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Increasing reallocated sectors count: how to check hardware
Hello! My ReadyNAS have detected massive increasing amount of reallocated sectors at one of 2 my mirrored HDDs. I pulled the HDD out to run some tests. S.M.A.R.T analysis detected reallocated sector...
gpn12buy wrote:
But further surface tests did not find any problems,
Did you do the destructive write test, or only read tests? I've had drives which pass the read tests, but which fail on the write-zeros test.
It's hard to envision a failure mode of the bay that would cause the drive to increase its reallocated sector count.
gpn12buy wrote:
But further surface tests did not find any problems,
Did you do the destructive write test, or only read tests? I've had drives which pass the read tests, but which fail on the write-zeros test.
It's hard to envision a failure mode of the bay that would cause the drive to increase its reallocated sector count.
Hello, Stephen. Thank you for the reply. I haven't tried write tests yet and I understand that the most probable cause of those errors is HDD. I have no option to backup my data due to some reasons. This is the primary concern for not taking anything destructive. So, is it ok to swap HDDs in bays as the first step?
gpn12buy wrote:
I have no option to backup my data due to some reasons. This is the primary concern for not taking anything destructive. So, is it ok to swap HDDs in bays as the first step?
Without a backup, you do risk data loss if a second drive fails.
I wouldn't swap the HDDs around. Though I don't see any way it can be the bay, if I am wrong you'd simply damage another different hard drive. That could end up being destructive.
The next step is to replace the disk.
Sector re-allocation is entirely internal to the HDD. Nothing in the NAS can cause it. Command time-outs, on the other hand, can be the result of something odd in the NAS (and SMART.will detect and store them).
I have had a couple similar drives where manufacturer's tools said that the drive was OK but the NAS did not like it. In every case, return to the NAS resulted in more errors. I have wondered if the drive orientation might be a factor, as my USB dock has a different orientation than the NAS. But a drive with problems in one orientation and not in another is still a drive with problems that needs replacement.
StephenB wrote:
gpn12buy wrote:But further surface tests did not find any problems,
Did you do the destructive write test, or only read tests? I've had drives which pass the read tests, but which fail on the write-zeros test.
It's hard to envision a failure mode of the bay that would cause the drive to increase its reallocated sector count.
Hello, Stephen. You were completely right. I managed to back my data up and proceeded with further tests. HDD did successfully pass read tests (again!) with nice clean SMART after that. But it failed succeeded write tests showing me 5K+ reallocated sectors:-) The reason is obviously HDD, just like you said. Thank you for help!
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