Does NFS cient I/O count iowait% on linux?

Solution In Progress - Updated -

Issue

When we use nfs mount and some datas are written on the NFS point, Is the iowait for nfs included in %iowait of sar?

# sar -u
Linux 2.6.32-431.el6.x86_64 (xxx.redhat.com)    2016年08月24日     _x86_64_    (1 CPU)

00時00分01秒     CPU     %user     %nice   %system   %iowait    %steal     %idle
00時10分01秒     all      0.01      0.00      0.01      0.02      0.12     99.84
00時20分01秒     all      0.00      0.00      0.00      0.04      0.09     99.86
00時30分01秒     all      0.01      0.00      0.01      0.01      0.09     99.88
00時40分01秒     all      0.00      0.00      0.01      0.01      0.11     99.87
00時50分01秒     all      0.01      0.00      0.01      0.01      0.10     99.88
:

Environment

Red Hat Enterprise Linux 6

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