On Fri, May 9, 2008 at 1:08 AM, Mike Snitzer [off-list ref] wrote:

On Fri, May 9, 2008 at 12:42 AM, Mike Snitzer [off-list ref] wrote:

 >  Was I supposed to use this latest patch in combination with your
 >  previous patch (to validate_super)?  Because you'll note that with
 >  your most recent patch nbd0's events (ev1) is still one less than
 >  sdq's events_cleared.  As such the validate_super's "ev1 <
 >  mddev->bitmap->events_cleared" check triggers a full rebuild.
 >
 >  The kernel log shows:
 >  md: md0 stopped.
 >  md: bind<nbd0>
 >  md: bind<sdq>
 >  md: kicking non-fresh nbd0 from array!
 >  md: unbind<nbd0>
 >  md: export_rdev(nbd0)
 >  raid1: raid set md0 active with 1 out of 2 mirrors
 >  md0: bitmap initialized from disk: read 13/13 pages, set 0 bits, status: 0

 Also, no bits were set in the bitmap.. bitmap_create() must've thrown
 away the dirty bits.  Given your latest patch, does bitmap_create()'s
 "bitmap->events_cleared == mddev->events" check need to be adjusted?

 Before I would always see something like:
 md0: bitmap initialized from disk: read 13/13 pages, set 1 bits, status: 0

Actually, the mdadm -X output I provided shows that sdq's bitmap
doesn't have any bits set:
Bitmap : 409600 bits (chunks), 0 dirty (0.0%)

This can't be right, considering nbd0 was marked faulty and the array
became degraded, can it?