This drive is not obviously dead, but there is one thing I would investigate before trusting it with important data.

Your WD10EZEX

AttributeResultAssessment
Reallocated sectors0Excellent
Pending sectors0Excellent
Offline uncorrectable0Excellent
Reallocation events0Excellent
UDMA CRC errors0Excellent
SMART error logNo errorsGood
Temperature31°CExcellent
Power-on hours46,918 hHigh, ~5.35 years
Start/stop5,881Fine
Power cycles2,567Fine
Reported uncorrectable725,863Needs investigation

The concerning part: 187 Reported_Uncorrect

You have:

187 Reported_Uncorrect    ... RAW_VALUE 725863

That’s a very large raw value. The normalized value is currently 100, but the WORST value is 1, which is unusual and worth taking seriously.

However, your other important sector attributes are all clean:

5   Reallocated_Sector_Ct     0
196 Reallocated_Event_Count   0
197 Current_Pending_Sector    0
198 Offline_Uncorrectable     0

So I wouldn’t declare the disk bad based on attribute 187 alone. WD’s raw SMART values aren’t always directly interpretable as a simple “number of bad sectors.”

More importantly: your long test hasn’t actually completed

This:

# 2 Extended offline  Interrupted (host reset) 90%

means the test was started but the machine/drive was reset while it was running. 90% remaining means it barely got started.

Your short test passed, but a short test doesn’t scan the entire platter.

Run this now

On your Proxmox host:

smartctl -t long /dev/sda

It says the test takes approximately 114 minutes.

Don’t reboot the server during the test.

After ~2 hours:

smartctl -a /dev/sda

Then look for:

SMART Self-test log

You want:

Extended offline    Completed without error

and preferably:

LBA_of_first_error    -

Also run this

After the long test:

smartctl -x /dev/sda

Paste that output too if you want me to assess it completely.

My current verdict: the 46,918 hours alone doesn’t scare me. The zero reallocated/pending/uncorrectable sectors and 31°C temperature are very good. But the 187 value means I would not yet trust this disk with your only copy of anything important until the full extended test completes.