Re: Postgresql data integrity during RAID10 drive rebuild

On Nov 29, 2006, at 2:39 PM, Scott Marlowe wrote:

>> Sounds good. According to LSI, the drive will take 8 hrs to rebuild a
>> 146GB disc (at a 30% rebuild rate), so doing this in the middle of
>> the
>> day is not ideal.
>
> The rebuild time also tends to depend on how full the array is.  If
> you're only using 5% or so, it won't take the full 8 hours they're
> projecting.

But how does the RAID card know what is and what is not "full" in the
unix file system stored on it? It has to rebuild the entire drive.