Alarm in NetGear CP admin (relocated sector)

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AnishaA wrote:

 

ATA Error Count: 0
Reallocated Sectors: 0
Reallocation Events: 0
Spin Retry Count: 0

 

Check for these four and if this count exceeds more than 0 then we suggest you replace that disk.

 

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makkistyle:  FWIW, I think 0 is too low a threshold.  Personally if I see steadily increasing counts for reallocated sectors, or if I see it exceed about 25 or so, I'll replace the disk. Another indicator is when I am experiencing poor performance, failed transfers, etc.  There is no definitive answer on this, different folks have different thresholds on when a disk needs replacing.

One thing I would like to point out - Backup is the best way to keep your data safe.  If you don't have a backup plan in place for your data, then you should set one up.  With solid backups, disk errors are a nuisance and not a disaster.  The forum community can help with setting up a good backup plan.  

If you are using RAID-0, then you should back up all your data immediately. Everything on the volume will be lost if the disk fails. And everything will be lost when you replace the disk.

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makkistyle wrote:

 

• Health data
  Reallocated Sectors: 2768
  Reallocation Events: 2768

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Though people do have different criteria for replacement, this particular disk should definitely be replaced.

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makkistyle wrote:

there is no way we can tell which one is fault ? as I have two disks 

 

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One thing I suggest is regularly running the disk test, from the volume settings wheel.

If you have two volumes, then run the test on both of them.  This test will take a while, but there will be an entry on the log page when it completes.  Note you can schedule these tests (using the volume schedule).  I run one maintenance function per month (so the disk test runs every 4 months).

Once the test is complete, then you can look at the stats again.

As far as identifying the disk - this can sometimes be tricky. While some of the logs identify the first disk as 1, there are some spots where it is identifed as 0.  Look in disk_info.log - the disk in the first bay is listed as "channel 0", the next bay is "channel 1".  You can double-check by noting the serial number.  Then power down the NAS, remove the disk, and check the serial number.  (Put the disk back while the NAS is powered down).