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Certifying 8 x 16TB Drives. Faster on the 2nd and 3rd Pass?

(@bjayjones)
New Member

After 24 hours of certifying my 8 x 16TB drives simultaneously, the time remaining continues to increase. What began at 70 hours when beginning the certification process is now +130 hours. 

I understand that this process requires time! But will the 2nd and 3rd pass take nearly as long? If so, at this rate, this process may take over a month to complete. Is this to be expected? And is this normal behavior?

I'm running this certification via an OWC Thunderbay 8 (B&H purchase link) over Thunderbolt 3 with 16TB Ironwolf Pro Drives 7200rpm. My Mac Mini specs are attached below. 

Thanks in advance!

Screen Shot 2022 02 20 at 7.51.36 AM
Screen Shot 2022 02 20 at 7.48.02 AM
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Topic starter Posted : 20/02/2022 7:01 am
(@softraid-support)
Member Admin

Certify proceeds at the max speed of the disks. 8 drives will not saturate the Thunderbolt bus, either.

The reason the estimated time varies widely, is we use a simple estimate of current speed vs TB remaining. So as the disk nears the end of pass one, it gets much slower, that is a function of HDD"s, then the second pass will start out fast, and gradually slow down.

16TB drives should take a full week, yes, you are writing/reading 96TB of data.

it is worth it as drives are shipped untested.

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Posted : 20/02/2022 10:28 am
(@bjayjones)
New Member

@softraid-support Thanks for the quick reply. That all makes complete sense, especially at that size!

Should I expect each pass to take a week to complete? Or would all 3 passes collectively take a week? I guess I'm curious if the "time remaining" is estimating the time of each individual pass or all 3 passes together. 

Upon posting this morning, the "time remaining" and jumped up to 160+ hours from the original 130 hours. I'm hoping that estimate decides to level out soon!

Screen Shot 2022 02 20 at 11.33.09 AM

 

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Topic starter Posted : 20/02/2022 10:39 am
(@softraid-support)
Member Admin

@bjayjones 

the estimate is for all remaining passes. Note you are at 15TB. That is the slowest part of the first pass. Then when it starts reading back pass 1, it will show many less hours, which will slowly increase.

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Posted : 20/02/2022 10:41 am
(@bjayjones)
New Member

@softraid-support Excellent. Thanks for the clarification! I appreciate the help. 

ReplyQuote
Topic starter Posted : 20/02/2022 10:45 am
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