Why are my drives so slow?

[Netbug]

Version: 6.8.2

Plugins: Preclear Disks, CA Auto update Applications, CA Backup/Restore Appdata, CA Cleanup Appdata, Community Applications, Dynamix S3 Sleep

Dynamix SSD TRIM, Dynamix System Information, Fix Common Problems, Nerd Tools, Open Files, Statistics, Unassigned Devices, unBALANCE, User Scripts

 

Hardware:

• Case: Lian Li PC-A77FB
• Motherboard: Asus X99-A II ATX LGA2011-3 Motherboard
• Processor: Intel® Core™ i7-6850K
• RAM: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory
• Drive Cage(s): 3x Supermicro CSE-M35T-1B Hot Swap Bay
• SATA Extender: Supermicro AOC-SASLP-MV8 SATA Extender

 

Hard Drives:

• Parity    WDC_WD80EFAX-68KNBN0_VDHBX7VD - 8 TB (sdb)   
• Disk 1    WDC_WD20EADS-00R6B0_WD-WCAVY5374796 - 2 TB (sdg)    
• Disk 2    WDC_WD30EZRX-19D8PB0_WD-WMC4N0J7D8TT - 3 TB (sde)    
• Disk 3    WDC_WD20EARS-00MVWB0_WD-WCAZA9034298 - 2 TB (sdf)    
• Disk 4    ST3000DM008-2DM166_Z504PPXT - 3 TB (sdh)    
• Disk 5    ST4000DM005-2DP166_WGY0E53A - 4 TB (sdk)    
• Disk 6    ST3000DM001-1CH166_W1F23145 - 3 TB (sdm)    
• Disk 7    WDC_WD30EZRX-00SPEB0_WD-WCC4E0NP7NLR - 3 TB (sdl)    
• Disk 8    ST3000DM001-1ER166_Z5029NBR - 3 TB (sdj)    
• Disk 9    ST3000DM008-2DM166_Z503HXCF - 3 TB (sdi)
• Disk 10    ST4000DM004-2CV104_ZFN0BNMN - 4 TB (sdi)
• Disk 11    ST4000DM004-2CV104_ZFN1TJV6 - 4 TB (sdc)

 

Cache Drive:

• Samsung_SSD_850_EVO_250GB_S2R5NX0J445962N - 250 GB (sdb)

 

Boot Device:

• Flash    JD_FireFly - 8 GB (sda)

 

Problem:

I was running out of space, so I picked up 2 WD RED 8TB drives. I completed the preclear for one of the drives following the instructions from the SpaceInvader One video titled "How and why to PreClear your hard drives before adding to your array".

Once the preclear was complete, I shut down the array, and restarted it with the new precleared 8TB drive in the parity slot.

The system started up again and began a parity rebuild.

It said it would take 27 days (see attached screenshot "rebuild.png"), and that seemed like a lot, but I wasn't sure so I asked on reddit. I was advised that my transfer rate was incredibly slow. I then checked the array speed (see attached screenshot "array3.png") and all of them seemed slow.

I shut down. Opened up the case and made sure all cables were secure and nothing was apparently wrong.

 

Where do I start troubleshooting this?

 

Thanks.

 

EDIT: And I just tried to check two of my dockers and I'm getting an error "Execution error - Image can not be deleted, in use by other container(s)"

 

 

tower-diagnostics-20200218-1854.zip

Edited February 19, 2020 by Netbug
Updated hardware

[JorgeB]

Try the diskspeed docker to check if all disks are performing normally.

[Netbug]

So we ended up pulling a drive (seagate 3TB) that was throwing a tonne of errors. We then replaced that drive with the old parity and the parity with a new WD RED 8TB. So, since I did it in the wrong order, I lost all the data on the 3TB drive, but I'll survive. Write speed has improved and the rebuild should take just under a day now instead of 40.

[Keith Ellis]

2 hours ago, Netbug said:

So, since I did it in the wrong order, I lost all the data on the 3TB drive, 

If you mount the 3TB drive as an unassigned device you might be able to recover some of the data. It should still be there.

[Netbug]

That's a good idea. I'm downloading a bunch now, but I'll likely pop it in later to see. Thanks.