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Subject: |
automatic alignment |
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Date: |
Thu, 28 May 2020 15:00:43 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 |
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. :-(
Regards
Harri
[1]
https://bdoga.com/how-to-fix-warning-device-is-not-properly-aligned-with-parted/
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--- Begin Message ---
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Subject: |
Re: bug#41577: automatic alignment |
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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
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
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