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[DailyTech]EBay moving to SSD - Page 2

post #11 of 16
Quote:
Originally Posted by Vagrant Storm View Post
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.
That's a moot point. It does not matter if they are using since 10 2U is about the same as 5 4U.

It is still a 1 to 8 reduction of storage disks and reduction in controllers/servers/HVAC. The power savings are significant and not just in the 100-150w range. Another benefit is the physical space.... datacenters only have so much avaliable floor space, HVAC capabilities, and power capabilities.

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.
Storage space isn't the issue. Besides enterprise disk storage costs much more than consumer storage. They are probably not paying a $50/1TB. They are probably paying a few hundred per 1TB HDD already so the leap to $1000/1TB is not as bad.

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).
The SSDs are not for a web server. It is for database servers which are I/O limited. The database servers gets requests from the web server(s) for hundreds of eBay users simutaneously. The database server then has to scan through the tables to retrieve the data. This is highly random data. SSDs can do this type of work MUCH faster than any HDD. Bandwidth isn't an issue since datacenters have backbone connections and are servicing ten of thousands of users simutaneously.


http://www.dell.com/downloads/global...Cade-final.pdf
14x 10K RPM HDD = 5.5K IOPS, 1s latency for 350 users, 40 transactions per second
4x SSD = 76K IOPS, .1s latency for 350 user, 600 transactions per second



http://www.tomshardware.com/reviews/...te,2923-5.html
Quote:
We simply get significantly higher I/O [with SSDs] at a lower cost than we'd be able to get with standard drives. We've had many customers needing more I/O than what 4x 15k RPM SAS drives in RAID 10 provide, and an upgrade involves moving to a larger server chassis to support more than four drives, a larger RAID card, etc. Other configurations have needed 16+ 15k RPM drives to get the necessary I/O. Going with a single SSD (or a couple SSDs in RAID) greatly simplifies the configurations and makes them much cheaper overall.

http://www.stec-inc.com/downloads/SSD_Guide.pdf
1 Enterprise HDD = 350 IOPS
1 Enterprise SSD = 50-80K IOPS
Edited by DuckieHo - 8/4/11 at 8:52am
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post #12 of 16
This is great news. This should give us some real-world hard numbers on SSD reliability and longevity when used in enterprise environments. Hopefully eBay will release those results when available.
post #13 of 16
Exciting! Good to see such a large company taking the plunge on SSDs. From reading the posts in this thread, it sure sounds like the best option long as they will last a long time.
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post #14 of 16
man... that's gonna be a lot of SSDs.
post #15 of 16
For database servers, SSD do have an advantage from a performance, power consumption, and physical footprint standpoint. Deployment times are much faster. I presume eBay already has a team that did these cost-analysis calculations to see if it is worth it.
Edited by Riou - 8/4/11 at 11:44am
post #16 of 16
Duckie for president
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