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Luminary

Dec 15, 2015

Reallocated Sector Count on new drive

Hi all,

Recently I swapped one of my 4 drives (X-RAID 2 dual redundancy) on my Readynas Pro 6 proactively as I wanted to eventually get into a position where 2 of these disks are a different age. They are the same model (I had some spares from 3 years ago).

I installed the disk on 28th Nov, it re-sycned successfully. I now have noticed that on 3rd December I got 1 reallocated sector and then on 8th a further 2, so now I have 3 reallocated sectors. I was surprised I got no e-mail alert or log for this, you used to on the NV+.

Today as we speak there is another disk syncing since I swapped the second of the 2 planned proactive swaps but I am concerned about the disk I swapped on 28th November. I know some may think I'm being paranoid but the other disks have 0 reallocated sectors and they've been running 3 years.

Am I right to say this is considered normal and providing they don't continue to increase, there is no cause for alarm?

Thanks...

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11 Replies

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cpu8088
Virtuoso
Dec 15, 2015
not a concern if you have backup

redundancy from raid is not a backup

as long as the number is not increasing there is no prob
- steveoelliott
  Luminary
  Dec 15, 2015
  Backups are taken daily...
  
  It supports a business so even with a backup in the event of the system being unavailable there would be serious impact. There is another NAS acting as a mirror but still it would require my intervention and time to bring it online.
  
  I know I'm probably being paranoid here as even the drive failure should not result in the system being down since it has dual redundancy.
  
  It's just disapointing to have reallocated sectors on a brand new drive... Will keep an eye and if it goes up much more, I'll replace it again.
  - cpu8088
    Virtuoso
    Dec 15, 2015
    newly manufactured drives are different from a never used drive manufactured 2 years ago.
    
    even if you dont use the drive the platter may deteriorate. just like a car will go rusty even if you dont drive it but park in garage for 2 years. :-)