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Forum Discussion
Replacing failed 3TB disk in ReadyNAS Ultra 6 with 4 TB disk
My ReadyNAS Ultra 6 has a "degraded" volume due to one of the 6 x 3TB drives failing. The drives are all WD Red 3TB (WD Red WD30EFRX) What would be the largest drive I can replace the failed drive w...
Unfortunately, on powering up the NAS today with the intent of removing the failed drive (in slot 4) and letting the system resync, I was presented with a frightening picture under System/Volumes with every drive showing failed. A couple of reboots and everything seemed to come back to where it was yesterday EXCEPT the failed drive was showing in another slot (3). One more reboot and now I've lost everything i.e. 13.62 TB free of 13.62 TB and the system is resyncing having marked disk 3 as Failed.
I think, given the age of the system, I'll order 6 new drives and start again!
jimot wrote:
Unfortunately, on powering up the NAS today with the intent of removing the failed drive (in slot 4) and letting the system resync, I was presented with a frightening picture under System/Volumes with every drive showing failed
Did it show the drives as having failed? Or did it show an inactive volume?
jimot wrote:
One more reboot and now I've lost everything i.e. 13.62 TB free of 13.62 TB and the system is resyncing having marked disk 3 as Failed.
This is unusual - if you like, you can send me a PM with the download link to the full log zip, and I can take a look. The system wouldn't normally delete a volume and recreate it, and it can't resync an existing single-redundancy volume with a failed disk.
It showed the dives as failed.
Unfortunately, the only log entries showing are from yesterday showing -
Disk: Detected increasing ATA error count: [27517] on disk 3 (Internal) [WDC WD30EFRX-68AX9N0, WD-WCC1T0937805] 2 times in the past 30 days. This condition often indicates an impending failure. Be prepared to replace this disk
I removed the offending disk from slot 3 and the NAS is running ok in a degraded state whilst I await the new drive.
Luckily nothing of importance was lost but very strange behavior!
Thanks for your assistance.
I'm also a bit confused that it is still showing 13.61 TB of 13.62 TB - does that mean there is no RAID until the new disk goes in?
Not that I will put much on there until then!
jimot wrote:
I'm also a bit confused that it is still showing 13.61 TB of 13.62 TB - does that mean there is no RAID until the new disk goes in?
It should be showing the same capacity. But I wouldn't worry about something that small.
You certainly have RAID (files wouldn't be accessible if you didn't). But since the volume is degraded, you have no RAID redundancy. So if another disk fails, you will lose your data.
Performance is slower when the volume is degraded. Whenever the data blocks on the missing disk need to be read, the NAS instead has to reconstruct that data from the information on the remaining disks.
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