SSD showing 3 Gb/s instead of 6 Gb/s

[mrivers]

I have four Samsung 850 EVO 1TB SSDs in a RAID 10 array on an ASUS Prime Z370-P motherboard using IRST 16.8.3.1003. It has run great for two years, then array access slowed. In the IRST app one of the SSDs shows a SATA transfer rate of 3 Gb/s (it originally showed 6 Gb/s; the others still show 6 Gb/s). Restarting the computer makes no difference.

Any idea how to fix this?

Thanks

[n_scott_pearson]

Well, first thing I would be doing is displaying the drive's information via a different application (just in case it is a bug in the application). You could try AIDA64; it lets you try without purchasing.

If you think it is a physical issue, first thing I would try is a replacement SATA cable. Second thing is moving the drive to a different SATA port. If this doesn't help, I would be thinking about replacing that drive.

Remember that, with this particular system powered down, you can temporarily remove this drive from the system and connect it to a system without RAID enabled and check its (perceived) specs and performance.

Hope this helps,

...S

[mrivers]

Replacement drive ordered.  Thanks for your help.