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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 from the data I see and understand the RAID-system is found healthy so far. I have now run the disk test for about 30 hours. During the disk test I put the fan on "cool" and keep the CPU temp < 50C.
A couple of days before starting the procedure I did a partial scrub in the RAID-1 system but after 10% work and 10 hours operation I decided to stop the scrub. Both disks on the RAID are completely health, anyway, what I can see.
Some facts about the RAID1-disks. It is an odd couple. Both are WD and running on 5400 rpm. The old disk is 4 TB and 64 GB cache. The relatively new disk is 8 TB 256 GB cache. (And I am in the process of exchanging the old 4 TB disk to WD Red Plus 8 TB 256 GB cache running at 7200 rpm, since WD discontinued the 8 TB model I bought about a year ago).
How long should I let the disk test go on?
Something I can check to understand that the test disk process is running well?
(And I have done the procedure to back up everything and also the very new disk about to be used has successfully passed the disk test that took 15 hours. )
Appreciate your advice
Model RN314, latest firmware 6.10.5 hotfix 1
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!
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janpeter1 wrote:
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 from the data I see and understand the RAID-system is found healthy so far. I have now run the disk test for about 30 hours. During the disk test I put the fan on "cool" and keep the CPU temp < 50C.How long should I let the disk test go on?I'd let it complete, since it does sound like there could be an issue, and if a disk is causing the problem then it should be replaced first.
janpeter1 wrote:
How long should I let the disk test go on?Something I can check to understand that the test disk process is running well?You could check the log page (chosing both disk and volume as filters).
If ssh is enabled, you could also try smartctl -x /dev/sda and smartctl -x /dev/sdb
Hi agaain,
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
The RAID-1 had only 10% left now (of the 4TB) and high time to upgrade the 4TB disk.
After the test the overview showed the RAID-1 still as healthy
And in Perfromance view hoovering over the green knobs for each disk
I see that there an no error in any of the two disks.
Downloaded the System_log that contains a lot. I guess the file disk_info.log is of main interest.
That file shows also no errors. Here is a btrfs.log that is not too long but does not seem
to contain something worrisome. Cannot find a date here though.
I do tno think I have ssh-enabled. Many years ago on other computers I used ssh and no it is powerful tool.
Have rudimentrary Linux skills and could manage simple check ups if needed.
But what I see make me less worried now. Still the very long disk test bring questiona marks also for you, right?
One reason might be that the disk was that full, or? Still I though the disk test was without concern of what was on the disk.
Another reason for the long time might be that has been a poorly matched RAID-1 pair of disk, but not sure.
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.
Thanks!
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.
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