Help w/ Diagnosing Slow Parity-Sync Speeds

[chanzer0]

Hi All,

 

I'm new to unraid and recently built a PC to serve as network-attached storage. My specs are:

• CPU: Intel i5-8500
• MOBO: Supermicro X11SCQ
• RAM: 2x8GB Kingston DDR4 2666
• HBA Controller: Adaptec ASR 7805
• Cache: HP EX900 Plus 1TB NVMe
• Parity/Disks: 3x Western Digital Ultrastar DC HC530 WUH721414ALE604 Enterprise Disks

 

The HDDs I bought refurbished from a reputable online vendor and are currently plugged into the Adaptec HBA controller. I'm using 1 of the 14TB drives for parity, the other 2 for disk 1/2 and the 1TB NMVE drive as cache. I set that up and started parity-sync and formatting the drives. However, when I started up the Parity-Sync and formatting, I noticed my speeds were incredibly slow... like 3MB/s slow. It estimated 50+ days to complete my 28TB parity-sync at 3MB/s which seems wrong.


I've attached my logs here to ask for any guidance in what might be going wrong.

tower-diagnostics-20241008-0938.zip

Also, here is the DiskSpeed diagnostic benchmarks if it helps:

[JorgeB]

Diskspeed confirms that there's an issue with disks.or controller.

 

 

[chanzer0]

I ordered some SATA cables to try and connect the drives directly to the motherboard but those won't come for another few days. If I plug the drives directly into the motherboard and still experience slow speeds is it safe to say I got bad hard drives? Or are there other factors about my hardware or Unraid configuration that could lead to slow speeds?

[chanzer0]

I ended up solving this issue in a new forum, which you can see here: