Create ASM disks on Solarix X64 fails with ORA-15031

Question

I am trying to create a ASM disk group on SOLARIS x64 using a NETAPP LUN. Below are the disks which are configured
SQL> show parameter asm;
NAME TYPE VALUE
asm_diskgroups string DATA
asm_diskstring string /dev/rdsk/c2t9*
asm_power_limit integer 1
asm_preferred_read_failure_groups string
bash-3.00# ls -ltr /dev/rdsk/c2t9d0s7
lrwxrwxrwx 1 root root 80 May 22 16:27 /dev/rdsk/c2t9d0s7 -> ../../devices/iscsi/[email protected]%3Asn.157399130103EC,99:h,raw
bash-3.00# ls -ltr ../../devices/iscsi/[email protected]%3Asn.157399130103EC,99:h,raw
crw-r----- 1 oracle dba 32, 583 May 22 16:56 ../../devices/iscsi/[email protected]%3Asn.157399130103EC,99:h,raw
I get these errors when I try to create a disk group
SQL> create diskgroup DATA external redundancy disk '/dev/rdsk/c2t9d0s7';
create diskgroup DATA external redundancy disk '/dev/rdsk/c2t9d0s7'
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/rdsk/c2t9d0s7' matches no disks
ORA-15025: could not open disk '/dev/rdsk/c2t9d0s7'
ORA-15056: additional error message
Solaris-AMD64 Error: 13: Permission denied
Additional information: 42
Additional information: 198045856
Additional information: 198045848
Please help.

Answer 1

My guess is that you did not run fdisk and partition off the first 1M and ASM overwrote the VTOC rendering the device useless.
fdisk
create new partition
primary partition 1
start 2 end <last cylinder>
Then point your disk string to these partitions (<diskname>p1?)
Once this is done, I ALWAYS test to make sure the oracle AND grid user can read and write to this device from ALL nodes. I use the dd command to do this.
DO NOT DO THIS ON AN ALREADY CONFIGURED AND FUNCTIONING ASM DEVICE. Doing so will erase the device.
make a file in $HOME that contains one line:
cat <<EOF >> $HOME/x.x
this is a test
EOF
node1
dd if=$HOME/x.x of=<disk???p1> bs=20 count=1
node2
dd if=<disk???p1> of=$HOME/y.y bs=20 count=1 ##y.y should be the contents of node1:x.x
node1
dd if=/dev/zero of=<disk???p1> bs=8192 count=1000 ## erase the device for ASM usage.
Fix any read/write issues before proceeding.