[Server-devel] Powering a hard drive?

[Anish Mangal]

Oops, forgot to actually cc Richard.

Here's some more Google searching of SSD v/s HDD prices.

 Capacity HDD price SSD Price Price difference 64 GB $25 $50 $25 128
GB $33$100$67256 GB$40$200$160512 GB$55$430$375
If you can manage a server with a 128 GB drive, then SSD seems to be the
way to go. At 256 GB, it's even between the two when you consider other
factors like durability; perhaps HDD has a slight edge here.

Anything bigger than that, it makes the most sense to buy an HDD.

Best,
Anish



On Fri, Aug 16, 2013 at 5:35 PM, Anish Mangal <anish at sugarlabs.org> wrote:

> Hi,
>
> I have been trying to crunch some numbers and the results seem
> interesting. I don't claim the calculations to be correct, so if someone
> with more knowledge (than me or a quick google search) can reply, would be
> very useful.
>
> The average difference between power consumption of an SSD and a HDD is
> about 4W. [1][2]
>
> Now considering the environments we're gonna head into we're looking at
> typically 1-3 days of power backup for the server (lets average out at 2).
>
> That means, the battery backup needed is:
> 4 * 24 * 2 = 192 W-hr
>
> *That comes out to roughly $25-35 in battery costs* (again based on quick
> google searches for battery costs). *If you want a longer life from
> you're battery, you're looking at about $50-60 in battery costs.*
>
> Now if we're also giving solar backup, based on the calculator here
> [3] we're going to need about a 25-30W solar panel (for just those 4 extra
> watts). Again, google tells me that *such panels retail for about $65-80.*
> *
> *
> *So, on average we'll save $100-$130 on TCO (total cost of ownership), if
> we intend to provide an SSD as opposed to an HDD, considering the server
> runs 24x7 and 2 days of backup is needed.*
> *
> *
> On top of that, you're looking at less failures, a better operating
> temperature range, and more durability.
> *
> *
> Disclaimer: I don't claim to be an expert in this area (hence am cc'ing
> Richard Smith), but this is what some back of the envelope number crunching
> tells me.
>
> [1] http://www.storagereview.com/ssd_vs_hdd
> [2]
> http://forum.notebookreview.com/solid-state-drives-ssds-flash-storage/645232-ssd-vs-hdd-power-usage.html
> [3] http://www.batterystuff.com/kb/tools/solar-calculator.html,
>
>
> Best,
> Anish
>
>
>
>
> On Fri, Aug 16, 2013 at 4:55 PM, James Cameron <quozl at laptop.org> wrote:
>
>> On Fri, Aug 16, 2013 at 12:18:40PM -0500, David Farning wrote:
>> > However the cost of a SSD is significantly higher than a normal
>> > drive.
>>
>> What's the incremental cost of solar capture and storage for powering
>> a hard drive compared to an SSD?
>>
>> --
>> James Cameron
>> http://quozl.linux.org.au/
>> _______________________________________________
>> Server-devel mailing list
>> Server-devel at lists.laptop.org
>> http://lists.laptop.org/listinfo/server-devel
>>
>
>
>
> --
> Anish | anish at sugarlabs.org
>



-- 
Anish | anish at sugarlabs.org
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