Intel Z77 RAID 5 sucks.. What now?

kemperkipie

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I have 5 x 2.0TB disks. I wanted to set them up in RAID 5 on my Asus Sabertooth Z77. I got everything working, but it turned out the Intel onboard RAID-controller is so terribly slow, it gives me a maximum of 17MB/s write speed because of the Parity-things it has to do.

Now I want an alternative.
I'm not affraid to spend some money, but I won't go too far over €100,-

I'm going to put a lot of my Media on this RAID-array and will use it as NAS for other PC's in my network and maybe even as personal cloud. So it would be nice if the data is a bit secure. It's not important enough to go RAID1 though. I have a seperate RAID-1 running for more important DATA.

Most people would say: GET A DEDICATED RAID-CONTROLLER!
I would love that, but the problem is, I'm out of PCIe space....
My 2 GTX680's cover most of the PCIe slots. I could only put my Soundcard in a PCIe x1 slot above the top GPU.

I don't know how real this PCIe extension cables are, and if I could fit one to crawl out underneath my bottom GPU to a PCI Bracket just below the motherboard (My case has enough space).
If this is adviced, what controller would be best for RAID-5.

Another option, RAID-controllers connected through SATA? I've seen some RAID-controller that are connected to 1 SATA port while they manage a RAID-volume on their dedicated controller. I can't find any SATA-600 ones, so I guess they are not very popular.. But if this is an option, it's even easier.

Any help would be great, thanks!

 
Solution
A UPS normaly is used to prevent unexpected power failures that could cause data loss. Other than using write-back, a way to improve performance of RAID 5 is to install a controller like the LSI 9265-8i with 512Kb cache, but that would exceed your budget. On the other hand you may be able to find a used RAID controller on eBay that would still be fast enough to meet your requirements.

kemperkipie

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How can a UPS bottleneck the performance of a RAID controller? I know I can risk some cached data if I enable write-back, but it doesn't improve my performance that much anyway.

I've seen the thread you linked, but none of the solutions worked at my setup.
 
A UPS normaly is used to prevent unexpected power failures that could cause data loss. Other than using write-back, a way to improve performance of RAID 5 is to install a controller like the LSI 9265-8i with 512Kb cache, but that would exceed your budget. On the other hand you may be able to find a used RAID controller on eBay that would still be fast enough to meet your requirements.
 
Solution