[CentOS] GPT Partitions >2.2T with Centos 5.5

Wed Jul 14 09:34:53 UTC 2010
Eero Volotinen <eero.volotinen at iki.fi>

2010/7/14 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?

I think ext3 is a bit slow on so big LUNS, try xfs or similar?