From the Western Digital website:
Western Digital manufactures desktop edition hard drives and RAID Edition hard drives. Each type of hard drive is designed to work specifically in either a desktop computer environment or a demanding enterprise environment.
If you install and use a desktop edition hard drive connected to a RAID controller, the drive may not work correctly unless jointly qualified by an enterprise OEM. This is caused by the normal error recovery procedure that a desktop edition hard drive uses.
When an error is found on a desktop edition hard drive, the drive will enter into a deep recovery cycle to attempt to repair the error, recover the data from the problematic area, and then reallocate a dedicated area to replace the problematic area. This process can take up to 2 minutes depending on the severity of the issue. Most RAID controllers allow a very short amount of time for a hard drive to recover from an error. If a hard drive takes too long to complete this process, the drive will be dropped from the RAID array. Most RAID controllers allow from 7 to 15 seconds for error recovery before dropping a hard drive from an array. Western Digital does not recommend installing desktop edition hard drives in an enterprise environment (on a RAID controller).
Western Digital RAID edition hard drives have a feature called TLER (Time Limited Error Recovery) which stops the hard drive from entering into a deep recovery cycle. The hard drive will only spend 7 seconds to attempt to recover. This means that the hard drive will not be dropped from a RAID array. Though TLER is designed for RAID environments, it is fully compatible and will not be detrimental when used in non-RAID environments.
kozchris wrote:Does anyone have the steps to reset the status on a drive so it will go back into the array or do i need to contact QNAP support?
The SMART status is an interpretation of some SMART statistics with fairly liberal tresholds. It's a rather blunt tool, absolutely not able to provide a definitive truth about the disk status.kozchris wrote:Seems like a bug to me that you can't decide to put a disk that appears GOOD back into the raid set easily.
Fantastic machines these Qnaps are, that can still run despite such abuse and awful administration.baten wrote:...so i popped out disc 1 and put in this new disc, and took it back out after a few seconds, it had started rebuilding. then replaced the old disc and it has been okay now for over a month.
The topic of this thread is Disk Read/Write Error. That is not a false fault but a very real one.baten wrote:yes i agree data should be safe, but the equipment the disks are plugged into shouldnt just display false faults.
Well a TS-412 is the entry-level 4-bay model with a 1.2 GHz ARM CPU and a very modest 256 MB RAM. The whole system is specified as consuming only 26 Watts, with the disks alone probably using at least half of that. No performance miracles can be expected from such low specifications. Qnap currently have a bunch higher specified 4-bay models that all would have been better if great performance is important to you.this qnap is far too slow...
Okay, I understand that you posted with good intention but pulling a disk that is in an active rebuild is always a very bad thing, no matter how you look at it.my message above was to help other people maybe remove the error...
I agree. I expect 3-5 years out of my disks and most good disks give you that. Out of my 6 Hitachi HDS722020ALA330, 2 have now around the 3 year mark started to have read/write-errors and reallocated sectors. Unfortunately the problems never became severe enough inside of the warranty time. They are now retired to less important duty in test and desktop-computers, where I will squeeze that last lifetime out of them.not everyone has money to keep buying new disks every 2 months.
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