b column in vmstat includes NFS?

Francisco Reyes lists at stringsutils.com
Mon Apr 17 17:11:13 UTC 2006

The 'b' column of vmstat shows pending transactions that require disk I/O. 
Does that include NFS connections?

Have a machine with very high numbers in that column, yet when I do top and 
select 'm' to show disk activity, the numbers in top are fairly small.

Wondering if the issue is the communication with the NFS servers. 

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