清空ASM 磁盘内容：
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdb1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 4.93575 seconds, 212 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdc1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.07477 seconds, 207 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdd1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.0718 seconds, 207 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdE1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 0.741614 seconds, 1.4 GB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sde1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.2767 seconds, 199 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdf1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.34942 seconds, 196 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdg1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.39827 seconds, 194 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdh1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.49504 seconds, 191 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdi1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.95308 seconds, 176 MB/s
[root@rac1 ~]# dd if=/dev/zero of=/dev/sdj1 bs=8192 count=128000
128000+0 records in
128000+0 records out
1048576000 bytes (1.0 GB) copied, 5.11809 seconds, 205 MB/s
