ASM Diskgroup Creation Failed with "IBM AIX RISC system/6000: 6:no such device o

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　　In this Document
Symptoms
Cause
Solution
References

Applies to:
Oracle Server - Enterprise Edition - Version: 10.2.0.1 and later [Release: 10.2 and later ]
IBM AIX on POWER Systems (64-bit)
Symptoms
When attempting to create an ASM(Automated Storage Management) Diskgroup,
the following error occurs.
IBM AIX RISC system/6000: 6:no such device or address
Additional information:-1
Additional information:655360


In the ASM Diskgroup Creation page of DBCA, below message displayed after selecting the disk, but actually the ASM disk size is 2TB:
Size of New Disks Selected: 0 MB

STEPS
-----------------------
The issue can be reproduced at will with the following steps:
1. Create ASM diskgroup:
SQL>create diskgroup DATA External REDUNDANCY DISK '/dev/rhdisk2'
2. Error reported.

Cause
The cause is 2 terabyte is the maximum storage for each ASM disk (the unpublished Bug 6453944 allowed larger sizes, but that led to problems).
The following note provides additional information about this issue which can be hit with other messages:
ORA-15196 WITH ASM DISKS LARGER THAN 2TB (Doc ID 736891.1)
Solution
To resolve the issue, please contact your Storage Vendor and recreate your disk under 2TB.
References
NOTE:370921.1 - ASM - Scalability and Limits
NOTE:736891.1 - ORA-15196 WITH ASM DISKS LARGER THAN 2TB