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List:       dragonfly-bugs
Subject:    [DragonFlyBSD - Bug #2830] gpt(8) doesn't align partitions to 1MB blocks
From:       bugtracker-admin () leaf ! dragonflybsd ! org
Date:       2015-06-30 20:41:05
Message-ID: redmine.journal-12687.20150630204105.e778804d714508a9 () leaf ! dragonflybsd ! org
[Download RAW message or body]

Issue #2830 has been updated by ftigeot.

Related to Bug #2674: GPT Support added

----------------------------------------
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: 
----------------------------------------
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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