Re: GPT and SSDs
Hi.
On Mon, May 19, 2014 at 12:48:00AM -0400, Gary Dale wrote:
> This led me into partitioning. I thought that GPT pretty much gave
> you proper partition alignment, but now I think I was mistaken on
> that point. gdisk shows my first partition starting at 34, with the
> fdisk info showing 255 heads, 63 sectors/track. That doesn't come
> close to 4k alignment.
EFI label requires 34*512 disk sectors, so first partition starting on
34 sector is not unusual.
> Anyway, my gdisk data is:
> Disk /dev/sda: 234441648 sectors, 111.8 GiB
> Logical sector size: 512 bytes
This. Note that your disk's logical sector is 512 bytes.
> Before I haul out sysrescuecd and move my partitions around, I
> thought I'd ask for suggestions. Should I move the filesystem to
> something that is a multiple of 8, do something else, or look
> elsewhere for a solution to my problem?
Aligning disk against 4096 sector would be needed if your disk had 4096
physical sector (or 4096 logical one). This does not seem to be the
case, although you can check disk sector sizes with:
cat /sys/block/sda/queue/logical_block_size
cat /sys/block/sda/queue/physical_block_size
If both of those return 512 - you have nothing to worry about.
If either of them returns 4096 - you'll need to align your partitions.
Reco
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