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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:
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.
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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