Column sar d blocks per second
Source sar -d 15 4
Description
The total number of disk block operations per second. This number indicates how busy the server is reading or writing blocks of data.
Caveats

srtdate_sar-d: 20041027094209      JST "sar -d 15 4"
4 runs of sar-d.  Total active disk drives= 26 Total blocks/second= 54
enddate_sar-d: 20041027094209   JST

This data is created from this command
% sar -d 15 4

SunOS tqdev 5.9 Generic_117171-02 sun4u    10/26/2004

18:46:35   device        %busy   avque   r+w/s  blks/s  avwait  avserv

18:46:36   nfs1              0     0.0       0       0     0.0     0.0
           nfs2              0     0.0       0       0     0.0     0.0
           sd2               0     0.0      10       0     0.0     0.0
           sd2,a             0     0.0       0       0     0.0     0.0
           sd2,b             0     0.0      12       0     0.0     0.0
           sd2,c             0     0.0       0       0     0.0     0.0
           sd3               0     0.0       0       0     0.0     0.0
           sd3,b             0     0.0       0       0     0.0     0.0