10-12-2012
It's giving an input/output error, fdisk will likely fail as well and you should be able to pvcreate whole disks and LUNs without needing to partition them. pvcreate is just saying it can't write data which is 100% of the time because I/O to the disk fails (you can do a dd to/from it and you'll likely get an error there as well, for example). So the issue isn't with pvcreate, that's just reporting an underlying error.
Just from my experience, this is probably a SAN configuration issue (definitely not a RHEL issue), where the LUNs are presented to the RHEL system but something is preventing actual I/O with those LUNs from happening. I'd have the SAN guys check the zoning configuration to make sure everything is kosher there.
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