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Bad write speeds on 2 SSD's RAID-0!

Pierre Dabrunst
By Pierre Dabrunst
in Storage Devices
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Okay so I got 2 Kingston UV400 120GB SSD's in RAID-0....

Read speeds are great, just over 1GB/s....  However...... The write speed SSUUUUCCCKKKSSSs are able to go up to 350MB per second writeSS.  I only get just over 230MB per second write.

Why is this happening? The SSDs are able to go to 350MB per second as shows on Kingstons own website: https://www.kingston.com/en/ssd/consumer

I get the expected read speeds from the RAID-0 but the write is less than just one SSD.  I tested with only 1 SSD and I got about 290MB per second write but now I get less than that on a RAID-0 with 2 drives.

Is there something I have to tweak? I did the RAID with Intel's built-in RAID controller on my motherboard (Z97MX Gaming-5).

Is there something I am missing here?

 

Image for reference (RAID-0, 2 drives): http://prntscr.com/gfxwwb

Thanks for any assistance you can provide.

CPU: Intel Core i3 4150 3.5GHz Socket 1150 GPU: MSI GeForce GTX 760 OC RAM: Corsair Vengeance 2x4GB Motherboard: Gigabyte Z97MX-Gaming 5

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Disable write back?

Workstation:  14700nonk || Asus Z790 ProArt Creator || MSI Gaming Trio 4090 Shunt || Crucial Pro Overclocking 32GB @ 5600 || Corsair AX1600i@240V || whole-house loop.

LANRig/GuestGamingBox: 9900nonK || Gigabyte Z390 Master || ASUS TUF 3090 650W shunt || Corsair SF600 || CPU+GPU watercooled 280 rad pull only || whole-house loop.

Server Router (Untangle): 13600k @ Stock || ASRock Z690 ITX || All 10Gbe || 2x8GB 3200 || PicoPSU 150W 24pin + AX1200i on CPU|| whole-house loop

Server Compute/Storage: 10850K @ 5.1Ghz || Gigabyte Z490 Ultra || EVGA FTW3 3090 1000W || LSI 9280i-24 port || 4TB Samsung 860 Evo, 5x10TB Seagate Enterprise Raid 6, 4x8TB Seagate Archive Backup ||  whole-house loop.

Laptop: HP Elitebook 840 G8 (Intel 1185G7) + 3080Ti Thunderbolt Dock, Razer Blade Stealth 13" 2017 (Intel 8550U)

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11 minutes ago, AnonymousGuy said:

Disable write back?

Good idea.

But,,, how do I do that? :P 

CPU: Intel Core i3 4150 3.5GHz Socket 1150 GPU: MSI GeForce GTX 760 OC RAM: Corsair Vengeance 2x4GB Motherboard: Gigabyte Z97MX-Gaming 5

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2 minutes ago, Pierre Dabrunst said:

Good idea.

But,,, how do I do that? :P 

https://support.microsoft.com/en-us/help/324805/how-to-manually-turn-disk-write-caching-on-or-off

Workstation:  14700nonk || Asus Z790 ProArt Creator || MSI Gaming Trio 4090 Shunt || Crucial Pro Overclocking 32GB @ 5600 || Corsair AX1600i@240V || whole-house loop.

LANRig/GuestGamingBox: 9900nonK || Gigabyte Z390 Master || ASUS TUF 3090 650W shunt || Corsair SF600 || CPU+GPU watercooled 280 rad pull only || whole-house loop.

Server Router (Untangle): 13600k @ Stock || ASRock Z690 ITX || All 10Gbe || 2x8GB 3200 || PicoPSU 150W 24pin + AX1200i on CPU|| whole-house loop

Server Compute/Storage: 10850K @ 5.1Ghz || Gigabyte Z490 Ultra || EVGA FTW3 3090 1000W || LSI 9280i-24 port || 4TB Samsung 860 Evo, 5x10TB Seagate Enterprise Raid 6, 4x8TB Seagate Archive Backup ||  whole-house loop.

Laptop: HP Elitebook 840 G8 (Intel 1185G7) + 3080Ti Thunderbolt Dock, Razer Blade Stealth 13" 2017 (Intel 8550U)

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3 hours ago, AnonymousGuy said:

https://support.microsoft.com/en-us/help/324805/how-to-manually-turn-disk-write-caching-on-or-off

Thanks for the link.

It worked. However not as you might think....  It did give a big difference, but in the wrong way,  It game me only 63MB write speed when none of the checkboxes was ticied.  And after having both checkboxes ticked, the system would freeze after about 3 mnutes.  Maybe I set something wrong in the RAID array I am not sure, but I am not willing to reinstall my OS again just to edit the RAID array.

CPU: Intel Core i3 4150 3.5GHz Socket 1150 GPU: MSI GeForce GTX 760 OC RAM: Corsair Vengeance 2x4GB Motherboard: Gigabyte Z97MX-Gaming 5

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