ReadyNAS Ultra 4 extremely slow replacing disk

[whartonw]

Firmware RAIDiator 4.2.31

Increasing capacity by changing out one disk at the time, going from four 2-TB disks to four 3-TB disks.

Estimated time to resync first disk is 350+ hours?!!!  At this rate, it'll take a month to replace the four disks.

Can this be right?

[StephenB · Accepted solution]

The estimate is often way off, it should complete within 24 hours.

If you are upgrading all four disks, it usually is faster to back up the data, do a factory reset with all the new disks in place, and then restore the data from the backup.

[StephenB · Accepted solution]

The estimate is often way off, it should complete within 24 hours.

If you are upgrading all four disks, it usually is faster to back up the data, do a factory reset with all the new disks in place, and then restore the data from the backup.

[whartonw]

Thanks, Stephen, for your quick, and anxiety-reducing, reply.  You, of course, were correct.

My panic started when the job was 3% done after 10 hours.  FYI, turns out there was a backup job running that must have been eating up resources; I stopped the backup, and the re-sync completed in your predicted 24 hours total.

Thanks for your suggestion re:  replacing all four disks at once.  My problem is that the Ultra 4 is my backup device, and I don't have anything with sufficient capacity to back it up.  Thus the one-at-a-time method.

Your presence on the forum is a real service to the community.  Thank you for your committment.