Win10 - Tiered Storage Space unsuable performance

I know it's an old thread, but maybe this is still helpful to someone.

I've dealt with badly performing MSS like the OP's before.
Turns out that, ironically, the worst thing you can do to a freshly created Storage Space is to create a partition in the GUI.
I don't know what exactly goes wrong when you do that (aside from the small additional partition that windows creates on the SS), but erasing all partition (e.g. using Diskpart "clean" command) and creating a proper partition manually brings drives and virtual disks back up to full speed.

Last time I made the mistake of trusting Windows with the difficult task of partitioning a drive, read performance was cut down by half, writes were even worse. 3500MB/s seq read instead of 6000, 700MB seq write instead of 2000. Random reads were down to 5MB/s. On an NVMe PCIe3 8x cache drive ... . Good job Microsoft, good job Storage Spaces team. Terrific work.
Apparently that bug's been there since 8.1. But isn't it nice that we finally have Emojies in Win11? Suuper.
If it doesn't carry "Azure" or "Office365" in its name, its nothing more than an afterthought these days.

[/rant] Anyway, so I quickly cleaned the virtual disk in Diskpart and created a partition manually. Disk was back to full performance immediately.

SMART testing is designed to check drive parameters and predict drive failure.
Unfortunately drives can have excellent SMART and have already failed.

When using software to check SMART each software may check any parameter and provide scoring.
The checked parameters and the scoring may be different with each software.

A drive may pass one test and fail another.

Please run the following tests:

1) HD Tune: (free or trial version)
https://www.hdtune.com/
Post images or share links for results on these tabs:
a) Health
b) Benchmark
c) Full error scan

2) Sea Tools for Windows
https://www.seagate.com/support/downloads/seatools/seatools-win-master/
https://www.seagate.com/support/kb/how-to-use-seatools-for-windows-202435en/
long generic test

3) Run the Crucial scanner:
https://www.crucial.com/store/systemscanner
Post a URL displaying the results.

If the logs are English they can be scanned for reported problems.

https://www.tenforums.com/tutorials/3813-add-remove-change-display-language-windows-10-a.html

https://www.tenforums.com/tutorials/136792-change-display-language-windows-10-a.html

https://www.tenforums.com/tutorials/83827-create-storage-space-storage-pool-windows-10-a.html

https://www.tenforums.com/tutorials/83769-optimize-drive-usage-storage-pool-storage-spaces-windows-10-a.html

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@Limitless Technology
Unfortunatly I've already tried your tips 1,2 and 4. Even in the disk benchmark (see below) the write speeds are horrible.

Ive run the DISM and sfc tool and used a fresh user account to do the benchmark.
Neither solved the problem.

Hi @Johannes Timm

Thank you for your question and reaching out.

I can see from the Description you have "storage space from a failing hardware raid" which can slow down the Read operation and because of it will slow the Write to other disk

1. Please try to copy from Healthy Disk to Tiered Storage space volume
2. Disable any Antivirus program or Windows firewall you may have for temporary purpose.
3. Try to Boot your PC from Safe mode and copy the Data
4. Use RoboCopy instead Windows explorer for copy-paste.
5. Also try to run some Disk performance Bench mark tools (CrystalDiskMark) or DiskSPD to measure correct performance of your storage space.
   https://learn.microsoft.com/en-us/azure-stack/hci/manage/diskspd-overview

https://learn.microsoft.com/en-us/archive/blogs/josebda/using-file-copy-to-measure-storage-performance-why-its-not-a-good-idea-and-what-you-should-do-instead

Hope this answers your question :)
Thank you.

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