[DragonFlyBSD - Bug #2830] gpt(8) doesn't align partitions to 1MB blocks

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2830 has been updated by ftigeot.

Related to Bug #2674: GPT Support added

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Bug #2830: gpt(8) doesn't align partitions to 1MB blocks
http://bugs.dragonflybsd.org/issues/2830#change-12687

* Author: ftigeot
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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The GPT partition scheme management utility, gpt(8) doesn't manage partition alignment at all.

# gpt create /dev/da1
# gpt boot /dev/da1
# gpt show /dev/da1
      start       size  index  contents
          0          1      -  PMBR
          1          1      -  Pri GPT header
          2         32      -  Pri GPT table
         34    2097152      0  GPT part - DragonFly Label32

We can see the just created boot partition starts on the legacy sector 34 offset, 17KB from the start of the device.

This isn't divisible by the physical sector size of modern disk devices (4KB).
It isn't optimal with SSD either: they typically use 8KB or bigger erase blocks.

gpt(8) should behave in the same as disklabel64 and align partitions to 1MB boundaries.



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