On Thu, May 28, 2020 at 03:00:43PM +0200, Harald Dunkel wrote: > Hi folks, > > Finding a good alignment appears to be a pretty complex task, esp. > for some RAID devices, so I wonder if this could be better supported > in parted? The current > > [bzzzzzzzz] The resulting partition is not properly aligned for best > performance. > > for all 2**n is *more* than annoying. For my lsi RAID I had to use > > Number Start End Size File system Name Flags > 1 1536s 46880782847s 46880781312s export > > following the guidelines on [1]. > > Obviously the align-check option has some deeper knowledge about > a good alignment, but it doesn't tell. :-(
Yeah, it's complicated :) But if you use the latest parted it will tell you more if you try to create a mis-aligned partition: Start? 8s End? 100% Warning: You requested a partition from 4096B to 1074MB (sectors 8..2097151). The closest location we can manage is 17.4kB to 1074MB (sectors 34..2097118). Is this still acceptable to you? Yes/No? y Warning: The resulting partition is not properly aligned for best performance: 34s % 2048s != 0s Ignore/Cancel? This means that it needs to be multiples of 2048 sectors to be aligned (this example is just an example with a disk image). Brian -- Brian C. Lane (PST8PDT) - weldr.io - lorax - parted - pykickstart
