Storage Spaces Tiering Performance Problem

Question

I'm seeing very poor performance from Tiered Storage Spaces, hoping someone can help idendity what I am doing wrong.

• I have 2x256GB SSDs and 2x2TB HDDs.
• Individual drives perform as expected
• My previous experience is that a two drive tiered storage space performs nearly as well as the SSD used in the tier
• I am able to create tiered storage spaces with two or four drives.
• Performance for two drive and four drive configurations is slightly better than the HDD performance and far from the SSD performance
• I'm using DISKSPD.EXE to measure performance

The relevant informantion is listed below, let me know if there is anything other information that may be helpful. Thanks for taking a look.

-Rob

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Performance Summary

Media	MiBS	IOPS
HDD	1.2	154
SSD	172	22,000
Tiered	3.1	408

Storage Media

Performance of Individual Drives

Create Two Drive Pool and Storage Tiers

Create Virtual Disk and Volume

Performance of Two Drive Storage Space

Answer 1

Hi Rob,

Thanks for your post. To troubleshoot low performance in Storage Spaces Tiering, you can:

1. Run Storage Tiers Optimization on demand to optimize storage tiers outside the usual schedule

https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn789160(v=ws.11)

2. If a reboot occurs on a node during maintenance, remove the affected virtual disks from CSV to put them in the available storage group in the cluster

Best Regards,

Ian Xue

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