Bug#549660: md raid1 + lvm2 + snapshot resulted in lvm2 hang

[Phil Ten]

Thank you for your post.

I assume it won't change your opinion on this 
problem. But just to correct my post. I made
an incorrect statement. When the problem 
occured the application was copying from the 
snapshot to the vmbackup volume. Therefore 
the 1GB was read from the snapshot, and not 
writen to the snapshot as I said previously.

To my knowledge it seem impossible that 
the snapshot was full. Plus, I always thought 
that a full snapshot was automatically disabled,
but the file system would remain usable.

In this case, no report in the log, and the complete 
lvm2 group volume became NOT usable (read/write hang). 
Including the second volume not involved in the snapshot.

I can't believe that a full snapshot would affect other 
lvm2 volumes, but I guess it maybe possible ????

Thanks anyway.

Phil Ten