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A quick thought about SSDs

my slow 160tb system disk. Slow but still SATA II

After the break some quick screenshots of HDD benchmarks. -Look at the speed on the SSD šŸ˜‰

Also, can you believe Samsung 256GB SSD for underĀ Ā£60? Get me one of those :)

“You use SSD already dont you ____? Whats it like compared to SATA II?”

This question just came up on facebook, and whilst not addressed to me, I couldn’t help but stick my two pennath in.

SATA II is the drive interface but your spinning disk is (almost certainly) not that fast. The lack of spinning and physical seeking on an SSD (last graph) makes finding files and fragments a breeze, so _much_ faster access and sustained data pumping through the SATA interface :)

I useĀ palimpsest under Gentoo. more details if anyone is vaguely interested šŸ˜‰

my slow 160tb system disk. Slow but still SATA II

my slow 160tb system disk. Slow but still SATA II

 

Single 1tb drive (these make up the RAID)

Single 1tb drive (these make up the RAID)

 

Here's a raid5 array made up of 4 of those 1tb disks -more heads, more speed.

Here’s a raid5 array made up of 4 of those 1tb disks -more heads, more speed.

 

And here's the SSD. Solid read performance and look at those seek times :)

And here’s the SSD. Solid read performance and look at those seek times :)

 

So what’s the takeaway?

RAID with 4 disks predictably gives you better throughput than 1, but not _that_ much more.

The really amazing thing is the seek time for the SSD. It’s never higher than 0.3ms compared to our spinning disk best of (maybe) 10ms. Orders of magnitude difference. :)

oh, and theĀ 250GB less thanĀ Ā£60 Samsung 840 Pro Series MZ-7PD256Ā that set it all off -feel free to buy me one (though they should be nearer Ā£200, so it might well be a scam)Ā šŸ˜‰

Categories: HardWare, Linux Tags: , ,
  1. Scott
    April 28th, 2013 at 19:11 | #1

    Good review. There’s clearly a benefit, and at the more afordable price it looks good.

    Personally I would use a SSD drive for video rendering /scratch-disk purposes, and a larger drive for archiving since it’s still to expensive to get above the 1TB level. Though to be honest I’m nit picking.

  2. April 28th, 2013 at 19:36 | #2

    That’s exactly the idea. Big ‘slower’ drives for archive and SSDs for working (and if you’re lucky,) system on. I have all my VMs sat on the SSD and virtual windows performs much better than the real deal.

    Just be careful using them as scratch drives. SSDs have a very finite amount of writes, so you do have the possibility of killing them (relatively) quickly.

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