TrueNAS performance drops, any help appreciated

[Wauter]

Dear Reader,

 

I have just installed TrueNAS CORE on a new server.

 

This is a DELL R510 with dual 10 Gbit NIC's, 12x1TB SSD's, and 64GB of ECC DDR3.

 

I'm planning to use it for VM storage for a Hyper-V cluster. I have two VM hosts.

 

These are all connected up using a MikroTik CRS317-1G-16S+

 

I have just set up the pool's, and I'm now doing some performance testing on it.

Here I am using some video files (~2gb per file, around 74gb total).

 

As you can see, performance is great, basically the maximum of a 10gig link. But then all of a sudden, it drops down to 0, rises again, and drops to 0.

This obviously isn't desirable.

 

I have configured TrueNAS as following:

- One pool of 6 mirrored vdev's

- Disk mounted to Windows via ISCSI.

 

I hope someone can help me with this, or has any suggestions.

I'm new to TrueNAS, only used it one time before this.

 

Kind regards,

Wouter

 

Here are some pictures of the TrueNAS/ hardware:

 

[m9x3mos]

12 hours ago, Wauter said:

Dear Reader,

 

I have just installed TrueNAS CORE on a new server.

 

This is a DELL R510 with dual 10 Gbit NIC's, 12x1TB SSD's, and 64GB of ECC DDR3.

 

I'm planning to use it for VM storage for a Hyper-V cluster. I have two VM hosts.

 

These are all connected up using a MikroTik CRS317-1G-16S+

 

I have just set up the pool's, and I'm now doing some performance testing on it.

Here I am using some video files (~2gb per file, around 74gb total).

 

As you can see, performance is great, basically the maximum of a 10gig link. But then all of a sudden, it drops down to 0, rises again, and drops to 0.

This obviously isn't desirable.

 

I have configured TrueNAS as following:

- One pool of 6 mirrored vdev's

- Disk mounted to Windows via ISCSI.

 

I hope someone can help me with this, or has any suggestions.

I'm new to TrueNAS, only used it one time before this.

 

Kind regards,

Wouter

 

Here are some pictures of the TrueNAS/ hardware:

 

Are those drops happening when it starts copying a different file? 

When this happens what is your cpu usage like? 

This can be caused by a range of different things but to mention the limitations of the way Explorer handles smb.

Can maybe try with teracopy as well. 

[Wauter]

This is not smb, it’s iscsi.

 

im not sure about your first question. The CPU never goes over 70% usage

[Bersella AI]

On 3/5/2024 at 7:53 PM, Wauter said:

I have configured TrueNAS as following:

- One pool of 6 mirrored vdev's

- Disk mounted to Windows via ISCSI.

Then it might be due to one of vDevs becoming the bottleneck in this pool. Some checks can be undergone including running tests on each vDev respectively. Since this setup was pretty fresh for me (generally RAID 5/6 were seen in similar systems), I could only suspect defects on any of vDevs.