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Intel Rapid Storage Technology for RAID 0 SSDs, help!

post #1 of 2
Thread Starter 
Hello!

I'm trying to get my DPC latency as low as possible, I have a 2TB RAID 0 SSD with two 1TB Samsung Evo Drives and I have noticed that Intel Rapid Storage Technology is set to boot up on startups, but that's not the issue.

Thing is, after trying LatencyMon for unrelated issues (Nvidia's drivers) I have noticed that my 2nd biggest DPC latency source was my sound setup (Which I changed and just ordered this one as I hear is the best for RAW DPC latency performance), I've been reading some info on the net but I haven't found anything that answers my question.

I know Intel Rapid Storage Technology is for SSDs when using RAID 0 and is not necessary to have it running when using a single SSD, what nobody seem to explain is, does it even do something for my RAID 0 like TRIM? Is it important? What exactly does it even do?

I don't care about power management, I need RAW performance, I'm so bummed by this that I'm willing to go back to a single SSD for the OS without this RAID 0 setup if it means to get rid of this extra DPC latency coming from this Intel Rapid Storage process.

So, the question comes down to, can I disable it? Will I lose something important like TRIM? Is it useless? What exactly does it do?
post #2 of 2
The 1TB SSDs will have a RAID controller inside them already. So you are RAIDing two RAID controllers, which would introduce overheads.
Theoretically, benchmarks show a performance increase with RAID 0 ssd's, but i think there is enough info to show that you don't see in the real world, and in fact sometimes there is a performance decrease from RAID 0ing SSD's larger than 120GB.

TRIM is not hugely important these days if you manage your ssd space well.

TRIM is basically where when you hard delete something, the SSD controller is told to clear those related memory cells, as opposed to clearing the addresses from the table (so the data looks like its gone) but really its still taking up the memory location. I think it also has to do with how data shares memory cells in many SSDs (2 bits per cell, or 3 with Samsung 8/950's?)
Any time you shift+delete, empty recycle bin or format the ssd, it is TRIMmed.
TRIM is controlled by the OS and controller driver.

If you keep 20% of your drive free, TRIM probably won't matter so much.


In RAID-0 i think you actually don't want TRIM. Given that your data is spanned across two drives, a TRIM command might accidentally wipe data from one drive that is part of the stripe. Then you've lost your entire array.

edit: but apparently since 7-series chipset, RAID-0 TRIM is supported, so there you go.
Ol'Faithful
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Ol'Faithful
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CPUMotherboardGraphicsRAM
Intel Xeon x5660 P6X58D-E XFX AMD Radeon R9 280X Corsair Vengeance 24 GB Triple Chanel 6x4GB 
Optical DriveCoolingOSMonitor
Lite-On DVD-RW Noctua DH-14 CPU Cooler Windows 7 Pro x64 Samsung 24" LED 1080p 5ms DVI (S23A300B) 
PowerMouseAudio
Thermaltake Toughpower 750W Gold Corsair M95 Onboard :S 
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