Disk Write Pulses From APP Pool

[SamuelNas]

Hello,
I am running TrueNAS-SCALE-22.02.0.1 and after selecting the pool for my applications. I noticed that that pool writes to the disks every 30 seconds for less then a second . This is a simple 4 disk NAS with one data pool and boot pool. I can only tell the issue is happening because I can hear the disks. I have not been able to find a way to nail down the cause of the pulse other then when I disable the app pool the issue stops. I am not sure if these pulses are normal or not but since I have to keep the NAS in the office. The pulses do get annoying so I disabled Apps for now. Any advice on what is causing the pulses and how to change the frequency of them?

 

[NugentS]

gtoogle is your friend. This question has been asked and answered many many times

 

[SamuelNas]

Yep I have googled this. Most information is on TrueNas/Freenas not Truenas Scale. I have moved my System Dataset to the SSD. So it's not related to that. Monitoring top I see k3s-server, asyncio_loop and dockerd as my top processes. Which makes me think it's something to do with the kubernetes engine unique to scale causing this.

 

[sretalla]

it's something to do with the kubernetes engine unique to scale causing this.

Yes, that's your answer... the k3s basic services are performing checks and logging things all the time. It's by design and not a fault/problem.

The apps pool is therefore better suited to a pool of SSD if noise is a concern.