ASM raw disk creation

[root@suthakar asmdsk]# dd if=/dev/zero of=/asmdisk/disk1 bs=1024k count=1000 1000+0 records in                                                           1000+0 records in                                                           1000+0 records out                                                          1048576000 bytes (1.0 GB) copied, 6.0365 s, 174 MB/s  dd if=/dev/zero of=/asmdisk/disk2 bs=1024k count=1000 1000+0 records in                                                            1000+0 records out                                                           1048576000 bytes (1.0 GB) copied, 1.02826 s, 1.0 GB/s           dd if=/dev/zero of=/asmdisk/disk3 bs=1024k count=1000 1000+0 records in                                                            1000+0 records out                                                           1048576000 bytes (1.0 GB) copied, 1.03051 s, 1.0 GB/s dd if=/dev/zero of=/asmdisk/disk4 bs=1024k count=1000 1000+0 records in                                                            1000+0 records out                                                           1048576000 bytes (1.0 GB) copied, 1.0228 s, 1.0 GB/s --- [root@suthakar asmdsk]#  /sbin/losetup /dev/loop1 /asmdisk/disk1             [root@suthakar asmdsk]#  /sbin/losetup /dev/loop2 /asmdisk/disk2             [root@suthakar asmdsk]#  /sbin/losetup /dev/loop3 /asmdisk/disk3             [root@suthakar asmdsk]#  /sbin/losetup /dev/loop4 /asmdisk/disk4 raw /dev/raw/raw1 /dev/loop1 /dev/raw/raw1:  bound to major 7, minor 1 raw /dev/raw/raw2 /dev/loop2 /dev/raw/raw2:  bound to major 7, minor 2 raw /dev/raw/raw3 /dev/loop3 /dev/raw/raw3:  bound to major 7, minor 3 raw /dev/raw/raw4 /dev/loop4 /dev/raw/raw4:  bound to major 7, minor 4 [root@suthakar raw]# ls -ltr total 0 crw-rw----. 1 root disk 162, 0 Nov 15 14:37 rawctl crw-rw----. 1 root disk 162, 1 Nov 15 15:03 raw1 crw-rw----. 1 root disk 162, 2 Nov 15 15:03 raw2 crw-rw----. 1 root disk 162, 3 Nov 15 15:04 raw3 crw-rw----. 1 root disk 162, 4 Nov 15 15:04 raw4 [root@suthakar raw]# chown -R oracle:oinstall * [root@suthakar raw]# pwd /dev/raw [root@suthakar raw]# ls -ltr total 0 crw-rw----. 1 oracle oinstall 162, 0 Nov 15 14:37 rawctl crw-rw----. 1 oracle oinstall 162, 1 Nov 15 15:03 raw1 crw-rw----. 1 oracle oinstall 162, 2 Nov 15 15:03 raw2 crw-rw----. 1 oracle oinstall 162, 3 Nov 15 15:04 raw3 crw-rw----. 1 oracle oinstall 162, 4 Nov 15 15:04 raw4