Jump to content
z0ki

10TB WD Red Pre-Clear?

9 posts in this topic Last Reply

Recommended Posts

I understand that it is not 100% necessery to Pre-Clear brand new drives but it does come recommended to find early life mortality. But I am wondering does this also apply to the 10TB WD RED NAS drives? If so roughly how long would that take? 

 

I am thinking I should do it, but i've also never in my life had a WD drive fail on me but then also things can happen when you least expect it. 

Share this post


Link to post

10TB ~ 20hrs.

I won't preclear no matter its size, just because when add it to pool, whole disk will read and write. Besides, I have 2 parity + backup.

 

I never got new disk DOA but different brand / model have record disk failure.

Share this post


Link to post

Fair call. I don't have a Parity disk setup yet, I am going to get another 10TB in a couple of weeks, then soon after get another 10TB for my Parity disk. 

 

I decided i'll just do the Pre-Clear I thought being new to unRaid it'll be good to do things to familiar myself with the unRaid system and how things work. It's chugging along at around 206MB/s right now. AT least it'll give me a rough idea on what to expect if I do another pre-clear in future. 

Share this post


Link to post

I just had a 12TB wed fail on second cycle of preclear and had to RMA the drive.

 

I had 4 x 10TB pass 3 cycles with no issue.  

 

Truly up to you and your fault tolerance.

Share this post


Link to post

Did you do the entire pre-clear twice? Is it possible a pre-clear can be the cause of drive failure due to the extra continuous strain it's putting on the drive for days at a time?

Share this post


Link to post
Posted (edited)

WD Reds are designed for continuous use. I too have had a WD Red 8Tb be RMAd on first use. The SMART stats showed terrible issues.

 

Decide how important it is for you to have the array available because if you just throw the untested drive in, write to it and then discover it was bad, you may have array downtime while the issue is fixed, especially if you did not have Parity yet.

 

I would agree with the preclear test times of about 20 hours as my 8Tb Reds take 17h30 for a parity check.

Edited by DanielCoffey

Share this post


Link to post
WD Reds are designed for continuous use. I too have had a WD Red 8Tb be RMAd on first use. The SMART stats showed terrible issues.
 
Decide how important it is for you to have the array available because if you just throw the untested drive in, write to it and then discover it was bad, you may have array downtime while the issue is fixed, especially if you did not have Parity yet.
 
I would agree with the preclear test times of about 20 hours as my 8Tb Reds take 17h30 for a parity check.


Agreed Daniel. This is why I decided to take the pre-clearing route.

Once I get another two 10TB drives (I’ll pre-clear those too) I’m guessing I can add another 10TB for data, then add a 10TB after to build parity. Will this be okay?

Share this post


Link to post

Yes it will. Parity has to match or exceed the largest data drive, so a 10Tb Parity would be the smallest you should use.

Share this post


Link to post

My suggestion... go with the biggest drive you can afford for your parity.  If you can afford a 12TB or 14TB than do it, it will allow you to do upgrade your data disks in the future without having to replace with a bigger parity drive.

 

Thats what I did.  Prime day had a solid deal on 12TB reds, but not great.  So I got 1 and now I can upgrade by 10 TBs in the future when the price/GB ratio is a little more palatable. 

 

Good luck!

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.