Pool is DEGRADED, reasons ?

[Singman]

Hi,

I have a Freenas with 4x WD RED disks (config in signature).
My pool is marked as DEGRADED :

First, I changed all the disk (they were less than 1 month old). But 1 month later, my pool is in DEGRADED mode again.

I've run a short SMART test on all disks :

Well, no SMART errors, and error log (smartctl -l error /dev/ada...) is empty too.

But pool is still having some errors :

So, could it be related to SMR drives ? Memory problem ? Something else ?

 

[Samuel Tai]

Unfortunately, all your drives are SMR.

List of known SMR drives

Hard drives that write data in overlapping, "shingled" tracks, have greater areal density than ones that do not. For cost and capacity reasons, manufacturers are increasingly moving to SMR, Shingled Magnetic Recording. SMR is a form of PMR...

www.ixsystems.com

 

[Singman]

Thanks for the link. I'm trying now to replace thoses disks with some Seagate IronWolf (CMR).