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Forum Discussion
One drive initially marked as failed, Resync now at 6.3% after 12 hours. What next? ReadyNAS Ultra 4
Decided to do some housekeeping and was deleting files from the Ultra 4 when I checked Frontview and found that one of the drives had been marked as having failed. I immediately shut down the NAS using the Frontview command. I then unplugged it from the mains and ethernet.
When I turned it back on to back up important files it performed a file system check and then imediately started a Resync. Disk 4, previously marked as Failed, is now marked as "Resync" under the status, and checking the SMART status for all of the drives shows 0 reallocated sectors, and no other errors. The SMART status of disk 4 is nearly identical to that of the other three. This is all with the original four disks, I had not yet swapped out disk 4.
I began transferring some of the important files over to other external backup drives, but the transfer speed is incredibly slow (estimated to take 3 days to copy 250GB), and I suspect this is due to the active Resync being performed. I have 4x 2TB drives in the NAS, and the Resync is at 6.3 % complete after more than 12 hours (would take ~8 days to complete at this point). I have turned off all the active services to speed things up as much as possible, and have two replacement disks ready to swap in. The unit and all original disks are from 2010, with about 45,000 power-on hours.
My main goal is to protect the data on the NAS. Much of the data, but not all, is also stored in other places, but not enough redundancy that I would be comfortable with a factory reset.
My questions:
- Do you think Disk 4 has actually failed? If the drive has failed, then is there any point in letting the Resync process continue?
- Is there a risk to letting Resync continue, finding bad sectors across multiple disks, and having the entire array fail?
- What would be the best way to proceed with backing up the data with the active Resync process?
- Should I let Resync continue, or somehow try to stop it to perform a quicker backup? (And how would I stop it?)
Even if the Resync process completes and says all is good, and the SMART status for Disk 4 shows green, I'm leaning toward replacing it, which would mean it would have to go through the whole Resync process all over again.
7 Replies
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What stats are you seeing on disk 4 - particularly pending sectors, reallocated sectors, and ATA timeouts?
Are stats getting worse for any drive while the resync is proceeding?
Thank you for your quick response!
Here are the stats from Drive 4 (very similar to the others)
SMART Attribute Spin Up Time 0 Start Stop Count 3453 Reallocated Sector Count 0 Power On Hours 45055 Spin Retry Count 0 Power Cycle Count 315 Runtime Bad Block 0 End-to-End Error 0 Reported Uncorrect 0 Command Timeout 3 High Fly Writes 0 Airflow Temperature Cel 31 G-Sense Error Rate 0 Power-Off Retract Count 11 Load Cycle Count 3454 Temperature Celsius 31 Current Pending Sector 0 Offline Uncorrectable 0 UDMA CRC Error Count 0 Head Flying Hours 64265595669968 Total LBAs Written 412058933 Total LBAs Read 3157320595 ATA Error Count 0 No real changes that I see occuring for any of the disks.
Thanks again.
The only possible concern in the stats would be the command timeouts - and if they aren't increasing they aren't happening now.
Completion estimates for resync on the ultra/pro are often way off, but it should be farther along than 6% by now.
I think I'd let it complete if you can stand the poor performance.
You could of course pull drive 4, and the resync would stop. But I'd be more inclined to do that if we were seeing clear evidence that the drive was getting worse - and we aren't.
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