[Novalug] Disk Partition Misalignment

greg pryzby greg@pryzby.org
Sat Mar 9 15:00:05 EST 2013


http://www.sitepoint.com/ubuntu-12-04-lts-precise-pangolin-using-gparted-to-partition-a-hard-disk/

gparted
mktable gpt
I (ignore)
Create a new partition and "Align to" pick MiB vs Cylinder

see if that helps


On Sat, Mar 9, 2013 at 2:37 PM, Roger W. Broseus <rogerb@bronord.com> wrote:

> How do I fix the following, including deleting a partition table and
> partitioning in a manner that doesn't cause problems?
>
> This is the issue that I raised at today's meeting. The disk was
> partitioned
> both with gparted and the partitioner that is embedded in Xubuntu 12.04.2
> installer (maybe they are the same under the hood?). Diagnostics below came
> from "Disk Utility."
>
> So, how do I delete the partition table so I can create a new one, and,
> partition properly to avoid misalignment?
>
> I created an msdos partition table. I understand that "gpt" (GUID Partition
> Table, tinyurl.com/ytkggm) may be better?
>
> The disk is a 2.5" HGST 1 TB 7200 rpm ATA
> Partitioning: Master Boot Record
>
> Here's what I see:
>
> sdc1, 524 GB ext4
> WARNING: The partition is misaligned by 512 bytes. This may result in very
> poor performance. Repartitioning is suggested.
>
> sdc2, 79 GB ext4
> misalignment: 1536 bytes
>
> /swap 8GB is okay
>
> Next is an extended partition, sdc4
> misalignment: 1024 bytes
>
> sdc5 25 GB fat 32, okay
>
> 364 GB free
>
> I run the self-tests built into Disk Utility and see no errors. SMART Data
> says the disk is healthy.
>
> /Roger
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-- 
greg pryzby                              greg at pryzby dot org
http://www.linkedin.com/in/gpryzby

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