Last updated on OCTOBER 31, 2016
Applies to:
Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.3 [Release 11.1 to 11.2]Information in this document applies to any platform.
Symptoms
You are on 11.2.0.3 or have the fix for the same issue on 11.2.0.2 as described in MOS Doc ID 1306574.1
Still, you are seeing that the disks of the dismounted diskgroup are held by processes.
This is not allowing you to copy the VGs of the dismounted diskgroup
In the ASM alert.log you might see the followings
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 5: Input/output error
Additional information: -1
Additional information: 4096
WARNING: Read Failed. group:0 disk:5 AU:0 offset:0 size:4096
and in the OS logs
May 16 12:59:12 myoda1 kernel: Buffer I/O error on device dm-35, logical block 8
Cause
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