da8 failed after disk replacement

[Kosta]

Hello,
sorry for bothering again, however I still have troubles.
I replaced an old-ish Seagate 2TB Barracuda on da8 today, thinking it was kaputt.
Repair went through, Pool was green, all disks OK.
Looking a bit later again, I see it is degraded again, and again da8.
I'm using LSI 9211-8i in a Supermicro X11 server (DIY).
Is there some kind of advanced troubleshooting I can do here, or do I have to take the disk out and do some extensive tests in my PC?
I am not excluding the fact that it could be the card or cables, but first looking at the obvious: Amazon packaged the drive extremely poorly, only in a big thin envelope, with only one layer of thin bubble-wrap and antistatic bag.
I will most likely first return it before I attempt anything else...
But ideas are welcome.
Thanks

 

[sretalla]

You could run badblocks on it.

You could also consider changing the cable and/or port on the HBA.

 

[Kosta]

Thank you. I will move the data and start destructive tests.
Can this be actually one on single disks without moving data, since I use RAIDZ2? I can test it out after I copy the data.
The new disk is on the way, should arrive tomorrow, I will repeat the tests and will also try swapping the cables.

 

[sretalla]

Can this be actually one on single disks without moving data, since I use RAIDZ2? I can test it out after I copy the data.

There is a non-destructive mode in badblocks, but you'll have to take your own chances on trusting that to really not destroy anything.

I would take it offline and replace with itself after the tests.