Thank gnoboot,because i use chinese language,i not sure express so clear. i'm not use iscsi lun , i use PVSCSI in VM and use SATA disk in my old lenovo pc (intel chip ,motherboard specific model is not clear). i create the storage space (in console is volume),then delete it ,the system is not response. i power off the system in web console,the system did't power off. I type shutdown -h now in console ,system did't power off yet. I only pull out the power wire ,and restart the system ,then i can delete the volume. bye the way ,in this happen,i type 'lvdisplay' in console,the command has not show,and hang in there. I check the log file ,seem say can't lock the volume. I test alpha8 to alpha 10 , It's same. Thank!