[Server-devel] Powering a hard drive?
We have just received confirmation that compulab won't be releasing a SATA connector with the utilite. ( http://utilite-computer.com/web/home ) Instread they will offer a mSATA connection. So far, they have not been willing to clarify if the change is due to heat, power, or marketing. As shipped the base utility will hit the all important sub $100 mark. However the cost of a SSD is significantly higher than a normal drive. Do any of the power experts have suggestions? Losing the 'all in one' form factor greatly reduces the value in my opinion -- David Farning Activity Central: http://www.activitycentral.com ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Powering a hard drive?
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@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Powering a hard drive?
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 qu...@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@lists.laptop.org http://lists.laptop.org/listinfo/server-devel -- Anish | an...@sugarlabs.org ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Powering a hard drive?
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 an...@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 qu...@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@lists.laptop.org http://lists.laptop.org/listinfo/server-devel -- Anish | an...@sugarlabs.org -- Anish | an...@sugarlabs.org ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
