new drive reporting with old age and pre-fail


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Had a parity drive aging and reporting sector re-allocation, therefore, I purchased a new drive to replace it.


Went with a black friday 8TB, I ran a preclear on it and everything checked out OK, so yesterday I installed it into the system and began the data re-build process.


Re-built is going fine, but when I look at the SMART data of the drive, it is reporting pre-fail and old age.  Is this normal or should I replace the drive with another?  Since the power on hours are accurate it does not seem to be reporting old data, so before getting too far into it, I can cancel the re-build, replace the drive with a second one I purchased and see if it reports any better.


Below is the SMART data I am looking at.  Thanks


# Attribute Name Flag Value Worst Threshold Type Updated Failed Raw Value
1 Raw read error rate 0x000b 100 100 016 Pre-fail Always Never 0
2 Throughput performance 0x0005 134 134 054 Pre-fail Offline Never 104
3 Spin up time 0x0007 100 100 024 Pre-fail Always Never 0
4 Start stop count 0x0012 100 100 000 Old age Always Never 5
5 Reallocated sector count 0x0033 100 100 005 Pre-fail Always Never 0
7 Seek error rate 0x000b 100 100 067 Pre-fail Always Never 0
8 Seek time performance 0x0005 128 128 020 Pre-fail Offline Never 18
9 Power on hours 0x0012 100 100 000 Old age Always Never 67 (2d, 19h)
10 Spin retry count 0x0013 100 100 060 Pre-fail Always Never 0
12 Power cycle count 0x0032 100 100 000 Old age Always Never 5
22 Unknown attribute 0x0023 100 100 025 Pre-fail Always Never 100
192 Power-off retract count 0x0032 100 100 000 Old age Always Never 33
193 Load cycle count 0x0012 100 100 000 Old age Always Never 33
194 Temperature celsius 0x0002 222 222 000 Old age Always Never 27 (min/max 22/42)
196 Reallocated event count 0x0032 100 100 000 Old age Always Never 0
197 Current pending sector 0x0022 100 100 000 Old age Always Never 0
198 Offline uncorrectable 0x0008 100 100 000 Old age Offline Never 0
199 UDMA CRC error count 0x000a 200 200 000 Old age Always Never 0
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The text "Pre-fail" and "Old age" are just descriptions of what the different attributes are measuring.


Edit - notice that you also have a column "Failed". All your attributes have the value "Never".

If you had seen a "Now" there, then you would have known that the disk considers that specific attribute to be currently failing.


There are a few of the Raw values that you want to stay at zero permanently. You don't want Attribute 5 (Reallocated sector count), 196 (Reallocated event count), 197 (Current pending sector) or 198 (Offline uncorrectable) to tick up because then you have problems with the drive.


And ifh 199 (UDMA CRC error count) is ticking up, then you have issues with the SATA cable or possibly with the electronics in the controller card or the disk.


The disk itself gives an indication what it likes the different values based on the colum "Value". Compare this value with the other column "Threshold" - it's a failure for any attribute to have the "Value" drop down all the way to the "Threshold" value.

Edited by pwm
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oh goodness, I totally misunderstood what they were telling me.  At least I know the parity drive I replaced did have some 1400 reallocated sectors, so it was definitely going bad.  This one, as you note looks good and healthy.  I guess it is time to carry on, thank you for debunking my fears.

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  • 2 years later...

Actually, I have been thinking the exact same for a while.  I couldn't figure out why all my drives were in "pre-fail" state or old, even brand new ones.


This is a dead topic, but I am resurrecting it to suggest maybe a slight change in wording.  Maybe the header could say "Metric of:"


My biggest complaint of Unraid is that in the GUI the available options are often cryptic and un-intuitive.  "Cache: Prefer" has a totally different behavior than expected.


Shares are "Private" or "Secure" which has little to do with 'Private' and I think its more 'Secure' than "Secure"

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