hdc --driver file --type cdrom
--mode readonly