Re: Raid 5 - not clean and then a failure.

Ryan Wagoner [off-list ref] writes:

Wouldn't weekly RAID consistency checks reveal a bad block before you
had a failure that required the need to do a full resync? It only
takes 3 hours to resync my 3 x 1TB drives and having a bitmap would
reduce the performance. I've never had to have a resync in the year
I've had the array up. I just wonder if the performance drawback is
worth having the bitmap to save a possible resync once every couple
years. Or are the RAID consistency checks not reliable enough to
prevent more errors during a resync?

Ryan

Bitmaps don't protect against disk failures. They help with
intermittent failures, usualy caused by the controler. If you don't
have intermittent failures then bitmaps will only cost you for no
benefit.

MfG
        Goswin