Slow Disk Rebuild

[cdcoulson]

Hi all,

 

Long-time user, first time poster.

 

I've had a home-use server up (Unraid 6.9.2) and running for quite a while now, and started running out of disk capacity. I purchased a handful of 6TB drives, and I replaced my 2TB parity drive with a 6TB drive without much of an issue. Took about 12 hours to rebuild it with about 10TB of total data.

 

I followed the instructions I found in the user guide to expand/replace disks with larger capacity drives-- stopped the array, unassigned the target 1TB data drive, shut the server down, physically removed the 1TB data drive from the system and replaced it with a 6TB drive, booted the system back up, assigned the new 6TB drive in the old drive's position and then started the array. The disk rebuild started, as expected, but is cruising along at 15-35MB/s and is currently estimated to take almost 3 days to rebuild. The system is also extremely slow to respond, and in some cases, triggers HTTP timeouts.

 

I'm hoping someone can shed some light on what might be happening, here. I've attached a diag output. Thanks in advance!

tower-diagnostics-20230406-2026.zip

[JorgeB]

There are a few issues logged but nothing that explains that, at that moment it was going at about 48MB/s, which is not fast but considering you have smaller disks and depending on the position it is it might not be unreasonable, if you are not already past the 2TB mark see if speed improves once past that.