Device /dev/disk/by-partuuid/XXX is causing slow I/O on pool

[lenard2000]

Hi All,

Recently I have been getting an error claiming that my APPs pool is experiencing Slow IO due to some issue. However, I am not sure what the issue is, and based on my research, it is usually related to SMR drives. However, my drive is not an HDD but an SSD, so I should not be having this problem.

I also saw that a couple of guys on reddit claimed that they had the same issue with SSD but no one replied.

Does anyone know what could be the issue?

Hardware:

Question	Hardware
Motherboard make and model	Asustek P7P55D-E LX
CPU make and model	Intel(R) Core(TM) i5 CPU 760 @ 2.80GHz
RAM quantity	32GB DDR3
Hard drives, quantity, model numbers, and RAID configuration, including boot drives	See the below.
Hard disk controllers	No External Hard Disk Controllers
Network Cards	No External Network Card.

Hard Disk Configuration:

Brand	Model	Type	Size	Speed	Pool	Deploy Date
Seagate	Exos X18 Enterprise Class	HDD (CMR)	16TB	7200 RPM	Storage 1	06/09/23
Seagate	Exos X18 Enterprise Class	HDD (CMR)	16TB	7200 RPM	Storage 1
Crucial	BX500	SSD	1TB	6GB/s	Apps	04/09/23
Crucial	BX500	SSD	1TB	6GB/s	Not Assigned Yet
GoodRam		SSD	120GB		Boot
Crucial	BX500	SSD	240GB	6GB/s	Boot	11/11/2023
Crucial	BX500	SSD	2TB	6GB/s	Temp	11/11/2023

I look forward to any feedback that anyone can give me :)

 

[lenard2000]

Code:

WARNING
Device /dev/disk/by-partuuid/69040800-2564-4c22-b837-79db52ad3c18 is causing slow I/O on pool Apps.
2023-11-13 14:54:18 (Europe/Malta)

 

[lenard2000]

Following up on here. Any ideas of what the issue could be? Any feedback will go a long way in troubleshooting the issue.
Weirdly enough, the error went away on its own but it comes back from time to time.

 

[NugentS]

[Guess] I wonder if you have written a lot of data to the disks, exhausted any cache so the SSD performance has hit its brick wall. You would then have to wait for the SSD to sort itself out and restore performance, until you exhaust it again.

This would be an issue with consumer SSD's, of all sorts. As they lie about their performance. Enterprise SSD's are more honest.

I had the same issue on a pool of cheapish NVMe drives (since removed) yet my pool of Intel DC SSD's (SATA) have no issue.