nw 6.5 sp 6

I started getting this error and did a pool rebuild

when it was at 42% it had an error that said make sure you can see all the arrays or

something like that.
If you continue you will lose 146 meg of data

I told it to continue because it was only doing 20% an hour.
After the error it never wrote any more blocks.
The total space is 500 gig.
All the data was ok after it finished.
I have not had this error again.

Can you tell me if I need to re-run this or what should I do?