NetApp support has suggested us to align partitions to improve I/O performance, in short: starting sector must be divisible by 8. How can I move the starting point in a misaligned partition -in production, with ext3- under Linux?
A screenshot with a misaligned (start=63s) and aligned (start=64s) partition is available at:
(If anyone is interested in this topic, NetApp has a good document explaining performance issues in misaligned partitions, search for "tr-3747": Best Practices for File System Alignment in Virtual Environments.)
I have tried using parted with "resize + move" commands, but when moving the starting point I get this error:
(parted) resize Partition number? 1 Start? [64s]? End? [419425019s]? 419425018 (parted) move Partition number? 1 Start? 65 End? [419425019s]? 419425019 Error: Can't move a partition onto itself. Try using resize, perhaps?
Using fdisk's 'b' command in expert mode ('move beginning of data in a partition') works, but it doesn't move the file system.. thanks!!