New to FreeNAS, but have an issue with every 3 second disk access (like a heartbeat!).

[triclonedave]

Hi all,

I'm very new to TrueNAS and thought I'd start with TrueNAS Scale as I didn't want to be peering over the new releases shoulders in terms of features!

I have a HP Microserver Gen 8 with 4 x 1TB WD drives passed directly through to TrueNAS (no hardware RAID).

I've setup a pool with 2 of the 4 drives and played about with that configuration, then destroyed the pool and created a pool with all 4 drives.

As soon as I assign a pool for the Applications, I get a heartbeat like disk access every 3 seconds or so! This is before I've even installed any Applications. I've left the machine overnight in case there was some "preparation" going on, but it was still pulsing with disk activity in the morning.

I looked at the forums and read about moving the system dataset, which I did to the boot SSD, but this makes no difference.

"Unsetting" the Application Pool fixes the issue, but then of course, I can't install any Applications!

Is there some fine tuning for this Application pool (ix-applications) that I'm missing?

Thanks

 

[sretalla]

So for sure the System Dataset would be partially responsible, but with Scale comes Kubernetes and you're now running that if you enabled apps, so there's a built-in system of checks and corrections to keep the apps running which is the cause of the frequent activity.

It's a clustering technology (even if you can't yet cluster the apps part... it's coming in future releases), so "heartbeat" is an actual term used in that technology and should be no surprise here.