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Is there any performance loss when connecting a SATA SSD to a SAS controller? Edit: Assume the controller doesn't have SATA connectors and I use a SATA to SAS interposer. Will there be any performance loss to either the SSD or the other drives (I have 2 146GB SAS 15K RPM Drives in RAID 1)

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2 Answers 2

From what to what? you don't say - let's assume you mean will the SSD perform at a lower level than if connected to a SATA controller - if that's the case then I'd suggest not, if the controller supports SATA then it'll act like a SATA controller so you shouldn't see any drop off. If you mean something else then please clarify.

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thanks, edited. –  Meidan Alon Aug 15 '09 at 7:58
    
thanks for the edit - yes, doing that would introduce latency so performance would inherently suffer - there's loads of SATA & SAS controllers about, why not pick one of those up? –  Chopper3 Aug 15 '09 at 9:24
    
how much latency are we talking about? could it be slower then a regular HDD connected directly with SAS? also, can you recommend such a controller? –  Meidan Alon Sep 13 '09 at 17:31

Well, first you have to verify that you can connect the drive at all! Second, this would seem to be a simple math problem- Throughput of the SAS card's bus, divided by number of SSDs on the card / or theoretical bandwidth of each SSD, compared to a similar calculation using the SATA interface.

In terms of software, it's really 100% dependent on what you're running, what drivers you have, and what kind of server setup you have. My suggestion would be to bit the bullet, get a test set of kit, and run a benchmark.

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