Linux Software RAID Bitmap Question

[Justin Piszcz]

Anyone have a good explanation for the use of bitmaps?

Anyone on the list use them?

http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID#Data_Scrubbing

Provides an explanation on that page.

I believe Neil stated that using bitmaps does incur a 10% performance 
penalty.  If one's box never (or rarely) crashes, is a bitmap needed?

The one question I had regarding a bitmap is as follows:

The mismatch_cnt file.

If I have bitmaps turned on for my RAID DEVICES, is it possible that the 
'mismatch_cnt' will be updated when it finds a bad block?

That would be VERY nice instead of running a check all the time.

Justin.
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