Upgrade hwardware raid10 disks to bigger size?

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http://serverfault.com – I dont have extra server. Server is in IDC. I have centos 5 OS installed. with RAID bus controller: Adaptec AAC-RAID (rev 02) controller (Adaptec 4000SAS) 4 disks x 74gb sas 15k no LVM filesystem EXT3 how to migrate without pain? (HowTos)