While optimizing storage for a new LVM setup on a database server, you must ensure that the first physical extent on the fresh device /dev/sdd starts on a 4 MiB boundary to match the underlying RAID stripe size. Which pvcreate command accomplishes this requirement?
The pvcreate option that controls where the data area (and therefore the first physical extent) begins is --dataalignment. Specifying "--dataalignment 4M" forces pvcreate to align the start of the data area on a multiple of 4 MiB, satisfying the RAID-stripe requirement. The other options do not provide the needed alignment: --metadatasize only changes the size of the metadata area; --labelsector adjusts the sector where the LVM label is written; and --metadatacopies sets how many metadata copies are stored (and the value 4 is outside the valid range of 0-2).
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