cleaning all asm disks and headers and recreating diskgroup in solaris

Identify the disks for the diskgroup you are trying to format everything from

In my case i am cleanup data diskgroup and the raw devices are
/dev/rdsk/c0d3s0
/dev/rdsk/c0d4s0
..
..
...
..


So i am running the following command to cleanup disks



dd if=/dev/zero of=/dev/rdsk/c0d3s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d4s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d5s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d6s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d7s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d8s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d9s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d10s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d11s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d12s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d13s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d14s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d15s0 bs=1048576 count=50
dd if=/dev/zero of=/dev/rdsk/c0d16s0 bs=1048576 count=50



Recreating diskgroup in solaris

Login as root


# format

select disk

y
p
6
default
default
0
0
1
default
default
0
0

0
default
default
1

10920c/65532c (depending on disk)
label
y
q


After its done

View permissions using

ls -lhL /dev/rdsk/c0d*s0

grant permission to oracle user on the disk

chown oracle:dba /dev/rdsk/c0d3s0
chown oracle:dba /dev/rdsk/c0d4s0

chmod 660 /dev/rdsk/c0d3s0
chmod 660 /dev/rdsk/c0d4s0

Once you do this

you should be able to see diskgroup in asmca and proceed creating diskgroup

To improve rebalance speed

alter diskgroup data rebalance power 4;