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Samsung 950 PRO NVMe 512GB - Slow

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UBigDummie

Junior Member
Does anyone have any suggestions for me? I've used the 256GB as well as this one in M.2 slots on ASUS motherboards as well as the PCIe adapter card. I've had no troubles before.

I've installed the 512GB version in a Lenovo TS140 server this morning. I migrated the drive from a Crucial SSD to the 950 Pro using the Samsung data migration software. That took about 5 minutes.

The server is working. I've had no errors, but it's a little sluggish to boot and it's not even as responsive as the Crucial SSD I was using.

I have the drive installed in a PCIe adapter card and it is in the first x16 slot. The only other slot being used is for a SATA to mini SAS card (in the x4 slot).

The Samsung Magician software shows the drive is using 4 lanes at 10Gbps, but the write speed is just over 100 Mbps and the write IOPS is less than 7,000.

I appreciate any input you guys might have...

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Can you check that write caching is enabled (right-click the drive in Device Manager and go to properties)? Can you also try some other benchmarking software (e.g. CrystalDiskMark or AS-SSD)? Finally, can you check that the motherboard BIOS is up to date?
 
Hellhammer said:
Can you check that write caching is enabled (right-click the drive in Device Manager and go to properties)? Can you also try some other benchmarking software (e.g. CrystalDiskMark or AS-SSD)? Finally, can you check that the motherboard BIOS is up to date?
Click to expand...

Write caching wasn't enabled, but I have done that now. I did try CrystalDiskMark, but it wouldn't recognize the drive - it wasn't in the list to test. I will try AS-SSD. The BIOS is also up to date.

After I enabled write caching, I ran Samsung Magician again and the read and write speeds are just about on par with where they should be. The only thing I see so far is the IOPS are still low. They are both around 50K.

I'm restarting the server now and I'll do some further testing.

Thank you!
 
Elixer said:
Don't those also throttle if there is too much heat?
Click to expand...

Personally, I don't know, but I don't think heat is an issue. This is in a 4U chassis with 6x120mm fans pulling cold air in and 2x80mm fans pulling air out. The chassis is in an enclosed server rack that is air conditioned and also has a dehumidifier. All the equipment is cold to touch.

BUT, since you mentioned it, I will look at the Temps when I get back to work.
 
I know this really isn't the place for this, but since it was a suggestion I thought I would ask.

Is it possible to make write caching persistent in Windows Server 2012? I'm having to enable this manually after every reboot.
 
I'm not sure if this is relevant here but Win 7 won't allow write caching on my NVMe drive. It says that it's incompatible.
 
UBigDummie said:
I know this really isn't the place for this, but since it was a suggestion I thought I would ask.

Is it possible to make write caching persistent in Windows Server 2012? I'm having to enable this manually after every reboot.
Click to expand...

If you are losing WB on reboot on Windows Server it probably is a domain controller and should be left that way.
 
Magician is not measuring the IOPS right. Try AS SSD, for me, this is nearer on the scores it should reach.
 
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know this is a old thread...but how did you get your nvme drive to boot on your ts140....using windows 10 and no luck...thanks
 
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