work with direct I/O, as that normally requires sector alignment.
.TP
.BI blockalign \fR=\fPint[,int] "\fR,\fB ba" \fR=\fPint[,int]
-At what boundary to align random IO offsets. Defaults to the same as
-'blocksize' the minimum blocksize given. Minimum alignment is typically 512b
+At what boundary to align random IO offsets. Defaults to the same as 'blocksize'
+the minimum blocksize given. Minimum alignment is typically 512b
for using direct IO, though it usually depends on the hardware block size.
This option is mutually exclusive with using a random map for files, so it
will turn off that option.