from the OS side everything is fine
sg_readcap goes directly to device using pass through. So it confirms that you have LUN with correct size mapped, but still OS may cache old size. In my experience such changes really require deleting old device...
Can you see real capacity using sg_readcap?
# sg_readcap /dev/sdX
You can try deleting SCSI device on Linux and rescanning.
Check for SCSI host adapter number:
# lsscsi
...
[0:1:2:0] disk LSILOGIC Logical Volume 3000 /dev/sda
Here the first ...
Somehow I miss one step - how /etc/oratab is updated in case of host failover.
You want to start only databases entered in /etc/oratab. In normal case half of your databases are on host1, half of your databases are on host2. Host1 fails. VCS takes ov...