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M4 128GB RAID 0: Write speeds decreasing over time

post #1 of 12
Thread Starter 
I have a 128x2 RAID 0 array connected to SATA3 ports. I have the latest version of Intel RST (11.7) installed.

When I first created this array, I put an image that was around 125GB on the array. The following were the results in CDM:



Now, a few months later, the array is 95% full with about 11/256GB free. The following are the results now:



It is my understanding that speeds are due to decrease as the drive fills up. However, the fact that read speeds are staying fairly constant while write speeds are significantly decreasing has me worried. Specifically, I'm worried that TRIM may not be working properly because as I understand it, a non-TRIM RAID0 SSD array will continuously lose write performance over time.

I need expert opinions as to whether I have a problem, and if so, how I should approach solving the problem.

Thanks in advance.
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post #2 of 12




actually i envy you
Edited by sixor - 1/26/13 at 10:49pm
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post #3 of 12
Someone please correct me if im wrong, but I dont think TRIM is enabled in RAID.
Though that may be outdated info.
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post #4 of 12
Quote:
Originally Posted by PhilWrir View Post

Someone please correct me if im wrong, but I dont think TRIM is enabled in RAID.
Though that may be outdated info.

some time ago, yes
now we have trim raid0, maybe just z77 and z68, something like that

i have z77 and trim with raid
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post #5 of 12
Thread Starter 
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post #6 of 12
By my understanding, SSDs degrade in performance the more you slab onto them.
post #7 of 12
For maximum performance, you are supposed to allot 50% of the SSD storage. That means only using 50% of your storage.
post #8 of 12
Even without TRIM the RAID0 drives kept working on just fine thanks to GC, your problem is
Quote:
Originally Posted by littledonny View Post

the array is 95% full with about 11/256GB free.

There's no free space to do anything so all your writes are being impacted as it needs to do them the hard way instead of simply writing to a clean block (or whatever they want to call it).
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post #9 of 12
A Z77 chipset board with an IRST Option ROM of 11.0 or higher, and an IRST driver of 11.0 or greater will have TRIM functioning on a RAID 0 volume. All Intel 7 series chipsets that support RAID (except X79) with the requirements I listed will also have TRIM in RAID 0. Your MSI Z77 board should have RAID 0 TRIM.

A few savvy PC users have learned how to modify the BIOS/UEFIs of Intel 6 series chipset boards to allow TRIM in RAID 0. Some users claim that works, others don't think so. Apparently, the Intel 6 series chipsets (Z68, P67, etc) do not have RAID 0 TRIM simply by choice by Intel, but it may not be that simple.

As others have said, the low amount of free space on your RAID 0 volume will cause a decrease in write performance, with or without TRIM. The Crucial m4 has a minimal amount of non-user accessible free space, know as factory Over Provisioning (OP). Note that SSDs that are sold as 120GB and 128GB have the same amount of NAND space available, but the 120GB models have 8GB more factory OP space than the 128GB models. The same thing applies to 240GB and 256GB SSDs, as well as 480GB and 512GB SSDs. The capacity difference between the two is factory OP.

Read speed is not affected by a lack of free space alone, but can be reduced a bit if the SSD is not receiving TRIM commands. Your read speeds look fine, so it looks like TRIM is active in your system. Your write speeds would be worse if you did not have TRIM.

A lack of empty space makes it more difficult for TRIM to be applied to a SSD, so in that sense TRIM is not working as good as it could be. Since your RAID 0 volume is very full now, write speed is likely not a significant factor, since you can't write much more to it anyway.

Are you doing Windows Disk Cleanups, and removing old Windows Restore points, to free up space? Or move files off the SSD to other storage. You could try logging off Windows and let the system idle for hours or overnight, to give GC a chance to work, but you won't regain new performance on SSDs that are that full.
post #10 of 12
Quote:
Originally Posted by aznpersuazn View Post

For maximum performance, you are supposed to allot 50% of the SSD storage. That means only using 50% of your storage.

This^

There was a thread or an article that I have read about this. I think it's by design that there is a certain percentage of you data you can store in SSDs. Once you reached that threshold, you'll experience slowness.
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