SMART Test result?

[airborne spoon]

I was debating between storage and NAS thread and storage made more sense, mods please move if its the wrong place.

 

I just ran my first SMART test on my NAS and 2x drives came up with 1 line that said its all good and the other 2x drives came up with 3 lines saying its all good.

 

Are they all good because i have no idea what all those numbers mean on either test but it says no errors so thats what i take as the biggest thing.

 

ada0 and ada1 is a 10TB WD red 7200 RPM and ada3 and ada4 is a 10TB WD red 5400 RPM the slower drives are about 1 year older than the other 2 but they seem to work just fine together in RAID whatever its called with striped mirror on 4 drives.

 

Also it wasnt setup to run auto tests so i set it to do a weekly short, should i setup a monthly long test? it says it takes up to 10 hr for a long test and i dont want my NAS to be down for that long, my understanding is it takes the NAS offline while it runs the test, please correct me if im wrong.

 

[Alex Atkin UK]

As you can see from the lifetime value (how long the drive had been running in total when the test was run), ada3 is showing previous test results as well as the test you just ran.

Not sure about running regular tests, I certainly do not bother as there are no guarantees SMART will pick up on a fault before its fatal anyway, its only a rough guide for when you "think" a drive is failing.

[LIGISTX]

2 hours ago, airborne spoon said:

my understanding is it takes the NAS offline while it runs the test, please correct me if im wrong.

Smart tests don’t offline the devices. I run weekly shorts and every other week longs on my drives in my truenas array, SMART tests don’t really affect performance…. Technically a long test (I think?) would, but I never notice any issue. Run them at night when your not using the drives. 
 

1 hour ago, Alex Atkin UK said:

Not sure about running regular tests, I certainly do not bother as there are no guarantees SMART will pick up on a fault before its fatal anyway, its only a rough guide for when you "think" a drive is failing.

Sort of… you should run SMART tests because it can only help give you info early on a failing driving. Will it always tell you a drive will fail before it does? No, but can it, yes. I have had many drives start reporting issues via SMART, I bad blocked them, they indeed were failing, and replaced them. This all happened before the drive outright died so I was able to be proactive vs reactive. Again, it won’t always tell you first, but it’s like going on for a yearly physical - the odds of it helping you stay healthy certainly outweighs doing nothing and finding out you do have some fatal illness that “if only we had caught it 6 months sooner”.

 

TLDR; run smart tests because they certainly don’t hurt anything, and can prove helpful. 

[Needfuldoer]

Yup. SMART is the canary in the coal mine.

 

(But that's what we have backups and regularly scheduled ZFS scrubs for, right?)

[LIGISTX]

5 hours ago, Needfuldoer said:

Yup. SMART is the canary in the coal mine.

 

(But that's what we have backups and regularly scheduled ZFS scrubs for, right?)

Scrubs every other week (may even drop down to once a month…. ¯\_(ツ)_/¯) and the important stuff is backed up to the cloud. Good ol backblaze B2. 
 

Hopefully everyone practices good backup techniques.