SAMFS 5.2 I/O RAID 5 IO Alignment with EFI Labels
One of the most overlooked design decisions when setting up a new filesystem is correcting the RAID 5 stripe alignment when using EFI labels on the disk. The EFI label uses the first 32 sectors of the disk, immediately causing the strip to misalign.
For example, when using SAN disk, often you will select a segment size on the disk when creating the RAID group. For example: