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[DailyTech]EBay moving to SSD

post #1 of 16
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Quote:
HDD-based storage in a single year with the SSD-based storage and saw some impressive gains and improvements from the swap. The reduction in storage rack space between the old solution and the new SSD solution was 50%. The reduction on power use was 78% and in a large data center, the reduction in power use can mean huge savings on electric bills.
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post #2 of 16
Wow...that's a lot of SSDs

I don't think even a 78% reduction in power used by their storage would even come close to covering that cost. A set of HDDs in a server rack might use 100watts...150watts at most. Take that times how ever many servers they ran (which I assume is a very large amount) and you still don't really have a teribble amount of energy usage to subtract 78% from. Even assuming 24/7 operation. There are probably other electronics arrount eh Ebay company off that use more power then the storage.

If this was long term it would be a big deal, but all these SSDs will need to be replaced in a couple years. Well, this will be a good test of SSD life span if nothing else.
Edited by Vagrant Storm - 8/4/11 at 7:07am
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post #3 of 16
Even though the SSD's are expensive, they would surely make this back in regards to lowering the load of the air con, data base $/pm and the downright power saved on the storage itself
post #4 of 16
Umm, Why are they using MLC flash?
post #5 of 16
Quote:
Originally Posted by Vagrant Storm View Post
Wow...that's a lot of SSDs

I don't think even a 78% reduction in power used by their storage would even come close to covering that cost. A set of HDDs in a server rack might use 100watts...150watts at most. Take that times how ever many servers they ran (which I assume is a very large amount) and you still don't really have a teribble amount of energy usage to subtract 78% from. Even assuming 24/7 operation. There are probably other electronics arrount eh Ebay company off that use more power then the storage.

If this was long term it would be a big deal, but all these SSDs will need to be replaced in a couple years. Well, this will be a good test of SSD life span if nothing else.
A rack is 44U and 24 3.5" HDDs fit into 4U. A single rack full off HDDs would probably consume around 3000w. In addition, you have to consider efficency, backbone, and HVAC costs.... so that would be another 3500-5000w. So they are looking at around $4000-5000 a year in power costs per HDD rack.

Besides, the power savings is just a side benefit. The main reason for the upgrade is the database I/O gain of 100x fold.

Quote:
Originally Posted by AMDPhenomX4 View Post
Umm, Why are they using MLC flash?
The usage is closer to "write once, read many". A new auction only requires one write request and maybe a few more for updates by the user. However, the auction information is read hundred/thousands of times. You are looking at something like a 1:100 to 1:1000 write/read ratio so MLC makes sense to reduce cost.
Edited by DuckieHo - 8/4/11 at 7:26am
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post #6 of 16
Quote:
Originally Posted by AMDPhenomX4 View Post
Umm, Why are they using MLC flash?
It's cheaper, I guess. Here's the Wikipedia page for anybody who is interested.

And what Duckie said.
post #7 of 16
Quote:
Originally Posted by DuckieHo View Post
A rack is 44U and 24 3.5" HDDs fit into 4U. A single rack full off HDDs would probably consume around 3000w. In addition, you have to consider efficency, backbone, and HVAC costs.... so that would be another 3500-5000w. So they are looking at around $4000 a year in power costs per HDD rack.


Besides, the power savings is just a side benefit. The main reason for the upgrade is the database I/O gain of 100x fold.
Well that is assuming they are using 44u with 4u models. 3PARs come in many sizes...though I honestly didn't know they came that big. this is Ebay...I would expect 2u at most or half racks or how ever you want to describe them.

But they will need about 10x the number of SSDs to cover the data storage of the HDDs. Power usage would be dropped, but when you have to have more physical drives the drop would be dimished. Then toss in the cost per GB of SSD storage there is no way the energy saving would eat it.

A SSD will not help the performance of a Web server...It doesn't matter how fast the data is read from the storage drive. The data can only reach the users' machines as fast as their ISPs allow. Though I've never looked into how a SSD handles multiple read requests going to the same drive since i never deemed them an option for server use. Can multiple reads be done simultaneously or are they queued? This could affect performance...but nothing compared to the bottleneck of the Internet (save for you lucky folks that have 1GBs connections).
Edited by Vagrant Storm - 8/4/11 at 7:46am
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post #8 of 16
Quote:
Originally Posted by Vagrant Storm View Post
But they will need about 10x the number of SSDs to cover the data storage of the HDDs. Power usage would be dropped, but when you have to have more physical drives the drop would be dimished. Then toss in the cost per GB of SSD storage there is no way the energy saving would eat it.
Depends too on if they were using mass amounts of those 15,000 RPM drives to maximize performance in RAID and such, those aren't exactly cheap either. And if they can cut down on heat and space by as much, that also factors into cost (I don't know if the 78% power savings takes into account less AC cost to cool the datacenter or not). And even after that, you're going to have to take into account other factors such as reduced deployment times. They said it cut down adding virtual machines from 45 minutes to 5, that's a massive boost to productivity.

Quote:
Originally Posted by Vagrant Storm View Post
A SSD will not help the performance of a Web server...It doesn't matter how fast the data is read from the storage drive. The data can only reach the users' machines as fast as their ISPs allow. Though I've never looked into how a SSD handles multiple read requests going to the same drive since i never deemed them an option for server use. Can multiple reads be done simultaneously or are they queued? This could affect performance...but nothing compared to the bottleneck of the Internet (save for you lucky folks that have 1GBs connections).
A data center is generally not going to be bandwidth limited. Performance is very much dependent on the speeds of the machines (particularly storage for anything database intensive, which is practically anything nowadays).

I'm definately happy to see more SSDs in enterprise usage though, I want some better statistics on how these babies last after a few years.
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post #9 of 16
Don't forget that they're using (hopefully) enterprise class HDDs already, so the price difference in moving to SSD is not as great as it may first sound to personal consumers. Also, the heat has to be dissipated, so you can count each watt saved as almost 3. (2 watts to remove 1 watt of heat in an efficient system iirc)

EDIT:
On top of that
Quote:
The time to roll out a new VM is now five minutes compared to 45 minutes on the old system according to eBay.

Edited by heraisu - 8/4/11 at 8:15am
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post #10 of 16
I do believe that it will be worth it for them in the long run.
    
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