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Gigabyte GA-M750SLI-DS4 - Boot -"Detecting devices" does not see SSD on sata2_4 and 5

Posted on 2010-08-17
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Just installed a pair of SSDs, and plugged them into the raid-only SATA2_4 and SATA2_5 sockets, and the boot menu hangs on "Detecting Devices"  I unplugged my other raid drives and plugged into sata2_0 and 1, and the SSD drives are detected.  I can't find anything in the mobo manual that says anything about those 2 ports except that they only accept raid.  Anything that I am missing?  I went ahead and created a raid 0 array with the 2 SSDs, and am currently cloning my C drive to the arrray.  Should the mobo recognize the array if I plug it back into ports 4 & 5 after I complete the clone?  I had 4 Raptor 74 Gb drives in a raid 0 on the first 4 sata ports, and I'd like to be able to use them.
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Question by:donno46
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by:David
ID: 33459616
Unfortunately, a fair number of embedded RAID controllers simply do not work with SSDs.   Furthermore, in your case, the embedded RAID chip would most likely slow them down, if you have premium SSDs.  Best thing you can do is try to disable RAID, and if that does not work, google the make/model of SSD with +gigabyte and/or your motherboard model, and see if other people report the problem.

Realize that these $5.00 RAID controller chips simply aren't designed for compatibility with SSDs.  Even if it did "talk" you would still potentially have to deal with wear-leveling (TRIM), on many SSDs, which would mean performance degradation over time.

Software-based RAID0 is appropriate and best practices.  So turn off the RAID, and let windows do striping for you.   However, be aware of the performance characteristics of the SSD.   RAID0 does NOT always mean better performance.  You have to qualify that with NTFS settings, and the type of I/O operations and block size.  
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by:donno46
ID: 33460623
I don't think that you understand what my question is.  My problem is my last two sata connections don't appear to be readable.
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by:David
ID: 33461028
Sorry, you are right.   The embedded RAID controller features are specific to the marked ports.  If you use them to create a logical RAID device, then that device will NOT work if you migrate it to other ports.  Once you put the other array back in 4/5 it will come back.  The controller reserves a little bit of room starting at physical block #0 for metadata.  The metadata stays with the disk / SSDs, so this is how it knows the config.
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donno46 earned 0 total points
ID: 33465793
Glad that I didn't get your answer until after I played with my configuration this morning. Turns out that by creating the striped array with the 2 SSDs in port 0 and 2, cloning the OS & programs drive to the new array, and moving the array to ports 4 and 5, I was able to plug my old array back into ports 0 through 3 and have everything work.  Love the speed of the striped SSDs.

Don
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