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bug#41577: automatic alignment

From: Brian C. Lane
Subject: bug#41577: automatic alignment
Date: Thu, 28 May 2020 16:57:32 -0700

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

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 C. Lane (PST8PDT) - weldr.io - lorax - parted - pykickstart

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