Oracle Database Discussions

I create diskgroup and mount,it error
can't mount because disk some problem so

I use dd

dd if=/dev/zero of=/dev/emcpowere1 bs=1024 count=1000

but I struck have problem
when i stop asm and then i started again , it hang

when i check trackfile i found


Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
ORACLE_HOME = /oracle/product/10.2.0/db
System name: Linux
Node name: npmdb2
Release: 2.4.21-37.EL
Version: #1 SMP Wed Sep 7 13:32:18 EDT 2005
Machine: x86_64
Instance name: +ASM2
Redo thread mounted by this instance: 0 <none>
Oracle process number: 13
Unix process pid: 14688, image: oracle@npmdb2 (RBAL)

*** SERVICE NAME:() 2006-03-17 21:55:56.499
*** SESSION ID:(59.1) 2006-03-17 21:55:56.499
kfgbRegister: registering group 1/0x1D3AEE34 (DGRP0)
kfgbDoorBellArm: value block read: 00000000
kfgbBind: binding kfgpn for group 1/0x1D3AEE34 (DGRP0)
kfgbRecoverCod: queued COD recovery for group 1/0x1d3aee34 (DGRP0)
kfgbPeelWaitCIC: ignored, not rebalancing gn=1
kfgbDoorBellArm: value block read: 00000000
WARNING: offlining disk 0.4042923716 (VOL0) with mask 0x3
NOTE: PST update: grp = 1, dsk = 0, mode = 0x6
ORA-15130: diskgroup "DGRP0" is being dismounted
ORA-15066: offlining disk "VOL0" may result in a data loss
kfgbUnbind: unbinding group 1/0x1d3aee34 (DGRP0)
*** 2006-03-17 21:56:00.933
kfgbUnregister: unregistering group 1/0x1d3aee34 (DGRP0)
*** 2006-03-17 21:56:16.638
kfgbPeelWaitCIC: ignored, not mounting gn=1
kfgbPeelWaitCIC: ignored, not mounting gn=2
kfgbRefreshCIC: ignored, not mounting gn=1



please help me for clean disks