Samsung SSD Sudden IOPS Drop

ScottNili

Prominent
Apr 30, 2017
10
0
520
Good day everyone,
this is my first time here so I hope this is the right place to ask this.

Now just recently, maybe about 3 days ago I noticed my PC getting as slow as it can get. I first noticed it in a game I play so I figured what the heck it might be the game. Then I figured it's in everything, from Spotify to Chrome and all my games, everything is slow even Windows itself.

At first I went all the usual ways. Normal stuff like checking task manager for unusual processes or too much CPU, RAM or the disk being used and so on. Everything looks fine, nothing unusual.

The SSD is a 250 GB Samsung 850 EVO. The disk is on automatic defrag every weekend and I do a weekly benchmark on everything including the disk so when things go wrong I have some results to compare.

After comparing all my benchmarks I found the problem to be from the SSD. Next what I did was I re-installed Windows (I do that at least once every 2-3 months), figured it's just one of those problems that solves itself with a new Windows.

Turns out it's not. Now ever since then I started doing SSD benchmarks with Samsung Magician every 30 minutes, trying to find any pattern to it, so far no luck. The only thing I noticed is that it usually starts within a minute after Windows boots up and sometimes goes away randomly on its own, then comes back again. Even when the speeds are down nothing unusual shows up on task manager, even the disk usage is at about 1% which is normal when I'm not doing anything. Same with all the other stats.

The problem itself is that based on the benchmarks, when my PC isn't slow, all 4 speeds on Magician are up to the expected limit (Sequential Read/Write and Random Read/Write). However when the system starts slowing down the benchmarks from those times show a significant drop in the Random Read/Write speeds. The Sequential speeds are still up to the limit even when the problem starts, only the random ones go down to a third or fourth of what they usually are.

I've attached two screenshots, one from a time when the PC runs smoothly and the second from when the speeds drop.

Things I've tried so far:
- checked every single driver there is, including chipset drivers. All updated
- did a chkdsk and sfc through command prompt, none of which reported anything wrong
- checked the SMART section of Magician, everything says "OK"
- freshly installed windows and all the drivers 3 times
- did a full SSD wipe, remade the partition and installed Windows again
- updated my BIOS
- changed the SATA port and the cable connecting the SSD to it (both times on SATA 3 ports)
- checked the temperature, like always running around 26 to 30 degrees celsius
- tried different benchmarking tools, same results as Magician
- checked device manager, no warnings on anything at all
- full scan with Kaspersky, 0 threats or warnings

I'll list the specs and the screenshots at the bottom, if anyone needs any further info please do let me know I'll provide them ASAP.
Thanks in advance.
One more thing, this is just a wild guess, I'm out of ideas at this point but is it possible that it's a PSU problem? Could it be that the SSD is not receiving enough power? Again, this problem showed up out of nowhere, I haven't made any changes to anything it just happened on it's own so... If by any chance it is a voltage problem, how can I test it and be sure?

MB: MSI Z170A Gaming M7 (LGA 1151)
Memory: 16GBs of Corsair Vengeance
GPU: EVGA GeForce GTX 980
Storage: Samsung SSD 850 EVO (internal, AHCI mode) + 4TB external through USB3
CPU: Intel i7 6700k
System is running a 64-bit Windows 10 Pro

P.s. nothing is overclocked.
The images are not showing up for some reason, I'll just leave the links here.
http://imgur.com/kvUAa9C
http://imgur.com/9wf0g2A

kvUAa9C


9wf0g2A


Edit: I've tried every single solution to anything related to slow random read/write SSD speeds on this website so please don't redirect me to any other thread, I promise you I've already spent 2 days going through them all.
 


Thanks for your reply, I have been talking to Samsung as well but they offered no help. How are you going to send it back to warranty? Is it even included in the warranty to be safe against such problems?
 
HI in my case after i send some screenshots with all the test and the dxdig file , they put me to apply for a RAM procedure , witch i need to send the ssd to them. I dont know if this is part of warranty or just they want to check on there end as well if the ssd is working properly or not . But i will wait until tomorrow , today is bank holiday in UK and i didn't get any answer for where i buy the ssd. I will let you know after tomorrow
 


What does a dxdiag have to do with an ssd? Well anyway I'd appreciate the update.
 


Hi Palorim12 and thanks for the reply.
Yes I have. I've used Crystal and AS SSD (If I remember the name correctly). All three report the same numbers. I was advised by a Samsung employee to use the latest version of Magician (V5).

I don't know why he thought changing a benchmark tool would change anything since I already told him that 3 different programs reported the same numbers. Anyway I still did update to V5 and again, same numbers.

Today I went through a checklist for improving SSD performance on Windows. Things like prefetch/superfetch being disabled, disabling auto defrags, disabling indexing and checking the power settings to see if it's set to power saving mode. Nothing helped, still the same problem.

Although I have to say the past 24 hours it has started immediately after Windows boots up and has never gone away. I wrote earlier that it goes away after a couple of hours, it doesn't anymore. Seems to me like it started as a minor problem that comes and goes and it got worse during the 3 days.
 
I was reading through, too see if I missed anything. What do you mean by "The disk is on automatic defrag every weekend"? Do you mean actual Defrag, or are you talking about the Optimization feature built into Windows 8 and 10, which it does on SSDs instead of defrag?
 


First of all sorry about the "best answer" I missclicked the link in the email notification.

So back to your question. Yeah by defrag I mean the optimization feature in windows, it used to be called Defragmentation I guess I'm still used to that. It has always been on a weekly schedule to optimize the drive. I also read somewhere today that I actually shouldn't be doing that to an SSD since it reduces their lifespan. But anyway yes that's what I meant