SSD Wear Level algorithm

[Cha0s]

Hello,

Does anyone know how does Proxmox calculates the SSD Wear Level?

I've noticed that it doesn't show the wear level for all disks depending on the manufacturer.

I've got a lot of Micron and HP (Micron rebranded/reflashed) that while in HP's iLO show the wear level, PVE does not.
On the other hand, with some regular samsung SSDs, it properly shows the wear level for those.

And in another instance I've noticed with some samsung NVMe drives that the wear level reached 9% at some point and then it zeroed itself, then it got to 6% den it zeroed out again and so on and so forth.

So my question would be, what does Proxmox check exactly to calculate the wear level?

 

[oguz]

hi,

it just checks the smartctl values from this command: smartctl -H -A -f brief /path/to/drive and parses the output

 

[Cha0s]

Which values does it check? Not all drives return the same results/attributes.

 

[Cha0s]

Also, while we are at it, when does proxmox consider the smart status "Not passed" ?

I've got drives with reallocated sectors, offline uncorrectable and smart self test with LBA errors, and proxmox still shows this drive as SMART: PASSED

 

[oguz]

Which values does it check? Not all drives return the same results/attributes.

different types are parsed accordingly.
you can find the perl code here[0], function get_smart_data

Also, while we are at it, when does proxmox consider the smart status "Not passed" ?

I've got drives with reallocated sectors, offline uncorrectable and smart self test with LBA errors, and proxmox still shows this drive as SMART: PASSED

do you see PASSED as well when you run the smart command?
(PVE doesn't evaluate anything about the health of the disk and relies on smartmontools to do that)

[0]: https://git.proxmox.com/?p=pve-stor...9d93038cf470fe45ba1c7168c8d0f40a5;hb=HEAD#l76

 

[Cha0s]

I will take a look at the source code to get a better understanding how exactly it works.

Thank you for the information.

 

[KatyComputer]

Where is the wear level reported?

 

[LnxBil]

Where is the wear level reported?

Click on a host and then on disks.