Raid 6 & URE question

[ToTheMax]

I've been trying to research how raid 6 functions in regards to raid 6 during a drive failure and encountering a URE (unrecoverable read error)

If we assume the following;
- 12TB drive array
- Using WD red drives with a manufacture stated 10^14 URE rate, this will give a 100% chance of encountering a URE while the array is being rebuilt
- Raid 5 will typically stop a rebuild if it encounters a URE loosing all data
- Raid 6 has 2 parity drives so can deal with 2 drive failures
- A URE isn't a dead disk, just a sector that cannot be read

My question is will a rebuilding raid 6 array with a failed disk fail another disk when it encounters a URE or will it continue without failing the disk?

Thxs.

 

[ToTheMax]

Thanks for the very useful info. Specifically I was weighing up whether a 6 * 6TB disk raid 6 setup was worthwhile with drives stated at a 10^14 URE rate. If I go by the manufacturers stated URE rate I would see multiple URE events in the event of a rebuild (1 failed disk).

I might just go with a raid 10 setup which avoids the rebuild issues parity setups have.