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4TB to 6TB HDD Replacement: Data Degraded?
I'm upgrading the storage on my RN314. After installing a new 6TB HDD in an empty slot two days ago, I've got the following drives in the following bays:
1. 4TB
2. 4TB
3. 4TB
4. 6TB
Per the instructions on this page, I removed the 4TB HDD from bay 1. in anticipation of replacing it with a 6TB HDD later today. Almost as soon as I did so, "DATA DEGRADED" began flashing on the LED screen of the unit.
The logs say:
Thu Dec 10 2015 8:44:42
Volume: Resyncing started for Volume data.
Thu Dec 10 2015 8:44:44
Volume: Volume data health changed from Redundant to Degraded.
Thu Dec 10 2015 8:44:50
Disk: Disk Model:WDC WD40EFRX-68WT0N0 Serial:WD-WCC4EKXDN8ZP was removed from Channel 1 of the head unit.
Thu Dec 10 2015 8:44:57
Volume: The resync operation finished on volume data. However, the volume is still degraded.
What does this mean (other than the obvious lack of redundancy), and what will happen if I insert the new 6TB HDD in bay 1. when it's in the "degraded" state? Will it resync and then become redundant?
The volume is degraded because you removed the disk. What that means is that the volume can not recover from another disk failure. That is completely expected behaviour. XRAID with single redundancy can only protect against loss of one disk - and when you removed the drive, you lost one.
When you insert the new disk, it will add it to array, and redundancy will be restored after the resync. After that, the NAS should prompt you to reboot. After the reboot, the volume should expand by 2 TB.
The process will take a while - I don't have a good estimate, but my guess is 12 hours to restore redundancy. Expansion will be quicker.
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The volume is degraded because you removed the disk. What that means is that the volume can not recover from another disk failure. That is completely expected behaviour. XRAID with single redundancy can only protect against loss of one disk - and when you removed the drive, you lost one.
When you insert the new disk, it will add it to array, and redundancy will be restored after the resync. After that, the NAS should prompt you to reboot. After the reboot, the volume should expand by 2 TB.
The process will take a while - I don't have a good estimate, but my guess is 12 hours to restore redundancy. Expansion will be quicker.
Rock on. That's exactly what I wanted to know. Thanks so much for your clear and speedy reply.
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