[CentOS] GPT Partitions >2.2T with Centos 5.5

Wed Jul 14 09:30:07 UTC 2010
Jens Neu <jens.neu at biotronik.com>

Dear all,

unfortunately I observe drastic drops in read-  performance when I connect 
LUNs >2.2T to our Centos 5.5 Servers. I suspect issues with the GUID 
Partition Table, since it happens reproducibly only on the LUNs >2.2T and 
goes back to normal performance when using a LUN <2T with "normal", Legacy 
MBR partitions.
All machines are CentOS 5.5 (and RHEL 5.5) on IBM Blades LS21/LS41, all 
LUNs via Brocade 4G FC Switches from a SUN 7310 Unified Storage, EXT3 
filesystems with standard settings.

Any hints?


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