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janpeter1's avatar
janpeter1
Luminary
Oct 13, 2021
Solved

Disk test of RAID-1 takes more than 30 hours - something wrong?

Hi   I am in the process of upgrading my RAID1-disk pair on RN314 system. Before change one of the disks I do "Disk test" from the NAS. It takes very long time and makes me a bit worried, although...
  • janpeter1's avatar
    janpeter1
    Oct 19, 2021

    I just want to repor that the final resync of "empty" last half of the 8TB was completed without any problem. All disks are ok. Took 26 hours the last part.

     

    The somewhat long time is partly due to regular but small time machine backup from one computer that I did not turn that off during resync. That backup was however done to another disk on the same NAS but took likely some CPU resources.

     

    Thanks for your helpful support!

StephenB's avatar
StephenB
Guru - Experienced User
Oct 14, 2021
janpeter1 wrote:

 

Can you say something about the noise level of 7200 rpm compared to 5400 rpm disks?

Noticeable, when you have just a RAID-1?

 

WD80EFBX: 27 dBA Idle/29 dBA Seek

WD80EFAX:  27 dBA Idle/29 dBA Seek

 

WD40EFRX: 25 dBA Idle/28 dBA Seek.

 

So the WD80EFBX model has the same noise spec as the WD80EFAX you already have - and a very slight increase in the noise spec over the WD40EFRX. 

 

Note the WD80EFAX you already have is 7200 rpm, not 5400.  There is a footnote in the datasheet ( https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-red-plus-hdd/product-brief-western-digital-wd-red-plus-hdd.pdf ): Actual Spindle Motor Rotational Speed for this model is 7200 RPM; though ID Device may report 5400 to reflect previous Performance Class designation.

 

Not sure what to make of that.  There is some press on it here https://www.extremetech.com/extreme/317327-western-digital-changes-its-reported-drive-speeds-to-reflect-reality

janpeter1's avatar
janpeter1
Luminary
Oct 14, 2021

Interesting! Means I may relax and wait a bit to replace my third 4 TB disk. But, cast some shadow over WD sort of. / Jan Peter

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