Nvme different physical sector size

TrueNAS General
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1

I got TrueNAS up and running and am looking at the drives I have installed. It looks like my nvme drives have a different physical sector size.

Will this cause performance degredation?

root@truenas[~] lsblk -o NAME,LOG-SEC,PHY-SEC
NAME      LOG-SEC  PHY-SEC
nvme0n1       512     4096 
nvme1n1       512      512
2

Not really.

You probably want to set the AShift value to 12, (for 4096 byte sectors). In the future, if / when you change out “nvme1”, it’s replacement might by 4096 byte sectors.

3

Usually, you can format your NVMe drive to 4K. Moreover, ZFS docs encourage you to do so.

Proceed with care.

4

I haven’t done anything yet. I’m just now starting to install TrueNAS. So, I should set AShift to 12 with my current setup?

I think this is only related to LOG-SEC and not the PHY-SEC. Can you reformat and change physical sec?

5

Not very familiar with the topic. But my d5-p5530 drives show both LOG-SEC and PHY-SEC as 4096 (on the machine that I have them formatted on) and 512 (on the machine I have not formatted them it on).

All this 512e backward compatibility BS is kinda annoying actually…