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RN214 Potential errors and solutions
Hello There, My RN214 has two 6TB & two 4TB drives in a RAID 5 configuration. I was told the 2 6TB drives were bad. I backed everything up and re-formatted both drives and ran Disk Test on them. ...
Thanks for posting the disk info. This is why your helper said the disks needed replacing:
Device: sdb ATA Error Count: 36 Reallocated Sectors: 193 Reallocation Events: 193 Device: sdc Health Data: ATA Error Count: 57 Reallocated Sectors: 176 Reallocation Events: 176
FWIW, I agree with that. I replace disks before the reallocated+pending sector counts reaches 50. Though different folks have different ideas on how many reallocated sectors are ok.
Alexjccim wrote:
- What error count level should I be looking for?
I was thinking looking for any increase in the ATA counts. Though as noted above, I'd replace the 6 TB Ironwolfs, because of the reallocated sectors. Then keep an eye on the 4 TB drive that also has some ATAs. Those might be side effects of disk errors on the main drives.
Alexjccim wrote:How hard is it for me to buy a new one and hot swap them?
It's not difficult to do the swap. You just remove one of the disks with the NAS running, mount the new one into the tray, and reinsert it. Then check to see that the resync has begun. You'd want for the resync to fully complete before swapping the second one.
One caution - your data isn't protected by RAID redundancy during the process. And since you have two disks with bad sectors, the resync might fail (due to errors on the second disk). So it is particularly important for you to have a backup of your data before you do the swap.
Generally speaking, RAID redundancy isn't enough to keep your data safe even when the disks are healthy. So you should begin by putting a backup plan in place. Using USB drives for backup is one approach (usually the least expensive).
Stephen,
I appreciate your help. In response:
StephenB wrote:Have you looked at the disk SMART stats? Download the full zip file, and look in disk_info.log
- Attached
You are seeing errors, so there is some reason for concern. I did have a drive that was causing problems, even though the only error stat was ATA errors.
- Do I need to replace now?
It's hard to say. I suggest watching it for now, and see if the error counts increase.
- What error count level should I be looking for?
Did they tell you why?
- No. They just said it was bad, I needed to replace them. They stopped helping after that .
What model drives do you have (both the 4 TB and the 6 TB ones)?
- Seagate 6TB Ironwolf NAS SATA 6GB/s NCQ 128MB Cache 3.5-Inch Internal Bare/OEM Hard Drive (ST6000VN0041) (2)
- Seagate 4TB IronWolf NAS SATA 6Gb/s NCQ 64MB Cache 3.5-Inch Internal Hard Drive (ST4000VN008) (2)
How hard is it for me to buy a new one and hot swap them?
Thanks,
-Alex
Thanks for posting the disk info. This is why your helper said the disks needed replacing:
Device: sdb ATA Error Count: 36 Reallocated Sectors: 193 Reallocation Events: 193 Device: sdc Health Data: ATA Error Count: 57 Reallocated Sectors: 176 Reallocation Events: 176
FWIW, I agree with that. I replace disks before the reallocated+pending sector counts reaches 50. Though different folks have different ideas on how many reallocated sectors are ok.
Alexjccim wrote:
- What error count level should I be looking for?
I was thinking looking for any increase in the ATA counts. Though as noted above, I'd replace the 6 TB Ironwolfs, because of the reallocated sectors. Then keep an eye on the 4 TB drive that also has some ATAs. Those might be side effects of disk errors on the main drives.
Alexjccim wrote:How hard is it for me to buy a new one and hot swap them?
It's not difficult to do the swap. You just remove one of the disks with the NAS running, mount the new one into the tray, and reinsert it. Then check to see that the resync has begun. You'd want for the resync to fully complete before swapping the second one.
One caution - your data isn't protected by RAID redundancy during the process. And since you have two disks with bad sectors, the resync might fail (due to errors on the second disk). So it is particularly important for you to have a backup of your data before you do the swap.
Generally speaking, RAID redundancy isn't enough to keep your data safe even when the disks are healthy. So you should begin by putting a backup plan in place. Using USB drives for backup is one approach (usually the least expensive).
- Stephen,
Once again, your advice is sage and your explanations are thorough. I will start the hot swaps immediately. Now you see why I was so concerned about the integrity of my USB data when setting up Rsync in the other post.
Thank you,
-AlexStephen,
I want to report that the hot swaps were successful for both drives and the Rsyncs have completed. I appreciate your support and advice.
-Alex
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