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SSD IOPS recently plunged

C

Cold_B

n00b
Joined
Jun 29, 2006
Messages
51
I have a Samsung 830 ssd (256gb version) that I have had for a good while now. Recently windows and some games have started to hick-up and run real slow.

I ran the samsung magician speed test on my ssd and it takes 10 minutes to complete.
I have a sequential read speed of 286 MB/s and write of 242 MB/s.
Random Read IOPS of 2258 and write IOPS of 2088.

I'm running Windows 8.1, up to date on patches, no new hardware or software installed in the last few months. AHCI mode is on, its in a SATA 6GB/s port. Drive has the newest firmware. Drive is about 20% empty currently. System restore is off, indexing is off, prefetch is off, TRIM is on, pagefile is on another drive.

When I first got the drive I ran some speed test and it was really fast but I don't know what kind of performance IOPS I got. Windows and games were really snappy, and I really noticed the difference coming from a fast spinning drive.

Any idea what's going on? Ideas of things I can check? Thanks!
 
Cold_B said:
I ran the samsung magician speed test on my ssd and it takes 10 minutes to complete.
I have a sequential read speed of 286 MB/s and write of 242 MB/s.
Random Read IOPS of 2258 and write IOPS of 2088.
Click to expand...

Thats a bit slow for that drive, IOPS should be between a factor of 5 to 10 higher. Is that on SATA3, because the sequential speed is also low. Make sure there is nothing accessing the drive in parallel to that benchmark. Please post a CrystalDiskInfo screenshot.
 
I included a spinning hard drive as comparison.

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Album link in case links don't work.
 
It may be coming form the fact the drive is full. SSDs slow down as they fill. You could try cloning the drive to another spare HDD and secure erasing and cloning your OS back and see if it speeds back up, but im not sure its worth it.
 
200 GB is hardly full. The 830 Pro was one of the first consumer drives that was successfully tested beyond the 1 petabyte mark and was still writing at 250 MB/s then. I doubt that it is because of writes. I have two of those drives (and a third 64GB version, which is used as SRT cache, and thus completly full all the time) and they are all significantly faster, although have written less than 3 TB. Please run the "Performance Optimization" in Magician (which trims the free space) and try again.
Are you sure there is nothing accessing the SSD in parallel? Also check the Windows event log.
 
Last edited:
I ran the performance optimization, no change.

When I watch the performance tab for the ssd in the windows task manager, its barely doing anything. Nothing else is accessing it.

I looked through the windows event viewer, I don't see anything at all out of place, certainty nothing concerning the ssd.
 
Before you try anything else change the SATA cable. If that doesn't make a difference, move it to another SATA port on your motherboard.
 
Its possible it hasnt had time enough to clear unused pages, so every write is preceded by a clear, reducing performance drastically.
Or some other TRIM/Garbage Collection related issue.

Windows 8 should activate TRIM instead of the normally scheduled defrag.
A TRIM should be activated when a file is deleted (not sent to the bin).
Samsung Magician should send a TRIM.
But maybe there is a problem with activating TRIM.

Some RAID controllers wont pass the TRIM command when in RAID mode, perhaps the RAID controllers firmware or general operation has a bug?
To get AHCI operation you are using the RAID controller but normally in non RAID mode for a single drive.

I recommend checking the firmware for the RAID controller is up to date and the configuration of the controller isnt causing an issue.
Perhaps a CMOS reset will help.
 
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