About the speed of SATA3 SSD on SATA2 controller. Is there a reason?

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sllrod2015-03-20 15:06:25

Solid State Drives

sllrod, 2015-03-20 15:06:25

Colleagues, good afternoon!
The other day it was decided to "revive" a server based on X8DTL-i (with a SATA2 controller) using an SSD. As the latter, the 240GB Intel® DC S3500 series SSD was chosen as the best in terms of price-quality ratio.
It is clear that the performance of sequential reading of this disk (which, according to the tests, is 400-450Mb / s), for example, is greater than the bandwidth of the controller (300), the question is different. Basically, the disk will contain small files and a database. Who knows the mechanics of communication between the SSD and the controller, answer: in this case, the bandwidth will be the "ceiling" of disk performance, or the old interface will reduce any disk speed indicators, including those not exceeding 300MB / s, such as random reading?
Thank you.

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4 answer(s)

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Artem @Jump, 2015-03-20
@sllrod

No difference.
The speed is limited to the ceiling of SATA2 only during sequential reading, which is extremely rare.
In general, all you lose is that you won’t be able to get great linear reading performance on synthetic tests.

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hbuser, 2015-08-06
@hbuser

Was puzzled by the same question.
I can only quote a paragraph from a good article.
Obviously, you will get a noticeable boost in system responsiveness even using a SATA 3Gb/s connector. In practice, the 3 Gb/s interface does not hinder the performance of mainstream applications. The SATA III interface comes into play in synthetic benchmarks that push technology limits, in workstation/server tasks, or when transferring large amounts of data from SSD to SSD.
Source: www.thg.ru/storage/ustanovka_ssd_v_sistemu_s_sata_...
The article is more than exhaustive. Unlike the answer, which is marked as a solution, there is evidence.

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Vlad Zhivotnev, 2015-03-20
@inkvizitor68sl

SSD is valuable not for read / write speed, but for the number of IOPS, which is thousands of times higher than that of mechanics.
So yes - there is a reason, despite the fact that the read speed will be 3gbps.

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ShamblerR, 2015-03-20
@ShamblerR

The main plus of ssd is a fast search for files, and not their speed, in fact, ssds do not physically have heads. this is a real plus when you get rid of the mandatory delays when accessing each file, while the speed of reading the file itself is great but does not affect performance as much.
in short
Everything will be a bundle.