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Forum Discussion
SMART errors - What do you do?
I got a message from my READYNAS informing me one of the disk is experiencing a SMART event which may point to an impending drive failure. I looked at the SMART table and its basically the 'Current Pe...
The key errors are the "current pending sector" and "offline uncorrectable". "Current Pending sectors" is incremented when the disk can't read a sector. On a write request, the sector would have been reallocated.
17 sectors is probably not high enough for the vendor tools to say the drive is bad. I would plan to replace it anyway - especially if the count suddenly jumped from near-0 up to 17.
If it is under warranty, you would get a refurbished drive. Generally I won't put refurbished drives in my RAID array, I put them somewhere else.
You should probably check the warranty status, as you may only have a 12 month warranty (which would be expired) anyway. If it is under warranty, then do a full diagnostic (read and write tests). The bad sector count will likely go up. Note that the write test would be destructive, so you should probably replace the drive first.
On the load cycle count, I have one WD30EZRX with >785000 load cycles, and it is still working fine. My own experience with green drives [so far] is that the load cycle specs are extremely conservative. However, I no longer put them in RAID arrays, I have replaced them in my primary NAS with WDC Red drives.
(a) is what I would do if it were my drive. Since I have full backups, I might watch it a bit longer. But usually the failure counts rapidly accelerate once they begin climbing into double digits.
A variant of (b) is to run full read/write diagnostics with vendor tools, and then reexamine the SMART stats. Though I wouldn't put it back into the array in any case.
(c) I wouldn't increase the frequencies. Scrubbing in particular will increase the stress on all the drives.
17 sectors is probably not high enough for the vendor tools to say the drive is bad. I would plan to replace it anyway - especially if the count suddenly jumped from near-0 up to 17.
If it is under warranty, you would get a refurbished drive. Generally I won't put refurbished drives in my RAID array, I put them somewhere else.
You should probably check the warranty status, as you may only have a 12 month warranty (which would be expired) anyway. If it is under warranty, then do a full diagnostic (read and write tests). The bad sector count will likely go up. Note that the write test would be destructive, so you should probably replace the drive first.
On the load cycle count, I have one WD30EZRX with >785000 load cycles, and it is still working fine. My own experience with green drives [so far] is that the load cycle specs are extremely conservative. However, I no longer put them in RAID arrays, I have replaced them in my primary NAS with WDC Red drives.
sdchew wrote: ...a) don't mess around and replace the drive
b) pull the drive, low level format it and pop it back.
c) increase the disk scrubbing and volume consistency check frequency to safe guard against data corruption and ignore it until it fails
(a) is what I would do if it were my drive. Since I have full backups, I might watch it a bit longer. But usually the failure counts rapidly accelerate once they begin climbing into double digits.
A variant of (b) is to run full read/write diagnostics with vendor tools, and then reexamine the SMART stats. Though I wouldn't put it back into the array in any case.
(c) I wouldn't increase the frequencies. Scrubbing in particular will increase the stress on all the drives.
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