Thursday, September 5, 2013

OS&Storage -- OS and Storage Alignment

Host file system need to be aligned with a Storage Lun, in order to achieve best performance.
This can be accomplished specifying the correct starting sector or logical block address (LBA) for the partition, and filesystem should be configured to use the same or multiple of the Storage block size..

On Linux , you can configure a partition and filesystem using fdisk (x option)

Alignment is important, and should be considered for Storage IO performance.Otherwise, you can end up with the following;

Misaligned filesystem and LUN:


It is almost equal -> doing 2 Storage IO for 1 OS IO..



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