ASM question for Diskgroup not complete

Question

Hi guys
Currently i am trying to solve a problem that is created by me in order for me to handle a real scenario. For example, there are three failgroups and each failgroup has 3 disks in window environment(VMWARE).
Diskgroup DATA
Failgroup 1: A, B and C
failgroup 2: D, E and F
failgroup 3: G, H, I
When i removed drive I (simulate a hard disk failure), the DATA diskgroup would not mount. If i tried to mount the diskgroup DATA, i would receive an error message like "DISKgroup not complete, ASM disk 6 and 4 missing". If i added a new disk for example T, i would receive an error message such as "diskgroup DATA does not exist or is not mounted". But if i added the disk I back, i would able to mount the DISKGROUP. Can anyone tell me how i can deal with this kind of situation without adding back the old disk I ?

Answer 1

Hi
I am not too sure about how ASM is able to handle disk failure
For example in ASM confiiguration :
Diskgroup DATA (Normal redundance) consists of 3 Failgroups:
Failgroup 1: A, B and C
failgroup 2: D, E and F
failgroup 3: G, H, I
Now lets assume Disk I fails. For ASM configuration, Data will be rebalanced within the Failgroup 3 to keep up normal redundancy. By right, the database is still online and is able to handle users.
But for my case:
When i removed drive I (simulate a hard disk failure) and start up the instance, the diskgroup would not mount. If i tried to mount the diskgroup DATA, i would receive an error message like "DISKgroup not complete, ASM disk 1 missing". ---> At this point, I thought ASM should able to handle disk failure and the diskgroup should be able to handle missing disk.
But if i added the original disk I back and start the vmware, i would able to mount the DISKGROUP. I was trying to make sure ASM configuration can handle disk failure.
How can i be too sure that ASM instance is able to handle disk failure if DISK I fails --->