How to add ASM Disk to Disk Group that is shown as MEMBER?

Question

HI,
We have a Production Oracle RAC on HP-UX. We have Two Disk Groups one for Arcive (ARC_DISK) and other for Database(DATA_DISK).
Today I wanted to add another 200 GB of Disk Space to the DATA_DISK Group.
I opened DBCA and could not find the new disk in the 'Show Candidates' option. But after the Unix admin changed the ownership and permission of the Disk, it was shown in 'Show Candidates' option. I selected this Disk and continued but got an error later as we didnt change the ownership and permission from the 2nd Unix server. After doing this, , when I open DBCA to add disk, nothing is shown in 'Show Candidates' option but when we click on 'Show All', the new disk is listed as MEMBER (header status) but not allocated to any Disk Group.
I would like to know how to allocate this Disk (which is already shown as MEMBER) to the DATA_DISK - ASM diskgroup. This is a production database system.
Rgds,
Thiru

Answer 1

user1983888 wrote:
Hi,
Due to huge difference in Disk Size which I am trying to add to the existing Disk Group which has 1024 GB of Disk, would it be a better idea to create a new Disk Group with 200g GB Disk? Will this command work as the header_status is already MEMBER?
SQL>CREATE DISKGROUP DATA_DISK1
EXTERNAL REDUNDANCY
DISK 'disk path';
Thanks.Yes, you can create new diskgroup (DATA_DISK1). Just make sure all datafile in DATA_DISK autoextend off, then create all your new datafile to the new diskgroup DATA_DISK1. The command will not work as the header_status is MEMBER. You'll receive ORA-15018 & ORA-15033 error. As I mentioned before, you need to use FORCE option or format the disk using dd* command before perform above command.
1st Option : (Format the raw disk using dd command creating new diskgroup. Header_status MEMBER -> CANDIDATE). E.g.
1. dd if=/dev/zero of=/dev/rdsk/c2t1d0 bs=8192 count=1000 //any rac nodes
2. # chown oracle:oinstall /dev/rdsk/c2t1d0 //perform on both node. This apply if using LVM or direct access to raw
3. SQL> create diskgroup data_disk1 external redundancy disk '/dev/rdsk/c2t1d0'; //any RAC node in ASM instance
4. SQL> alter diskgroup data_disk1 mount; //try to mount on the other node
2nd Option : (Using FORCE option when creating the new diskgroup. Header_Status = MEMBER)
1. # chown oracle:oinstall /dev/rdsk/c2t1d0 //perform on both node. This apply if using LVM or direct access to raw
2. SQL> create diskgroup data_disk1 external redundancy disk '/dev/rdsk/c2t1d0' force; //any RAC node in ASM instance
3. SQL> alter diskgroup data_disk1 mount; //try to mount on the other node
Just be careful when using FORCE option or DD command. If you perform this operation on existing ASM disk groups disk, it may destroy existing disk groups.