[bulug] Re: SSDs and partition alignment
- From: Bill Ricker <bill.n1vux@xxxxxxxxx>
- To: bulug-list@xxxxxxxxxxxxx
- Date: Mon, 23 Aug 2010 08:42:44 -0400
j
On 8/23/10, Jimmy C. Chau <chaujc@xxxxxxxxx> wrote:
> My old laptop's dying, so I got myself a ThinkPad X301, which happens
> to have a SSD. I just finished partitioning my SSD, when I stumbled
> upon some articles about aligning partitions and file-systems against
> the erase boundaries of the SSD:
>
> *
> http://thunk.org/tytso/blog/2009/02/20/aligning-filesystems-to-an-ssds-erase-block-size/
> * http://www.nuclex.org/blog/personal/80-aligning-an-ssd-on-linux%22
>
> The first article is supposedly written by a file-system dev, so I
> assume he knows what he's talking about, but reading his article left me
> confused about how to align partitions. E.g., where does he got the 224
> heads and the 56 sectors/track? I'm curious about how he got these
> numbers because I'm wondering if I'll need different settings for my SSD
> (Toshiba thns128gg4baaa-n), which is different from the one he uses.
>
> Anyone know how to figure out the erase block size of a SSD? I can find
> suggestions for Intel and OCZ SSDs, but none for Toshiba ones.
>
> Do the head and the sector/track numbers have any other effect (other
> than partition alignment)? What's the criteria for selecting these
> numbers?
>
> I'll keep searching for answers myself (and if anyone shows interest,
> I'll reply with what I learned), but some expert advice will probably
> make life a lot easier and would definitely be appreciated.
Interesting. I put an SSD in an accident prone laptop, and am thinking
about adding a swap partition, previously unadvised on SSD but
apparently ok with the new block aliasing, so this is timely.
--
Bill
n1vux@xxxxxxxx bill.n1vux@xxxxxxxxx
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