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Forum Discussion
Disk test will not stop.
I have a ReadyNas 516 with 6 8TB drives. I started getting errors on the Raid-5 volume with one of the drives started having ATA errors... Disk: Detected increasing reallocated sector count: [333...
Seagate disks model ST8000DM004-2CX188. This is the only ReadyNas that has 8TB drives. The 2 others have 16TB and 20TB drives, all Seagate.
The 2 other 516 ReadyNAS boxes and I have tried disk tests in the past and it seems like they have taken less than a day to complete.
This disk test started all on its own after a drive replacement. Other 516's I was doing disk tests on had previous versions of the software. With no more support from Netgear and no more updates to ReadyNas software, I will never do another disk test again if this one took 2 months to complete.
It seems like Netgear is wanting everyone to trash their ReadyNas boxes and buy new ones. If this is the case, I'll find another hardware company.
Seagate disks model ST8000DM004-2CX188
These are SMR drives, so not a great choice for NAS. That might factor into the test time. Sustained write performance of SMR drives is very slow (and requires a lot of disk activity). That is because writing to track X trashes track X+1. So the drive has to "ripple"
- Read track X+1
- Write Track X
- Read Track X+2
- Write Track X+1
- ...
until the "ripple" reaches the end of the SMR zone. The manufacturers do increase cache and re-order writes to minimize the impact of SMR - but anything that does much writes (including resyncing) will be much slower than a conventional (CMR) drive.
Generally I recommend NAS-purposed (for example, Ironwolf or WD Red Plus) drives or enterprise-class drives for NAS. Desktop-class mechanical drive models are shifting to SMR, as primary PC drives have transitioned to NVMe
I will never do another disk test again if this one took 2 months to complete.
The test is done with a standard linux tool (smartctl). Your particular symptom is more likely to be one of the drives and not the NAS. The long time indicates that at least one drive was struggling.
So not running the test is not the best response.
It seems like Netgear is wanting everyone to trash their ReadyNas boxes and buy new ones.
Hopefully you know that Netgear has exited their NAS business. All ReadyNAS products are end-of-life.
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