Solaris kstat sdX disk nread counter value decreasing

Posted by mykhal on Server Fault See other posts from Server Fault or by mykhal
Published on 2009-12-21T10:25:57Z Indexed on 2011/06/21 0:23 UTC
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solaris

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I get strange disk io nread (bytes read) counter values (from kstat) on Solaris. Example of collected nread value for sd6 disk collected in 30s interval (command kstat -n sd6):

One would suppose that the relative read bytes count can't be negative.. I wonder what can couse this situation and whether there is more reliable disk io data available.

Some info about the system:

machine:~ # uname -a
SunOS machine 5.10 Generic_127112-11 i86pc i386 i86pc
machine:~ # cat /etc/release 
                        Solaris 10 11/06 s10x_u3wos_10 X86
           Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                           Assembled 14 November 2006

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