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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...
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!
janpeter1 wrote:
The disk test completed after 33 hours and 3 min (on my RND314 bought 2015).
The two disk are
- WD 4 TB - 64 MB cache - 5400 rpm - WD40EFRX - bought 2015 August
- WD 8 TB - 256 MB cache - 5400 rpm - WD80EFAX - bought 2021 February
Still the very long disk test brings question marks also for you, right?
My RN524 with 4 WD80EFAX drives completes the disk test in about 21 hours. I'd expected the RN314 to complete more quickly, especially with fewer disks. But the test is run in the background, so the running time would depend on what else the NAS is doing.
janpeter1 wrote:
I wait for your response, before I exchange the 4 TB disk to the newly bought and tested 8TB WD80EFBX disk (7200 rpm though).
And I plant to do that echange of disk as a hot-swap, based on earlier recommendations here on the forum.
... And I have done the procedure to back up everything
Since you have an up to date backup, it is safe to proceed. I agree hot-swapping is the right method.
Hi again,
I have moved the new disk to the RAID-1 (after DESTROYING the temporary volume I made for test purpose on the new disk).
The resync goes on and now after about 2 percen done the time estimate seems to stabilize around 15 hours. Seems ok.
The fan is also turned up to "Cool".
The NAS does not do much this week, but occasionally do incremental backup of my or my wifes Macs.
So the work-load I do not think explain the long time to do Disk test.
For Netgear it would be good if they could include a progress bar in Disk test as they have for Resync.
At least you see that something happens and there is some progress, and at a later stage i guess the reamining time estimate
becomes rather good.
Within a few months I think I will buy another 7200 rpm disk so RAID-1 have the same disks.
The 5400 rpm disk I will have use for to take backups for our Macs here.
Can you say something about the noise level of 7200 rpm compared to 5400 rpm disks?
Noticeable, when you have just a RAID-1?
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
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
Hi,
The Resyn process of the RAID-1 has come to a point where it changed from Degraded to Redundatn. It took 16 hours instead fo 15 which as an early estimate that I made from a number of such such estimates coming up with large spread. I think it is good.
What suprise me is that in now continue to Resync remaining 4 TB.
it takes another 15 hours or so I guess. And here is what I understand no material of interesst. Remember that before I had 8 TB + 4 TB and now I have 8 TB + 8 TB.
I would appreaciate some brief explanation of why this last part of Resync is needed.
Or if have done something wrong, some information not given, or so?
But I have no problem to just let it go on.
janpeter1 wrote:
Remember that before I had 8 TB + 4 TB and now I have 8 TB + 8 TB.
I would appreciate some brief explanation of why this last part of Resync is needed.
When you had 8TB+4TB, your system had a single 4 TB RAID-1 group (using both disks). The remaining 4 TB on your 8 TB disk wasn't used at all.
When you upgraded the 4 TB drive, the system creates a second 4 TB RAID-1 group to use the rest of the space. This is concatenated with the first RAID group, so you still have a single 8 TB volume.
But the two RAID groups still both need to be resynced. The first phase is to rebuild the original RAID-1 group (copying data from the original 8 TB drive to the new one). You won't get any more space in this phase.
When that is complete, the second RAID group is created, and that is also synced. That is when you will see the volume expand.
Note that if you ever do a factory default, the system would just create a single 8-TB RAID-1 group. This more complicated process is just used for vertical expansion.
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