ASM Disk Problem

Question

My diskgroup have three disks.
The first disk state is NORMAL,
but secondly and thirdly disk state is FORCING,not to use it.
How to change disk'state ?

Answer 1

I encountered a similar problem in the past. If you look in the reference manual
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10755/dynviews_1018.htm#sthref2985, V$ASM_DISK.STATE=FORCING is described as
FORCING - Disk is being removed from the disk group without attempting to offload its data. The data will be recovered from redundant copies, where possible.
Have you tried rebalancing the diskgroup? Before issuing the statement below make sure you have backups. The rebalance does not implicate data loss, it will only uniformly redistribute the data. Nevertheless it always wise to have a backup before doing this on a production database.
alter diskgroup <diskgroup_name> rebalance;
If the rebalance works properly the second and third disks should automatically be dropped and you can re-add them to the diskgroup.
If this does not work for you, please file an itar with Oracle Support as you may need to apply the most recent patchset and other patches.