muzicman82

SMART+ Errors? What is acceptable?

5 posts in this topic

Hi all,

I have 4x WDC WD2002FAEX drives (identical) in a Netgear ReadyNAS Ultra 4 PLUS. I just got a warning at a reboot today that a couple disks have some SMART reported errors.

Are these things I could get the drives RMA'd for? Or do I have to wade through it until they really fail? Will Western Digital RMA drives with these SMART error reports or will I need to backup the data and then run their tool?

I absolutely cannot lose data on this RAID, so I guess it's time to backup the backup.

Here's what I see:

Raw Read Error Rate	52
Spin Up Time	8000
Start Stop Count	104
Reallocated Sector Count	2
Seek Error Rate	195
Power On Hours	18593
Spin Retry Count	0
Calibration Retry Count	0
Power Cycle Count	78
Power-Off Retract Count	68
Load Cycle Count	35
Temperature Celsius	42
Reallocated Event Count	1
Current Pending Sector	0
Offline Uncorrectable	0
UDMA CRC Error Count	3
Multi Zone Error Rate	6
ATA Error Count	0

Raw Read Error Rate	3
Spin Up Time	8166
Start Stop Count	110
Reallocated Sector Count	0
Seek Error Rate	0
Power On Hours	18591
Spin Retry Count	0
Calibration Retry Count	0
Power Cycle Count	83
Power-Off Retract Count	74
Load Cycle Count	35
Temperature Celsius	44
Reallocated Event Count	0
Current Pending Sector	0
Offline Uncorrectable	0
UDMA CRC Error Count	0
Multi Zone Error Rate	0
ATA Error Count	0

Raw Read Error Rate	0
Spin Up Time	8108
Start Stop Count	108
Reallocated Sector Count	2
Seek Error Rate	196
Power On Hours	18020
Spin Retry Count	0
Calibration Retry Count	0
Power Cycle Count	82
Power-Off Retract Count	73
Load Cycle Count	34
Temperature Celsius	43
Reallocated Event Count	2
Current Pending Sector	0
Offline Uncorrectable	0
UDMA CRC Error Count	0
Multi Zone Error Rate	0
ATA Error Count	0

Raw Read Error Rate	0
Spin Up Time	8000
Start Stop Count	115
Reallocated Sector Count	0
Seek Error Rate	0
Power On Hours	18351
Spin Retry Count	0
Calibration Retry Count	0
Power Cycle Count	89
Power-Off Retract Count	79
Load Cycle Count	35
Temperature Celsius	41
Reallocated Event Count	0
Current Pending Sector	0
Offline Uncorrectable	0
UDMA CRC Error Count	2
Multi Zone Error Rate	1
ATA Error Count	0

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Reallocated sectors are never good, and can be indicative of future drive failure....usually once drives start forming bad sectors they keep doing so.

Make sure you have a backup!!

I'd try to RMA such a drive if it were under warranty, otherwise I'd take it out of service.

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Which errors are flagged specifically?

I think what caused the warning may be the "Raw Read Error Rate" of drive #1? On a WD of mine it start at 0 and the threshold is 51.

There's a bit of "Multi Zone Error Rate", but I don't know if that's critical or what to expect in NAS usage. The threshold is 200 here, so it's nowhere near. There's also "Seek Error Rate" on #1 and #3. Maybe read up on these attributes.

I wouldn't worry much about a few reallocated sectors if it stays stable.

Anyway, won't hurt asking WD directly.

Edited by eshap

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Which errors are flagged specifically?

I think what caused the warning may be the "Raw Read Error Rate" of drive #1? On a WD of mine it start at 0 and the threshold is 51.

There's a bit of "Multi Zone Error Rate", but I don't know if that's critical or what to expect in NAS usage. The threshold is 200 here, so it's nowhere near. There's also "Seek Error Rate" on #1 and #3. Maybe read up on these attributes.

I wouldn't worry much about a few reallocated sectors if it stays stable.

Anyway, won't hurt asking WD directly.

Thanks. Will WD only RMA a drive if their diagnostics tool throws errors? I submitted a case but it has been 3 days with no response. Unfortunately, this being part of a RAID5 array, I would have to shut off the NAS, make a RAW image of the drive using R-Studio or Acronis, and then run diagnostics, and then restore if needed. Given these are each 2TB drives, that's a lot of disk space I need to do this.

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Two of them show reallocated sectors, which should easily get you RMA approval for replacement disks.

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