Preclear Not Successful - non zero values

[bnevets27]

I'm having some trouble getting my drives to preclear successfully. My drives are returing non zero values on post-read.

 

Firstly I have run memtest for 24hrs and the drives don't have an issues with reallocated sectors. My server specs can be foundhere.

 

The oddity is one of the drives I ran 5 times (1 pass each time) and it enventualy passed successfully on the fifth try. I just ran 5 more drives. I ran 3 at once, all failed. Ran the final 2 and they both passed. These drives are split over the two controllers, with one being plugged directly into the motherboard.

 

Date - Failed/Passed returning zero value

 

1 - (4TB Seagate)(Controller 2)

21/01 - Failed

30/01 - Passed

 

2 -  (4TB WD Red) (Onboard controller)

21/01 - Passed

11/02 - Passed

 

3 - (1TB Samsung)(Controller 2)

21/01 - Failed

23/01 - Failed

30/01 - Failed

05/02 - Failed

08/02 - Passed

 

4 - (4TB WD Green)(Controller 2)

11/02 - Failed

 

5 - (4TB WD Green)(Controller 1)

11/02 - Failed

 

6 - (4TB WD Green)(Controller 1)

11/02 - Failed

 

7 - (4TB WD Green)(Controller 1)

11/02 - Passed

 

8 - (2TB WD Black)(Controller 1)

11/02 - Not run yet

 

On drive 3 I think I tried a different cable with no change and went back to the original but still failed.

 

 

All WD drives were ran through garycase's test routine with no failures:

With Data Lifeguard I run a Quick test; then an extended test; then a full write zeroes; then repeat the quick & extended tests.   

Then I run one pre-clear cycle so the drive's ready to add without any need for UnRAID to clear it.

 

Any ideas?

I can post more details later if its helpful.

[bnevets27]

Well the WD black precleared fine on the first run. 

 

Tried to do just a post read on one of the greens that had previously failed and it failed again. 

 

Suggestions?

 

[garycase]

Try the drives that failed on your onboard controller ... you can run several at once if you want.

 

[bnevets27]

I've done so many tests now my head is spinning.

 

garycase, I had actually tried that but tried it again and sure enough the drives don't fail on the on onboard controller. Now one of my problems I was/am having is that since the drives failing to return zero's isn't consistent I have been having a hard time getting good troubleshooting info.

 

I had to change my test routine. I've now been using a batch of 250GB drives. Here's what I've tested thus far.

 

I removed all of the ram and tested one set of 4 in another machine for 24hrs/8 passes, no errors. That same memory was then tested again in the server for another 24hrs/ 8 passes. No errors.

 

All drive tests from here on were post-read-verify only with the fast post read switch.

 

I ran 5 drives all connected to aoc-sata2-mv8 , 3 passed, two failed.

 

I ran 5 drives all connected to onboard controller, all passed. (Suspected could be the card)

 

Moved the aoc-sata2-mv8 card to another machine setup for testing.

I ran 5 drives all connected to aoc-sata2-mv8 , all passed.

 

Moved aoc-sata2-mv8 back to the server, and removed the second aoc-sata2-mv8, so now only one aoc-sata2-mv8 is plugged in.

I ran 4 drives all connected to aoc-sata2-mv8 , all passed.

 

Reinstalled the second aoc-sata2-mv8.

I ran 4 drives connected to the first aoc-sata2-mv8, and 4 drives connected to the second aoc-sata2-mv8 , all passed. (Everything looks to be working. rerun to confirm)

Reran same config as above.

Some/most drives failed (Can't remember the exactly, forgot to take a screen capture)

 

Added a few more drives for 12 in total. 6 on each controller.

Now all drives fail.

 

I've hooked up a meter and monitored my voltages going to my backplane and they seem fine, had the meter monitoring and didn't drop bellow these values. 12v = 12.01v and 5v = 4.9v (there's a little voltage drop over the cables as the voltage is a little higher right off the PSU)

 

 

I've spent weeks now trying to figure out whats going on. I'm at a loss. Should I forget about not getting zero's back and move on? Is that wise??

 

EDIT:

 

Ran with 6 drives attached to one aoc-sata2-mv8. All drives passed.

Ran with 6 drives attached to the other aoc-sata2-mv8. All drives passed.

 

Ran with all 12 drives attached. 3 Failed

 

Ran with:

6 drives attached to one aoc-sata2-mv8

and

1 drive attached to the other aoc-sata2-mv8

and

5 drives connected to the on board controller.

All passed

 

Ran the above test again all passed a second time.

 

 

Ran with 8 drives attached to one of the aoc-sata2-mv8 - all passed

Re-ran the above test - all passed

 

Ran with

8 drives attached to one aoc-sata2-mv8

and

4 drives connected to the on board controller.

All passed.

 

Ran with

4 drives attached to one aoc-sata2-mv8

and

4 drive attached to the other aoc-sata2-mv8

1 drive failed

 

Ran with

7 drives attached to one aoc-sata2-mv8

and

3 drive attached to the other aoc-sata2-mv8

3 drives failed